# Environmental Laws: Summaries of Major Statutes Administered by the Environmental Protection Agency

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URL: https://www.frixlaw.com/law-library/documents/crs%3ARL30798

## Record

- **Collection:** Congressional research report
- **Document type:** CRS Report
- **Published:** December 20, 2013
- **Citation:** RL30798

## Text

Environmental Laws: Summaries
of Major Statutes Administered by
the Environmental Protection Agency
(name redacted), Coordinator
Specialist in Environmental Policy
(name redacted)
Specialist in Resources and Environmental Policy
(name redacted)
Analyst in Environmental Policy
(name redacted)
Specialist in Environmental Policy
(name redacted)
Specialist in Environmental Policy
(name redacted)
Specialist in Environmental Policy
(name redacted)
Analyst in Environmental Policy
December 20, 2013
Congressional Research Service
7-....
www.crs.gov
RL30798

Environmental Laws: Summaries of Major Statutes Administered by EPA

Summary
With congressional approval, the Nixon Administration established the Environmental Protection
Agency (EPA) in 1970 under an executive branch reorganization plan, which consolidated
numerous federal pollution control responsibilities that had been divided among several federal
agencies. EPA’s responsibilities grew over time as Congress enacted an increasing number of
environmental statutes and major amendments to these statutes. EPA’s primary responsibilities
have evolved to include the regulation of air quality, water quality, and chemicals in commerce;
the development of regulatory criteria for the management and disposal of solid and hazardous
wastes; and the cleanup of environmental contamination. The implementation and enforcement of
many of these federal authorities is delegated to the states. EPA also provides financial assistance
to states and local governments to aid them in administering pollution control programs and in
complying with certain federal environmental requirements. Several federal statutes provide the
legal authority for EPA’s programs and activities. The major provisions of each of the following
statutes are summarized in this report, as laid out in existing law as of this writing.
The Clean Air Act (CAA) authorizes EPA to set mobile source limits, ambient air quality
standards, hazardous air pollutant emission standards, standards for new pollution sources, and
significant deterioration requirements; to identify areas that do not attain federal ambient air
quality standards set under the act; to administer a cap-and-trade program to reduce acid rain; and
to phase out substances that deplete the Earth’s stratospheric ozone layer.
The Clean Water Act (CWA) authorizes the regulation and enforcement of requirements that
govern waste discharges into U.S. waters, and financial assistance for wastewater treatment plant
construction and improvements. The Ocean Dumping Act focuses on the regulation of the
intentional disposal of materials into ocean waters and authorizes related research. The Safe
Drinking Water Act (SDWA) authorizes EPA to establish primary drinking water standards,
regulate underground injection disposal practices, and administer a groundwater control program.
The Solid Waste Disposal Act and Resource Conservation and Recovery Act (RCRA) govern
the regulation of solid and hazardous wastes, and corrective actions to address improper waste
management practices. The Comprehensive Environmental Response, Compensation, and
Liability Act (CERCLA) focuses on the cleanup of contamination resulting from the past release
of hazardous substances, but excludes petroleum which primarily is covered under the Oil
Pollution Act. Amendments to the Solid Waste Disposal Act specifically address the cleanup of
petroleum leaked from underground storage tanks that are not covered under CERCLA.
The Toxic Substances Control Act (TSCA) and the Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA) require regulation of commercial chemicals to reduce risks to human
health and the environment. The Pollution Prevention Act (PPA) authorizes various mechanisms
intended to prevent pollution by reducing the generation of pollutants at the point of origin. The
Emergency Planning and Community Right-to-Know Act (EPCRA) requires industrial
reporting of toxic releases and encourages chemical emergency response planning.
Under these and other statutes, Congress has assigned EPA the administration of a considerable
body of law and associated programs and activities. This report is not comprehensive in terms of
summarizing all laws administered by EPA, but covers the major, basic statutory authorities
underlying the agency’s programs and activities, and those which EPA has delegated to the states.

Congressional Research Service

Environmental Laws: Summaries of Major Statutes Administered by EPA

Contents
Introduction...................................................................................................................................... 1
Clean Air Act ................................................................................................................................... 3
Background................................................................................................................................ 3
National Ambient Air Quality Standards ................................................................................... 5
State Implementation Plans ....................................................................................................... 5
Nonattainment Requirements .................................................................................................... 6
Requirements for Ozone Nonattainment Areas ................................................................... 7
Requirements for Carbon Monoxide Nonattainment Areas ................................................ 8
Requirements for Particulate Nonattainment Areas ............................................................ 9
Transported Air Pollution .......................................................................................................... 9
Emission Standards for Mobile Sources .................................................................................. 10
Hazardous Air Pollutants ......................................................................................................... 12
New Source Performance Standards ....................................................................................... 13
Solid Waste Incinerators .......................................................................................................... 14
Prevention of Significant Deterioration / Regional Haze ........................................................ 14
Acid Deposition Control.......................................................................................................... 15
Permits ..................................................................................................................................... 16
Enforcement ............................................................................................................................ 17
Stratospheric Ozone Protection ............................................................................................... 17
Clean Water Act ............................................................................................................................. 25
Background.............................................................................................................................. 25
Federal and State Responsibilities ........................................................................................... 28
Titles II and VI—Municipal Wastewater Treatment Construction .......................................... 28
Permits, Regulations, and Enforcement .................................................................................. 29
Ocean Dumping Act ...................................................................................................................... 34
Background.............................................................................................................................. 34
Regulating Ocean Dumping .................................................................................................... 35
Enforcement ............................................................................................................................ 36
Research and Coastal Water Quality Monitoring .................................................................... 37
Safe Drinking Water Act ................................................................................................................ 39
Background.............................................................................................................................. 39
National Drinking Water Regulations...................................................................................... 41
Contaminant Selection and Regulatory Schedules ............................................................ 41
Standard Setting ................................................................................................................ 41
Risk Assessment ................................................................................................................ 42
Variances and Exemptions ................................................................................................ 42
State Primacy ........................................................................................................................... 42
Enforcement, Consumer Information, and Citizen Suits ......................................................... 43
Consumer Information and Reports .................................................................................. 43
Citizen Suits ...................................................................................................................... 43
Compliance Improvement Programs ....................................................................................... 43
Ground Water Protection Programs ......................................................................................... 44
Source Water Assessment and Protection Programs................................................................ 44
State Revolving Funds ............................................................................................................. 45
Drinking Water Security .......................................................................................................... 45
Vulnerability Assessments................................................................................................. 45

Congressional Research Service

Environmental Laws: Summaries of Major Statutes Administered by EPA

Emergency Powers ............................................................................................................ 46
Tampering with Public Water Systems.............................................................................. 46
Emergency Assistance ....................................................................................................... 46
Other Selected Provisions........................................................................................................ 47
Lead-Free Plumbing .......................................................................................................... 47
Research, Technical Assistance, and Training ......................................................................... 47
Demonstration Grants .............................................................................................................. 48
Records, Inspections, and Monitoring ..................................................................................... 48
National Drinking Water Advisory Council ............................................................................ 48
Federal Agencies ..................................................................................................................... 48
Assistance to Colonias ............................................................................................................. 49
Estrogenic Substances ............................................................................................................. 49
Drinking Water Studies............................................................................................................ 49
Solid Waste Disposal Act/Resource Conservation and Recovery Act ........................................... 52
Background.............................................................................................................................. 52
Waste Management Requirements .......................................................................................... 53
Hazardous Waste Management Requirements .................................................................. 53
Solid Waste Management Requirements ........................................................................... 55
Citizen Suits and Imminent Hazard Provisions ....................................................................... 56
Underground Storage Tanks .................................................................................................... 57
Promoting Recycling ............................................................................................................... 58
Amendments to RCRA ............................................................................................................ 59
Solid Waste Disposal Act Amendments of 1980 ............................................................... 59
The Used Oil Recycling Act of 1989 ................................................................................ 60
Hazardous and Solid Waste Amendments of 1984............................................................ 61
Federal Facility Compliance Act of 1992.......................................................................... 61
1996 Amendments ............................................................................................................. 62
Hazardous Waste Electronic Manifest Establishment Act ................................................ 62
Additional Selected Laws Affecting Solid Waste Management .............................................. 62
Sanitary Food Transportation Act ..................................................................................... 62
Clean Air Act ..................................................................................................................... 62
Pollution Prevention Act ................................................................................................... 63
Indian Lands Open Dump Cleanup Act ............................................................................ 63
Mercury-Containing and Rechargeable Battery Management Act.................................... 63
Comprehensive Environmental Response, Compensation, and Liability Act ............................... 67
Major Amendments ................................................................................................................. 68
Federal Response Authorities .................................................................................................. 71
Petroleum Exclusion and Related Oil Pollution Act Authorities....................................... 72
Other Exclusions ............................................................................................................... 72
Limitations on Response Actions ...................................................................................... 72
Prioritization of Response Actions .................................................................................... 72
Scope of Response Actions ............................................................................................... 73
Federal-State Cost Sharing ................................................................................................ 74
Selection of Response Actions ................................................................................................ 75
Cleanup Standards ............................................................................................................. 75
State Participation ............................................................................................................. 76
Public Participation ........................................................................................................... 76
Agency for Toxic Substances and Disease Registry................................................................ 77
Financial Liability ................................................................................................................... 77

Congressional Research Service

Environmental Laws: Summaries of Major Statutes Administered by EPA

Categories of Potentially Responsible Parties ................................................................... 77
Reach of Liability .............................................................................................................. 78
Defenses to Liability ......................................................................................................... 79
Limitations on Liability..................................................................................................... 79
Hazardous Substance Superfund Trust Fund ........................................................................... 80
Original Taxing Authority ................................................................................................. 80
Current Source of Revenues .............................................................................................. 81
Enforcement Mechanisms ....................................................................................................... 81
Federal Facilities ..................................................................................................................... 82
National Security Exemption................................................................................................... 83
Brownfields Properties ............................................................................................................ 84
Emergency Planning and Community Right-to-Know Act ........................................................... 88
Subtitle A—Emergency Planning and Notification ................................................................. 88
Subtitle B—Reporting Requirements ...................................................................................... 89
Subtitle C—General Provisions............................................................................................... 91
Trade Secrets ..................................................................................................................... 91
Information for Health Professionals ................................................................................ 91
Right to Know ................................................................................................................... 91
Enforcement ...................................................................................................................... 91
Chemical Transport ........................................................................................................... 91
Other Provisions ................................................................................................................ 91
Pollution Prevention Act of 1990................................................................................................... 93
Background.............................................................................................................................. 93
Provisions ................................................................................................................................ 93
Toxic Substances Control Act ........................................................................................................ 96
Background.............................................................................................................................. 97
Title I ....................................................................................................................................... 97
Testing of Chemicals ......................................................................................................... 98
Pre-manufacture Notification for New Chemicals or Uses ............................................... 98
Regulatory Controls for Hazardous Chemicals ................................................................. 99
Information Gathering ..................................................................................................... 100
Imminent Hazards ........................................................................................................... 100
Relation to Other Laws ................................................................................................... 101
Enforcement and Judicial Review ................................................................................... 101
Confidential Business Information.................................................................................. 101
Chemical Categories ....................................................................................................... 101
State Preemption ............................................................................................................. 102
Other Provisions .............................................................................................................. 102
Title II (Asbestos in Buildings) ............................................................................................. 103
Title III (Radon Programs) .................................................................................................... 103
Title IV (Lead Exposure Reduction) ..................................................................................... 104
Title V (Reducing Risks in Schools) ..................................................................................... 106
Title VI (Limiting Formaldehyde Emissions) ....................................................................... 107
Pesticide Laws ............................................................................................................................. 110
History of Federal Pesticide Law .......................................................................................... 111
FIFRA ............................................................................................................................. 111
FFDCA ............................................................................................................................ 114
Registration of Pesticide Products ......................................................................................... 115
Tolerance Setting ................................................................................................................... 117

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Public Disclosure, Exclusive Use, and Trade Secrets............................................................ 118
Reregistration ........................................................................................................................ 119
Registration Review .............................................................................................................. 120
Special Review ...................................................................................................................... 120
Canceling or Suspending a Registration ................................................................................ 120
Use of Unregistered Pesticides .............................................................................................. 121
Enforcement .......................................................................................................................... 121
Export of Unregistered Pesticides ......................................................................................... 121
National Environmental Policy Act ............................................................................................. 124
The NEPA Process ................................................................................................................. 125
Environmental Protection Agency Functions Under NEPA .................................................. 126

Tables
Table 1. Clean Air Act and Amendments ......................................................................................... 4
Table 2. Statutory Ozone Nonattainment Classifications ................................................................ 6
Table 3. Current Ozone Nonattainment Classifications ................................................................... 7
Table 4. Major U.S. Code Sections of the Clean Air Act, as Amended ......................................... 19
Table 5. Clean Water Act and Major Amendments ........................................................................ 25
Table 6. Major U.S. Code Sections of the Clean Water Act, as Amended ..................................... 31
Table 7. Ocean Dumping Act and Amendments ............................................................................ 34
Table 8. Major U.S. Code Sections of the Ocean Dumping Act, as Amended .............................. 38
Table 9. Safe Drinking Water Act and Amendments ..................................................................... 40
Table 10. Major U.S. Code Sections of the Safe Drinking Water Act, as Amended (Title
XIV of the Public Health Service Act) ....................................................................................... 50
Table 11. Solid Waste Disposal Act/Resource Conservation and Recovery Act and Major
Amendments ............................................................................................................................... 52
Table 12. Major U.S. Code Sections of the Solid Waste Disposal Act/ Resource
Conservation and Recovery Act (RCRA) ................................................................................... 63
Table 13. Comprehensive Environmental Response, Compensation, and Liability Act
(CERCLA) and Major Amendments .......................................................................................... 70
Table 14. Major U.S. Code Sections of the Comprehensive Environmental Response,
Compensation, and Liability Act of 1980 (CERCLA), as Amended, and Related Acts ............ 85
Table 15. Major U.S. Code Sections of the Emergency Planning and Community Rightto-Know Act (EPCRA) ............................................................................................................... 92
Table 16. Major U.S. Code Sections of the Pollution Prevention Act ........................................... 95
Table 17. Toxic Substances Control Act and Major Amendments................................................. 97
Table 18. Major U.S. Code Sections of the Toxic Substances Control Act, as Amended ............ 108
Table 19. Federal Insecticide, Fungicide, and Rodenticide Act and Amendments ...................... 113
Table 20. Federal Food, Drug, and Cosmetic Act, Section 408, and Amendments .................... 114

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Table 21. Major U.S. Code Sections of the Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA), as Amended .................................................................................... 122
Table 22. Major U.S. Code Sections of the Federal Food, Drug, and Cosmetic Act
(FFDCA), as Amended, Related to Pesticides .......................................................................... 123
Table 23. National Environmental Policy Act, Amendments, and Related Acts ......................... 125
Table 24. Major U.S. Code Sections of the National Environmental Policy Act, as
Amended................................................................................................................................... 128

Contacts
Author Contact Information......................................................................................................... 129

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Introduction
The origin of the Environmental Protection Agency (EPA) is rooted in a reorganization of the
executive branch under the Nixon Administration. Reorganization Plan No. 3 of 1970 proposed
the establishment of EPA to integrate the administration of numerous federal pollution control
laws that had been carried out by several federal agencies. This plan was part of a broader effort
to reorganize an array of environmental responsibilities of many federal agencies, which also
resulted in the creation of the National Oceanic and Atmospheric Administration (NOAA).1 The
Nixon Administration created EPA and NOAA through this reorganization with congressional
approval under procedures established in the Reorganization Act of 1949, as amended.2
The Reorganization Act authorizes the President to propose reorganizations to Congress that
would promote the “better execution” of federal laws, the “more effective” management of
individual agencies and their functions, and the “efficiency of the operations of Government to
the fullest extent practicable.”3 President Nixon determined that the consolidation of federal
pollution control responsibilities under one agency was necessary to meet these statutory
objectives, and proposed a reorganization of the executive branch to establish EPA under
Reorganization Plan No. 3. The plan was based largely on recommendations of the “Ash
Council,” which President Nixon had formed to examine the organization of environmental
responsibilities among federal agencies. The 91st Congress approved this plan, leading to the
creation of EPA on December 2, 1970.4
Over time, EPA’s authorities have grown as Congress has enacted an increasing number of
environmental statutes and major amendments to these statutes. EPA’s primary responsibilities
have evolved to include the regulation of air quality, water quality, and chemicals in commerce;
the development of regulatory criteria for the management and disposal of solid and hazardous
wastes; and the cleanup of environmental contamination. Although EPA sets uniform pollution
control standards and regulations on a national level, the implementation and enforcement of
many of these federal standards and regulations are delegated to the states. EPA also provides
financial assistance in the form of grants to states and local governments to aid them in
administering pollution control programs and in complying with certain federal environmental
requirements. The states also have enacted their own pollution control authorities and programs,
which complement the federal role of EPA in protecting human health and the environment.
This report presents a summary of the body of federal environmental statutes that together
constitute the main authorities of EPA, but this report is not comprehensive in terms of discussing
all federal statutes that may authorize certain activities of the agency.5 This report highlights
prominent provisions of the selected statutes discussed herein, characterizes the purpose and
scope of major programs and activities authorized in each statute, and explains the definitions of
key statutory terms that establish the parameters of the agency’s authorities in these instances.
1

Reorganization Plan No. 4 addressed the establishment of NOAA.
5 U.S.C. §901 et seq.
3
5 U.S.C. §901(a).
4
Approval of executive branch reorganization plans under the Reorganization Act of 1949, as amended, is subject to
congressional approval through a resolution process outlined at 5 U.S.C. §906.
5
For example, the National Environmental Education Act of 1990 (P.L. 101-619) authorized EPA to award grants to
elementary and secondary schools to support environmental education.
2

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Although Congress somewhat recently has renewed the authorization of appropriations for certain
EPA programs and activities through targeted amendments to various statutes, a more
comprehensive reauthorization of many of the statutes that EPA administers has not been enacted
for a number of years. Even though the authorization of appropriations may expire, program
authority (often referred to as an agency’s “enabling” authority) generally does not expire unless
repealed, or unless there is a “sunset” date for the program authority itself. If the authorization of
appropriations for a specific program or activity has expired, Congress still may provide funding
through the annual appropriations process to continue that program or activity, if certain rules for
floor consideration are not enforced or are waived.
House and Senate rules generally do not allow the appropriation of funding for a program or
activity that Congress has not authorized in law, but these rules are subject to points of order and
are not self-enforcing. Congress therefore may appropriate funding for a specific program or
activity for which the authorization of appropriations has expired, if no Member raises a point of
order, or the rules are waived for consideration of a particular bill. Congress typically has done so
to continue the appropriation of funding for EPA programs and activities for which the
authorization of appropriations has expired. Once enacted, appropriations provide the legal
authority for an agency to obligate federal funds in that particular fiscal year.6 Congress
appropriates funding for EPA within the Interior, Environment, and Related Agencies annual
appropriations bill.7 (For a discussion of enacted funding for FY2013, see CRS Report R43207,
Environmental Protection Agency (EPA): Appropriations for FY2013 in P.L. 113-6, by (name r
edacted) and (name redacted).)
This report focuses primarily on EPA’s program authorities under the statutes discussed herein. A
list of major amendments to the parent statute is provided at the beginning of each summary. The
final table at the end of each summary lists the individual provisions of the statute, crossreferencing the sections of the public laws to the sections of the United States Code where each
provision is codified. The summaries in this report outline the major provisions of each statute,
but are not comprehensive in terms of discussing every provision of these statutes in their
entirety. For the purpose of brevity, the summaries omit certain details and secondary provisions
that would necessitate a lengthier examination. Furthermore, some prominent provisions are only
briefly mentioned, which are beyond the scope of the summaries provided herein.
Moreover, this report provides an analytical summary of the major provisions of the statutes as
laid out in existing law as of this writing. This report does not examine issues associated with
their implementation or with regulations that EPA may have proposed or promulgated to carry out
these statutes. Other CRS reports offer information on current developments and issues associated
with the implementation of various statutory authorities of EPA and the agency’s regulatory role
under these statutes, many of which are cited in this report where relevant to the discussion.

6

For a discussion of these and other budgetary procedures, see CRS Report 98-721, Introduction to the Federal Budget
Process, coordinated by (name redacted)
7
During the 109th Congress, EPA’s funding was moved from the jurisdiction of the House and Senate Appropriations
Subcommittees on Veterans Affairs, Housing and Urban Development, and Independent Agencies to the Interior,
Environment, and Related Agencies Appropriations Subcommittees, beginning with the FY2006 appropriations. This
change resulted from the abolition of the House and Senate Appropriations Subcommittees on Veterans Affairs,
Housing and Urban Development, and Independent Agencies. This subcommittee jurisdiction was transferred among
the remaining subcommittees of the House and Senate Committees on Appropriations.

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Clean Air Act8
The Clean Air Act, codified as 42 U.S.C. 7401 et seq., seeks to protect human health and the
environment from emissions that pollute ambient, or outdoor, air. It requires the Environmental
Protection Agency to establish minimum national standards for air quality, and assigns primary
responsibility to the states to assure compliance with the standards. Areas not meeting the
standards, referred to as “nonattainment areas,” are required to implement specified air pollution
control measures. The act establishes federal standards for mobile sources of air pollution and
their fuels and for sources of 187 hazardous air pollutants, and it establishes a cap-and-trade
program for the emissions that cause acid rain. It establishes a comprehensive permit system for
all major sources of air pollution. It also addresses the prevention of pollution in areas with clean
air and protection of the stratospheric ozone layer.

Background
Like many other programs administered by the Environmental Protection Agency, federal efforts
to control air pollution have gone through several phases, beginning with information collection,
research, and technical assistance, before being strengthened to establish federal standards and
enforcement. Federal legislation addressing air pollution was first passed in 1955, prior to which
air pollution was the exclusive responsibility of state and local levels of government.
The federal role was strengthened in subsequent amendments, notably the Clean Air Act
Amendments of 1970, 1977, and 1990. The 1970 amendments established the procedures under
which EPA sets national standards for ambient air quality, required a 90% reduction in emissions
from new automobiles by 1975, established a program to require the best available control
technology at major new sources of air pollution, established a program to regulate air toxics, and
greatly strengthened federal enforcement authority. The 1977 amendments adjusted the auto
emission standards, extended deadlines for the attainment of ambient air quality standards, and
added the Prevention of Significant Deterioration program to protect air cleaner than national
standards.
Changes to the act in 1990 included provisions to (1) classify most nonattainment areas according
to the extent to which they exceed the standard, tailoring deadlines, planning, and controls to each
area’s status; (2) tighten auto and other mobile source emission standards; (3) require
reformulated and alternative fuels in the most polluted areas; (4) revise the air toxics section,
establishing a new program of technology-based standards and addressing the problem of sudden,
catastrophic releases of air toxics; (5) establish an acid rain control program, with a marketable
allowance scheme to provide flexibility in implementation; (6) require a state-run permit program
for the operation of major sources of air pollutants; (7) implement the Montreal Protocol to phase
out most ozone-depleting chemicals; and (8) update the enforcement provisions so that they
parallel those in other pollution control acts, including authority for EPA to assess administrative
penalties.

8

Prepared by (name redacted) and (name redacted), Specialists in the Resources, Science, and Industry Division.

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Environmental Laws: Summaries of Major Statutes Administered by EPA

Table 1. Clean Air Act and Amendments
(codified generally as 42 U.S.C. 7401-7671)
Year

Act

Public Law Number

1955

Air Pollution Control Act

P.L. 84-159

1959

Reauthorization

P.L. 86-353

1960

Motor vehicle exhaust study

P.L. 86-493

1963

Clean Air Act Amendments

P.L. 88-206

1965

Motor Vehicle Air Pollution Control Act

1966

Clean Air Act Amendments of 1966

P.L. 89-675

1967

Air Quality Act of 1967
National Air Emission Standards Act

P.L. 90-148

1970

Clean Air Act Amendments of 1970

P.L. 91-604

1973

Reauthorization

P.L. 93-15

1974

Energy Supply and Environmental Coordination Act of 1974

P.L. 93-319

1977

Clean Air Act Amendments of 1977

P.L. 95-95

1980

Acid Precipitation Act of 1980

1981

Steel Industry Compliance Extension Act of 1981

P.L. 97-23

1987

Clean Air Act 8-month Extension

P.L. 100-202

1990

Clean Air Act Amendments of 1990

P.L. 101-549

1991

Technical correction to list of hazardous air pollutants

P.L. 102-187

1995-96

Relatively minor laws amending the act

P.L. 104-6, P.L. 104-59, P.L. 104-70, P.L.
104-260

1998

Amended Section 604 re methyl bromide

P.L. 105-277, Section 764

1998

Border Smog Reduction Act of 1998

P.L. 105-286

1999

Chemical Safety Information, Site Security and Fuels Regulatory
Relief Act

P.L. 106-40

2004

Amendments to §209 re small engines

2005

Energy Policy Act of 2005 (amended §211 re fuels)

P.L. 109-58

2007

Energy Independence and Security Act of 2007 (amended
§211 re fuels)

P.L. 110-140

P.L. 89-272, Title I

P.L. 96-294, Title VII

P.L. 108-199, Division G, Title IV,
Section 428

The 1990 amendments also authorized appropriations for clean air programs through FY1998.
The act has not been reauthorized since then. House rules require enactment of an authorization
before an appropriation bill can be considered; but this requirement can be waived and frequently
has been. Thus, while authorization of appropriations in the Clean Air Act (and most other
environmental statutes) has expired, programs have continued and have been funded. The act’s
other legal authorities, to issue and enforce regulations, are, for the most part, permanent and are
not affected by the lack of authorization.
The remainder of this report describes major programs required by the act, with an emphasis on
the changes established by the 1990 amendments.

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Environmental Laws: Summaries of Major Statutes Administered by EPA

National Ambient Air Quality Standards
In Section 109, the act requires EPA to establish National Ambient Air Quality Standards
(NAAQS) for air pollutants that endanger public health or welfare, in the Administrator’s
judgment, and whose presence in ambient air results from numerous or diverse sources. The
NAAQS must be designed to protect public health with an adequate margin of safety and to
protect the public welfare from any known or anticipated adverse effects. Using this authority,
EPA has promulgated NAAQS for six air pollutants: sulfur dioxide (SO2), particulate matter
(PM2.5 and PM10), nitrogen dioxide (NO2), carbon monoxide (CO), ozone,9 and lead. The act
requires EPA to review the scientific data upon which the standards are based, and revise the
standards, if necessary. More often than not, EPA has taken more than five years in reviewing and
revising the standards, but the establishment of a deadline has allowed interested parties to force
review of the standards by filing suit.
Originally, the act required that the NAAQS be attained by 1977 at the latest, but the states
experienced widespread difficulty in complying with this deadline. As a result, the deadlines for
achieving NAAQS have been extended several times. Under the 1990 amendments, most areas
not in attainment with NAAQS must meet special compliance schedules, staggered according to
the severity of an area’s air pollution problem. The amendments also established specific
requirements for each nonattainment category, as described below.

State Implementation Plans
While the act authorizes EPA to set NAAQS, the states are responsible for establishing
procedures to attain and maintain the standards. Under Section 110 of the act, the states adopt
plans, known as State Implementation Plans (SIPs), and submit them to EPA to ensure that they
are adequate to meet statutory requirements.
SIPs are based on emission inventories and computer models to determine whether air quality
violations will occur. If these data show that standards would be exceeded, the state must impose
additional controls on existing sources to ensure that emissions do not cause “exceedances” of the
standards. Proposed new and modified sources must obtain state construction permits in which
the applicant shows how the anticipated emissions will not exceed allowable limits. In
nonattainment areas, emissions from new or modified sources must also be offset by reductions in
emissions from existing sources.
The 1990 amendments require EPA to impose sanctions in areas which fail to submit a SIP, fail to
submit an adequate SIP, or fail to implement a SIP: unless the state corrects such failures, a 2-to-1
emissions offset for the construction of new polluting sources is imposed 18 months after
notification to the state, and a ban on most new federal highway grants is imposed six months
later. An additional ban on air quality grants is discretionary. Ultimately, a Federal
Implementation Plan may be imposed if the state fails to submit or implement an adequate SIP.
The amendments also require that, in nonattainment areas, no federal permits or financial
assistance may be granted for activities that do not “conform” to a State Implementation Plan.
9
Unlike the other NAAQS pollutants, ozone is not directly emitted, but rather is formed in the atmosphere by the
interaction of volatile organic compounds (VOCs) and nitrogen oxides (NOx) in the presence of sunlight. The control
of ozone is, thus, based on regulating emissions of VOCs and NOx.

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Environmental Laws: Summaries of Major Statutes Administered by EPA

This requirement can cause a temporary suspension in funding for most new highway and transit
projects if an area fails to demonstrate that the emissions caused by such projects are consistent
with attainment and maintenance of ambient air quality standards. Demonstrating conformity of
transportation plans and SIPs is required in nonattainment areas whenever new plans are
submitted.

Nonattainment Requirements
In a major departure from the prior law, the 1990 Clean Air Act Amendments grouped most
nonattainment areas into classifications based on the extent to which the NAAQS was exceeded,
and established specific pollution controls and attainment dates for each classification. These
requirements are described here as specified in Sections 181-193 of the act.10
Nonattainment areas are classified on the basis of a “design value,” which is derived from the
pollutant concentration (in parts per million or micrograms per cubic meter) recorded by air
quality monitoring devices. The design value for the 1-hour ozone standard was the fourth highest
hourly reading measured during the most recent three-year period. Using these design values, the
act created five classes of ozone nonattainment, as shown in Table 2. Only Los Angeles fell into
the “extreme” class, but 97 other areas were classified in one of the other four ozone categories. A
simpler classification system established moderate and serious nonattainment areas for carbon
monoxide and particulate matter with correspondingly more stringent control requirements for the
more polluted class.
Table 2. Statutory Ozone Nonattainment Classifications
Class

Marginal

Moderate

Serious

Severe

Extreme

Deadline

1993

1996

1999

2005-2007a

2010

Areasb

42 areas
0.121 ppm0.138 ppm

32 areas
0.138 ppm0.160 ppm

14 areas
0.160 ppm0.180 ppm

9 areas
0.180 ppm0.280 ppm

1 area

Design
Value

>0.280 ppm

a.

Areas with a 1988 design value between 0.190 and 0.280 ppm were given 17 years to attain; others had 15
years.

b.

Number of areas in each category as of the date of enactment.

As shown in Table 2, the statutory attainment deadlines for ozone nonattainment areas stretched
from 1993 to 2010, depending on the severity of the problem. Under the current eight-hour ozone
standard, shown in Table 3, these deadlines are changed to 2015 to 2032.

10

EPA modified the ozone standard, specified in the statute as 0.12 parts per million (ppm) averaged over a 1-hour
period, to 0.08 ppm averaged over an 8-hour period, through regulations promulgated in July 1997. In April 2004, the
agency promulgated an implementation rule for the new 8-hour standard. Under this rule, the 1-hour standard was
revoked as of June 15, 2005, and areas that had not yet attained it were converted to new classifications depending on
their 8-hour concentration of ozone. In general the former 1-hour nonattainment areas remain subject to the controls
specified for their 1-hour category. The standard was revised again in March 2008, to 0.075 ppm averaged over 8
hours. Nonattainment areas for the 2008 standard were designated following its promulgation.

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Table 3. Current Ozone Nonattainment Classifications
Class

Marginal

Moderate

Serious

Severe

Extreme

Deadline

2015

2018

2021

2027-2029a

2032

Areasb

36 areas
0.076 ppm0.086 ppm

3 areas
0.086 ppm0.100 ppm

2 areas
0.100 ppm0.113 ppm

3 areas
0.113 ppm0.175 ppm

2 areas

Design
Value

>0.175 ppm

a.

Areas with a design value between 0.119 and 0.175 ppm have 17 years to attain; others have 15 years.

b.

Number of areas in each category as of the date of designation (May 2012).

Requirements for Ozone Nonattainment Areas
Although areas with more severe air pollution problems have a longer time to meet the standards,
more stringent control requirements are imposed in areas with worse pollution. A summary of the
primary ozone control requirements for each nonattainment category follows.
Marginal Areas
•

Inventory emissions sources (to be updated every three years).

•

Require 1.1 to 1 offsets (i.e., new major emission sources of volatile organic
compounds [VOCs] must reduce VOC emissions from existing facilities in the
area by 10% more than the emissions of the new facility).

•

Impose reasonably available control technology (RACT) on all major sources
emitting more than 100 tons per year for the nine industrial categories where EPA
had already issued control technique guidelines describing RACT prior to 1990.

Moderate Areas
•

Meet all requirements for marginal areas.

•

Impose a 15% reduction in VOC emissions in six years.

•

Adopt a basic vehicle inspection and maintenance program.

•

Impose RACT on all major sources emitting more than 100 tons per year for all
additional industrial categories where EPA will issue control technique guidelines
describing RACT.

•

Require vapor recovery at gas stations selling more than 10,000 gallons per
month.

•

Require 1.15 to 1 offsets.

Serious Areas
•

Meet all requirements for moderate areas.

•

Reduce definition of a major source of VOCs from emissions of 100 tons per
year to 50 tons per year for the purpose of imposing RACT.

•

Reduce VOCs 3% annually for years 7 to 9 after the 15% reduction already
required by year 6.

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•

Improve monitoring.

•

Adopt an enhanced vehicle inspection and maintenance program.

•

Require fleet vehicles to use clean alternative fuels.

•

Adopt transportation control measures if the number of vehicle miles traveled in
the area is greater than expected.

•

Require 1.2 to 1 offsets.

•

Adopt contingency measures if the area does not meet required VOC reductions.

Severe Areas
•

Meet all requirements for serious areas.

•

Reduce definition of a major source of VOCs from emissions of 50 tons per year
to 25 tons per year for the purpose of imposing RACT.

•

Adopt specified transportation control measures.

•

Implement a reformulated gasoline program.

•

Require 1.3 to 1 offsets.

•

Impose $5,000 per ton penalties on major sources if the area does not meet
required reductions.

Extreme Areas
•

Meet all requirements for severe areas.

•

Reduce definition of a major source of VOCs from emissions of 25 tons per year
to 10 tons per year for the purpose of imposing RACT.

•

Require clean fuels or advanced control technology for boilers emitting more
than 25 tons per year of NOx.

•

Require 1.5 to 1 offsets.

As noted, EPA promulgated a new, 8-hour ozone standard in July 1997. Following extensive court
challenges, the agency designated nonattainment areas for the new standard on April 30, 2004.
State Implementation Plans were required to be submitted in 2007.

Requirements for Carbon Monoxide Nonattainment Areas
As with ozone nonattainment areas, carbon monoxide (CO) nonattainment areas are subjected to
specified control requirements, with more stringent requirements in Serious nonattainment areas.
A summary of the primary CO control requirements for each nonattainment category follows.
Moderate Areas
•

Conduct an inventory of emissions sources.

•

Forecast total vehicle miles traveled in the area.

•

Adopt an enhanced vehicle inspection and maintenance program.

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•

Demonstrate annual improvements sufficient to attain the standard.

Serious Areas
•

Adopt specified transportation control measures.

•

Implement an oxygenated fuels program for all vehicles in the area.

•

Reduce definition of a major source of CO from emissions of 100 tons per year
to 50 tons per year if stationary sources contribute significantly to the CO
problem.

Serious areas failing to attain the standard by the deadline have to revise their SIP and
demonstrate reductions of 5% per year until the standard is attained. All areas have now attained
the standard.

Requirements for Particulate Nonattainment Areas
Particulate (PM10) nonattainment areas are also subject to specified control requirements. These
are:
Moderate Areas
•

Require permits for new and modified major stationary sources of PM10.

•

Impose reasonably available control measures (RACM).

Serious Areas
•

Impose best available control measures (BACM).

•

Reduce definition of a major source of PM10 from 100 tons per year to 70 tons
per year.

In July 1997, EPA promulgated new standards for fine particulates (PM2.5). The PM2.5 standards
were also subject to court challenges. The absence of a monitoring network capable of measuring
the pollutant delayed implementation as well. Nonattainment areas for PM2.5 were designated on
April 14, 2005. States had three years subsequent to designation to submit State Implementation
Plans. Revisions to the NAAQS promulgated in October 2006 strengthened the PM2.5 standard.

Transported Air Pollution
Meeting the nation’s clean air standards can be complicated, as air pollution is no respecter of
political boundaries or subdivisions. This problem of transported air pollutants has come into
particular focus as states and EPA attempt to develop effective compliance strategies to achieve
both the ozone and the PM2.5 NAAQS. Under Section 110(a)(2)(D), SIPs must include adequate
provisions to prevent sources within that state from contributing significantly to nonattainment in
one or more downwind states.
If EPA finds a SIP inadequate to achieve a NAAQS, it must require the affected state to submit a
revised SIP that includes sufficient measures to bring that state into compliance. This is known as
a “SIP Call.” The 1990 Clean Air Act amendments provided EPA and the states with new tools to
address the transport problem through this provision. One of those tools is Section 176A, a

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provision that permits EPA, either on its own or by petition from any state, to establish a transport
region to address regional pollution problems contributing to violations of a primary NAAQS. A
commission of EPA and state officials is constituted to make recommendations to EPA on
appropriate mitigation strategies. Based on the commission’s findings and recommendations, EPA
is then required under Section 110(k)(5) to notify affected states of inadequacies in their current
state implementation plans and to establish deadlines (not to exceed 18 months) for submitting
necessary revisions (i.e., a SIP call). Besides authorizing administratively created transport
regions, the 1990 amendments statutorily created an Ozone Transport Region (OTR) in the
Northeast. This provision (Section 184 of the act) required specific additional controls for all
areas (not only nonattainment areas) in that region, and established the Ozone Transport
Commission for the purpose of recommending to EPA regionwide controls affecting all areas in
the region.
The transport issue may also be addressed by affected downwind states through a Section 126
petition. As amended by the 1990 Clean Air Act amendments, under Section 126(b) any state or
political subdivision may petition EPA for a finding that a major source or group of stationary
sources located in another state is emitting pollutants that “significantly contribute” to the
nonattainment of a NAAQS by their state. EPA is to respond to the petition within 60 days. If the
petition is granted, the offending sources must cease operations within three months unless the
sources comply with emission controls and the compliance schedules as determined by EPA to
bring them into compliance with the section. Section 126 has rarely been used, although it has
proven useful to EPA in some cases as backup authority where there might be challenges to a SIP
call.

Emission Standards for Mobile Sources
Title II of the Clean Air Act has required emission standards for automobiles since 1968. The
1990 amendments significantly tightened these standards: for cars, the hydrocarbon standard was
reduced by 40% and the nitrogen oxides (NOx) standard by 50%. These standards—referred to as
“Tier 1” standards—were phased in over the 1994-1996 model years.
The amendments envisioned a further set of reductions (“Tier 2” standards), but not before model
year 2004. For Tier 2 standards to be promulgated, the agency was first required to report to
Congress concerning the need for further emission reductions, the availability of technology to
achieve such reductions, and the cost-effectiveness of such controls compared to other means of
attaining air quality standards. EPA submitted this report to Congress in August 1998, concluding
that further emission reductions were needed and that technology to achieve such reductions was
available and cost-effective. Tier 2 standards, requiring emission reductions of 77% to 95% from
cars and light trucks were promulgated in February 2000, and were phased in over the 2004-2009
model years. To facilitate the use of more effective emission controls, the standards also require a
more than 90% reduction in the sulfur content of gasoline, beginning in 2004.
The 1990 amendments also required that oxygenated gasoline, designed to reduce emissions of
carbon monoxide, be sold in the worst CO nonattainment areas and that “reformulated” gasoline
(RFG), designed to reduce emissions of volatile organic compounds and toxic air pollutants, be
sold in the nine worst ozone nonattainment areas (Los Angeles, San Diego, Houston, Baltimore,
Philadelphia, New York, Hartford, Chicago, and Milwaukee); metropolitan Washington, DC, and
four areas in California were added to the mandatory list later. Other ozone nonattainment areas
can opt in to the RFG program; as of 2006, additional areas in 11 states had done so.

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The fuels provisions were modified by the Energy Policy Act of 2005 (EPACT), removing the
requirement that RFG contain oxygenates. Instead, EPACT required the use of increasing
amounts of renewable fuel, most likely to be ethanol, in motor fuels, beginning in 2006. The
Energy Independence and Security Act of 2007 further strengthened the renewable fuel
requirements.
Use of alternative fuels and development of cleaner engines was also to be stimulated by the
Clean-Fuel Fleet Program. In all of the most seriously polluted ozone and CO nonattainment
areas, centrally fueled fleets of 10 or more passenger cars and light-duty trucks must purchase at
least 30% clean-fuel vehicles when they add new vehicles to existing fleets, starting in 1999. (The
act originally required the program to begin in 1998, but the start was delayed by a year.) The
percentage rose to 50% in 2000 and 70% in 2001. Heavy-duty fleets are required to purchase at
least 50% clean-fuel vehicles annually. A clean fuel vehicle is one which meets Low Emission
Vehicle (LEV) standards and operates on reformulated gasoline, reformulated diesel, methanol,
ethanol, natural gas, liquefied petroleum gas, hydrogen, or electricity.
In addition to the above program, California’s Zero Emission Vehicle (ZEV) program also is
intended to promote the development of alternative fuels and vehicles. Section 209(b) of the
Clean Air Act allows the EPA Administrator to grant California the authority to develop its own
vehicle emissions standards if those standards are at least as stringent as the federal standards and
if the state demonstrates that it needs the standards to meet compelling and extraordinary
conditions. In addition to setting more stringent standards for all vehicles, California used this
authority to establish a program requiring auto manufacturers to sell ZEVs (electric or hydrogen
fuel cell vehicles) in the state beginning in 2003. This program has been substantially modified
since it was enacted, and now allows credit for hybrid and partial ZEV vehicles in addition to true
ZEVs, but it has served as an incubator for lower emission technologies since its adoption.
Section 177 of the act allows other states to adopt California’s stricter standards: at least 10 states
(Connecticut, Maine, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode
Island, Vermont, and Washington) have already adopted them or are in the process of doing so.
The 1990 amendments also imposed tighter requirements on certification (an auto’s useful life is
defined as 100,000 miles instead of the earlier 50,000 miles), on emissions allowed during
refueling, on low temperature CO emissions, on in-use performance over time, and on warranties
for the most expensive emission control components (8 years/80,000 miles for the catalytic
converter, electronic emissions control unit, and onboard emissions diagnostic unit). Regulations
were also extended to include nonroad fuels and engines.
Standards for trucks and buses using diesel engines were also strengthened. The 1990
amendments required new urban buses to reduce emissions of diesel particulates 92% by 1996,
and all other heavy-duty diesel engines to achieve an 83% reduction by the same year. NOx
emissions must also be reduced, 33% by 1998. Authority to further strengthen these standards led
to promulgation in January 2001 of new emission standards requiring a further 90%-95%
reduction in emissions phased in over the 2007-2010 model years, and a reduction of 97% in the
allowable amount of sulfur in highway diesel fuel. These regulations were followed in May 2004
by similar requirements for nonroad diesel equipment, which are being phased in between 2007
and 2015.

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Hazardous Air Pollutants
Completely rewritten by the Clean Air Act Amendments of 1990, Section 112 of the act
establishes programs for protecting public health and the environment from exposure to toxic air
pollutants. As revised by the 1990 amendments, the section contains four major provisions:
Maximum Achievable Control Technology (MACT) requirements; health-based standards;
standards for stationary “area sources” (small, but numerous sources, such as gas stations or dry
cleaners, that collectively emit significant quantities of hazardous pollutants); and requirements
for the prevention of catastrophic releases.
First, EPA is to establish technology-based emission standards, called MACT standards, for
sources of 187 pollutants listed in the legislation, and to specify categories of sources subject to
the emission standards.11 EPA is to revise the standards periodically (at least every eight years).
EPA can, on its own initiative or in response to a petition, add or delete substances or source
categories from the lists.
Section 112 establishes a presumption in favor of regulation for the designated chemicals; it
requires regulation of a designated pollutant unless EPA or a petitioner is able to show “that there
is adequate data on the health and environmental effects of the substance to determine that
emissions, ambient concentrations, bioaccumulation or deposition of the substance may not
reasonably be anticipated to cause any adverse effects to human health or adverse environmental
effects.”
EPA is required to set standards for sources of the listed pollutants that achieve “the maximum
degree of reduction in emissions” taking into account cost and other non-air-quality factors.
These MACT standards for new sources “shall not be less stringent than the most stringent
emissions level that is achieved in practice by the best controlled similar source.” The standards
for existing sources may be less stringent than those for new sources, but must be no less
stringent than the emission limitations achieved by either the best performing 12% of existing
sources (if there are more than 30 such sources in the category or subcategory) or the best
performing 5 similar sources (if there are fewer than 30). Existing sources are given three years
following promulgation of standards to achieve compliance, with a possible one-year extension;
additional extensions may be available for special circumstances or for certain categories of
sources. Existing sources that achieve voluntary early emissions reductions will receive a six-year
extension for compliance with MACT.
The second major provision of Section 112 directs EPA to set health-based standards to address
situations in which a significant residual risk of adverse health effects or a threat of adverse
environmental effects remains after installation of MACT. This provision requires that EPA, after
consultation with the Surgeon General of the United States, submit a report to Congress on the
public health significance of residual risks, and recommend legislation regarding such risks. If
Congress does not legislate in response to EPA’s recommendations, then EPA is required to issue
standards for categories of sources of hazardous air pollutants as necessary to protect the public
health with an ample margin of safety or to prevent an adverse environmental effect. A residual
risk standard is required for any source emitting a cancer-causing pollutant that poses an added
11
The 1990 amendments specified 189 pollutants, but P.L. 102-187, enacted on December 4, 1991, deleted hydrogen
sulfide from the list of toxic pollutants, leaving only 188. On December 19, 2005, EPA removed methyl ethyl ketone
(MEK) from the list of toxic air pollutants. The total number of listed air toxics is now 187.

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risk to the most exposed person of more than one-in-a-million. Residual risk standards are due
eight years after promulgation of MACT for the affected source category. Existing sources have
90 days to comply with a residual risk standard, with a possible two-year extension. In general,
residual risk standards do not apply to area sources.
The law directed EPA to contract with the National Academy of Sciences (NAS) for a study of
risk assessment methodology, and created a Risk Assessment and Management Commission to
investigate and report on policy implications and appropriate uses of risk assessment and risk
management. In 1994 NAS published its report, Science and Judgment in Risk Assessment. The
Commission study, Framework for Environmental Health Risk Management, was released in
1997.
Third, in addition to the technology-based and health-based programs for major sources of
hazardous air pollution, EPA is to establish standards for stationary “area sources” determined to
present a threat of adverse effects to human health or the environment. The provision requires
EPA to regulate the stationary area sources responsible for 90% of the emissions of the 30
hazardous air pollutants that present the greatest risk to public health in the largest number of
urban areas. In setting the standard, EPA can impose less stringent “generally available” control
technologies, rather than MACT.
Finally, Section 112 addresses prevention of sudden, catastrophic releases of air toxics by
establishing an independent Chemical Safety and Hazard Investigation Board. The Board is
responsible for investigating accidents involving releases of hazardous substances, conducting
studies, and preparing reports on the handling of toxic materials and measures to reduce the risk
of accidents.
EPA is also directed to issue prevention, detection, and correction requirements for catastrophic
releases of air toxics by major sources. Section 112(r) requires owners and operators to prepare
risk management plans including hazard assessments, measures to prevent releases, and a
response program.

New Source Performance Standards
Section 111 of the act requires EPA to establish nationally uniform, technology-based standards
(called New Source Performance Standards, or NSPS) for categories of new industrial facilities.
These standards accomplish two goals: first, they establish a consistent baseline for pollution
control that competing firms must meet, and thereby remove any incentive for states or
communities to weaken air pollution standards in order to attract polluting industry; and second,
they preserve clean air to accommodate future growth, as well as for its own benefits.
NSPS establish maximum emission levels for new major stationary sources—powerplants, steel
mills, and smelters, for example—with the emission levels determined by the best “adequately
demonstrated” continuous control technology available, taking costs into account. EPA must
regularly revise and update NSPS applicable to designated sources as new technology becomes
available, since the goal is to prevent new pollution problems from developing and to force the
installation of new control technology.
The standards also apply to modifications of existing facilities, through a process called New
Source Review (NSR). The law’s ambiguity regarding what constitutes a modification (subject to

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NSR) as opposed to routine maintenance of a facility has led to litigation, with EPA proposing in
recent years to modify its interpretation of the requirements of this section.

Solid Waste Incinerators
Prior to 1990, solid waste incinerators, which emit a wide range of pollutants, were subject to
varying degrees of state and federal regulation depending on their size, age, and the type of waste
burned. In a new Section 129, the 1990 amendments established more consistent federal
requirements specifying that emissions of 10 categories of pollutants be regulated at new and
existing incinerators burning municipal solid waste, medical waste, and commercial and
industrial waste. The amendments also established emissions monitoring and operator training
requirements.

Prevention of Significant Deterioration / Regional Haze
Sections 160-169 of the act establish requirements for the prevention of significant deterioration
of air quality (PSD). The PSD program reflects the principle that areas where air quality is better
than that required by NAAQS should be protected from significant new air pollution even if
NAAQS would not be violated.
The act divides clean air areas into three classes, and specifies the increments of SO2 and
particulate pollution allowed in each. Class I areas include international and national parks,
wilderness and other pristine areas; allowable increments of new pollution are very small. Class II
areas include all attainment and not classifiable areas, not designated as Class I; allowable
increments of new pollution are modest. Class III represents selected areas that states may
designate for development; allowable increments of new pollution are large (but not so large that
the area would exceed NAAQS). Through an elaborate hearing and review process, a state can
have regions redesignated from Class II to Class III (although none have yet been so
redesignated).
While the 1977 amendments only stipulated PSD standards for two pollutants, SO2 and
particulates, EPA is supposed to establish standards for other criteria pollutants. Thus far, only
one of the other four (NO2) has been addressed: the agency promulgated standards for NO2 in
1988.
Newly constructed polluting sources in PSD areas must install best available control technology
(BACT) that may be stricter than that required by NSPS. The justifications of the policy are that it
protects air quality, provides an added margin of health protection, preserves clean air for future
development, and prevents firms from gaining a competitive edge by “shopping” for clean air to
pollute.
In Sections 169A and B, the act also sets a national goal of preventing and remedying impairment
of visibility in national parks and wilderness areas, and requires EPA to promulgate regulations to
assure reasonable progress toward that goal. In the 1990 Amendments, Congress strengthened
these provisions, which had not been implemented.
The amendments required EPA to establish a Grand Canyon Visibility Transport Commission,
composed of governors from each state in the affected region, an EPA designee, and a
representative of each of the national parks or wilderness areas in the region. Other visibility

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transport commissions can be established upon EPA’s discretion or upon petition from at least two
states. Within 18 months of receiving a report from one of these commissions, EPA is required to
promulgate regulations to assure reasonable progress toward the visibility goal, including
requirements that states update their State Implementation Plans to contain emission limits,
schedules of compliance, and other measures necessary to make reasonable progress. Specifically
mentioned is a requirement that states impose Best Available Retrofit Technology on existing
sources of emissions impairing visibility.
The Grand Canyon Commission delivered a set of recommendations to EPA in June 1996, and the
agency subsequently promulgated a “regional haze” program applicable to all 50 states under this
authority.

Acid Deposition Control
The Clean Air Act Amendments of 1990 added an acid deposition control program (Title IV) to
the act. It set goals for the year 2000 of reducing annual SO2 emissions by 10 million tons from
1980 levels and reducing annual NOx emissions by 2 million tons, also from 1980 levels.
The SO2 reductions were imposed in two steps. Under Phase 1, owners/operators of 111 electric
generating facilities listed in the law that are larger than 100 megawatts had to meet tonnage
emission limitations by January 1, 1995. This would reduce SO2 emissions by about 3.5 million
tons. Phase 2 included facilities larger than 75 megawatts, with a deadline of January 1, 2000.
Compliance has been 100%.
To introduce some flexibility in the distribution and timing of reductions, the act creates a
comprehensive permit and emissions allowance system. An allowance is a limited authorization
to emit a ton of SO2. Issued by EPA, the allowances would be allocated to Phase 1 and Phase 2
units in accordance with baseline emissions estimates. Powerplants which commence operation
after November 15, 1990, would not receive any allowances. These new units would have to
obtain allowances (offsets) from holders of existing allowances. Allowances may be traded
nationally during either phase. The law also permitted industrial sources and powerplants to sell
allowances to utility systems under regulations developed by EPA. Allowances may be banked by
a utility for future use or sale.
The act provided for two types of sales to improve the liquidity of the allowance system and to
ensure the availability of allowances for utilities and independent power producers who need
them. First, a special reserve fund consisting of 2.8% of Phase 1 and Phase 2 allowance
allocations has been set aside for sale. Allowances from this fund (25,000 annually from 19931999 and 50,000 thereafter) are sold at a fixed price of $1,500 an allowance. Independent power
producers have guaranteed rights to these allowances under certain conditions. Second, an annual,
open auction sold allowances (150,000 from 1993-1995, and 250,000 from 1996-1999) with no
minimum price. Utilities with excess allowances may have them auctioned off at this auction, and
any person may buy allowances.
The act essentially caps SO2 emissions at individual existing sources through a tonnage
limitation, and at future plants through the allowance system. First, emissions from most existing
sources are capped at a specified emission rate times an historic baseline level. Second, for plants
commencing operation after November 15, 1990, emissions must be completely offset with
additional reductions at existing facilities beginning after Phase 2 compliance. However, as noted

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above, the law provides some allowances to future powerplants which meet certain criteria. The
utility SO2 emission cap was set at 8.9 million tons, with some exceptions.
The act provides that if an affected unit does not have sufficient allowances to cover its
emissions, it is subject to an excess emission penalty of $2,000 per ton of SO2 and required to
reduce an additional ton of SO2 the next year for each ton of excess pollutant emitted.
The act also requires EPA to inventory industrial emissions of SO2 and to report every five years,
beginning in 1995. If the inventory shows that industrial emissions may reach levels above 5.60
million tons per year, then EPA is to take action under the act to ensure that the 5.60 million ton
cap is not exceeded.
The act requires EPA to set specific NOx emission rate limitations—0.45 lb. per million Btu for
tangentially-fired boilers and 0.50 lb. per million Btu for wall-fired boilers—unless those rates
cannot be achieved by low-NOx burner technology. Tangentially and wall-fired boilers affected by
Phase 1 SO2 controls must also meet NOx requirements. EPA was to set emission limitations for
other types of boilers by 1997 based on low-NOx burner costs, which EPA did. In addition, EPA
was to propose and promulgate a revised new source performance standard for NOx from fossil
fuel steam generating units, which EPA also did, in 1998.
Since 2005, EPA has used the authority described above in the section on “Transported Air
Pollution” to further reduce the caps on SO2 and NOx emissions in the eastern half of the country.
As a result, SO2 and NOx emissions have been reduced by a further 50% since 2005.

Permits
The Clean Air Act Amendments of 1990 added a Title V to the act which requires states to
administer a comprehensive permit program for the operation of sources emitting air pollutants.
These requirements are modeled after similar provisions in the Clean Water Act. Previously, the
Clean Air Act contained limited provision for permits, requiring only new or modified major
stationary sources to obtain construction permits (under Section 165 of the act).
Sources subject to the permit requirements generally include major sources that emit or have the
potential to emit 100 tons per year of any regulated pollutant, plus stationary and area sources that
emit or have potential to emit lesser specified amounts of hazardous air pollutants. However, in
nonattainment areas, the permit requirements also include sources which emit as little as 50, 25,
or 10 tons per year of VOCs, depending on the severity of the region’s nonattainment status
(serious, severe, or extreme).
States were required to develop permit programs and to submit those programs for EPA approval
by November 15, 1993. EPA had one year to approve or disapprove a state’s submission in whole
or in part. After the effective date of a state plan, sources had 12 months to submit an actual
permit application.
States are to collect annual fees from sources sufficient to cover the “reasonable costs” of
administering the permit program, with revenues to be used to support the agency’s air pollution
control program. The fee must be at least $25 per ton of regulated pollutants (excluding carbon
monoxide). Permitting authorities have discretion not to collect fees on emissions in excess of
4,000 tons per year and may collect other fee amounts, if appropriate.

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The permit states how much of which air pollutants a source is allowed to emit. As a part of the
permit process, a source must prepare a compliance plan and certify compliance. The term of
permits is limited to no more than five years; sources are required to renew permits at that time.
State permit authorities must notify contiguous states of permit applications that may affect them;
the application and any comments of contiguous states must be forwarded to EPA for review. EPA
can veto a permit; however, this authority is essentially limited to major permit changes. EPA
review need not include permits which simply codify elements of a state’s overall clean air plan,
and EPA has discretion to not review permits for small sources. Holding a permit to some extent
shields a source from enforcement actions: the act provides that a source cannot be held in
violation if it is complying with explicit requirements addressed in a permit, or if the state finds
that certain provisions do not apply to that source.

Enforcement
Section 113 of the act, which was also strengthened by the 1990 amendments, covers
enforcement. The section establishes federal authority to issue agency and court orders requiring
compliance and to impose penalties for violations of act requirements. Section 114 authorizes
EPA to require sources to submit reports, monitor emissions, and certify compliance with the act’s
requirements, and authorizes EPA personnel to conduct inspections.
Like most federal environmental statutes, the Clean Air Act is enforced primarily by states or
local governments; they issue most permits, monitor compliance, and conduct the majority of
inspections. The federal government functions as a backstop, with authority to review state
actions. The agency may act independently or may file its own enforcement action in cases where
it concludes that a state’s response was inadequate.
The act also provides for citizen suits both against persons (including corporations or government
agencies) alleged to have violated emissions standards or permit requirements, and against EPA in
cases where the Administrator has failed to perform an action that is not discretionary under the
act. Citizen groups have often used the latter provision to compel the Administrator to promulgate
regulations required by the statute.
The 1990 Amendments elevated penalties for some knowing violations from misdemeanors to
felonies; removed the ability of a source to avoid an enforcement order or civil penalty by ceasing
a violation within 60 days of notice; gave authority to EPA to assess administrative penalties; and
authorized $10,000 awards to persons supplying information leading to convictions under the act.

Stratospheric Ozone Protection
Title VI of the 1990 Clean Air Act Amendments represents the United States’ primary response on
the domestic front to the ozone depletion issue. It also implements the U.S. international
responsibilities under the Montreal Protocol on Substances that Deplete the Ozone Layer (and its
amendments). Indeed, Section 606(a)(3) provides that the Environmental Protection Agency shall
adjust phase-out schedules for ozone-depleting substances in accordance with any future changes
in Montreal Protocol schedules. As a result, the phase-out schedules contained in Title VI for
various ozone-depleting compounds have now been superseded by subsequent amendments to the
Montreal Protocol.

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Since passage of Title VI, depleting substances such as CFCs, methyl chloroform, carbon
tetrachloride, and halons (referred to as Class 1 substances) have been phased out by industrial
countries, including the United States. New uses of hydrochlorofluorocarbons (HCFCs) (called
Class 2 substances under Title VI) are banned beginning January 1, 2015, unless the HCFCs are
recycled, used as a feedstock, or used as a refrigerant for appliances manufactured prior to
January 1, 2020. Production of HCFCs is to be frozen January 1, 2015, and phased out by January
1, 2030. Exemptions consistent with the Montreal Protocol are allowed.
EPA is required to add any substance with an ozone depletion potential (ODP) of 0.2 or greater to
the list of Class 1 substances and set a phase-out schedule of no more than seven years. For
example, methyl bromide (ODP estimated by EPA at 0.7) was added to the list in December 1993,
requiring its phaseout by January 1, 2001; this decision was altered by Congress in 1998 to
harmonize the U.S. methyl bromide phase-out schedule with the 2005 deadline set by the parties
to the Montreal Protocol in 1997. Also, EPA is required to add any substance that is known or
may be reasonably anticipated to harm the stratosphere to the list of Class 2 substances and set a
phase-out schedule of no more than 10 years.
Title VI contains several implementing strategies to avoid releases of ozone-depleting chemicals
to the atmosphere, including (1) for Class 1 substances used as refrigerants—lowest achievable
level of use and emissions, maximum recycling, and safe disposal required by July 1, 1992; (2)
for servicing or disposing refrigeration equipment containing Class 1 and 2 substances—venting
banned as of July 1, 1992; (3) for motor vehicle air conditioners containing Class 1 or 2
substances—recycling required by January 1, 1992 (smaller shops by January 1, 1993); (4) sale of
small containers of class 1 and 2 substances—banned within two years of enactment; and (5)
nonessential products—banned within two years of enactment.

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Table 4. Major U.S. Code Sections of the Clean Air Act, as Amended
(codified generally at 42 U.S.C. 7401-7671q)
42 U.S.C.

Section Title

Clean Air Act, as
Amended

Chapter 85—Air Pollution Prevention And Control
Subchapter I—Programs and Activities
Part A—Air Quality and Emission Limitations
7401

Congressional findings and declaration of purpose

Sec. 101

7402

Cooperative activities

Sec. 102

7403

Research, investigation, training, and other activities

Sec. 103

7404

Research relating to fuels and vehicles

Sec. 104

7405

Grants for support of air pollution planning and control programs

Sec. 105

7406

Interstate air quality agencies; program cost limitations

Sec. 106

7407

Air quality control regions

Sec. 107

7408

Air quality criteria and control techniques

Sec. 108

7409

National primary and secondary ambient air quality standards

Sec. 109

7410

State implementation plans for national primary and secondary
ambient air quality standards

Sec. 110

7411

Standards of performance for new stationary sources

Sec. 111

7412

Hazardous air pollutants

Sec. 112

7413

Federal enforcement

Sec. 113

7414

Recordkeeping, inspections, monitoring, and entry

Sec. 114

7415

International air pollution

Sec. 115

7416

Retention of state authority

Sec. 116

7417

Advisory committees

Sec. 117

7418

Control of pollution from federal facilities

Sec. 118

7419

Primary nonferrous smelter orders

Sec. 119

7420

Noncompliance penalty

Sec. 120

7421

Consultation

Sec. 121

7422

Listing of certain unregulated pollutants

Sec. 122

7423

Stack heights

Sec. 123

7424

Assurance of adequacy of state plans

Sec. 124

7425

Measures to prevent economic disruption or unemployment

Sec. 125

7426

Interstate pollution abatement

Sec. 126

7427

Public notification

Sec. 127

7428

State boards

Sec. 128

7429

Solid waste combustion

Sec. 129

7430

Emission factors

Sec. 130

7431

Land use authority

Sec. 131

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42 U.S.C.

Section Title

Clean Air Act, as
Amended

Part B—Ozone Protection (Section 7450 to 7459 repealed—new provisions related to stratospheric ozone protection are
found at 42 U.S.C. 7671 et seq., under Subchapter VI below)
Part C—Prevention of Significant Deterioration of Air Quality
Subpart I—Clean Air
7470

Congressional declaration of purpose

Sec. 160

7471

Plan requirements

Sec. 161

7472

Initial classifications

Sec. 162

7473

Increments and ceilings

Sec. 163

7474

Area redesignation

Sec. 164

7475

Preconstruction requirements

Sec. 165

7476

Other pollutants

Sec. 166

7477

Enforcement

Sec. 167

7478

Period before plan approval

Sec. 168

7479

Definitions

Sec. 169

Subpart II—Visibility Protection
7491

Visibility protection for federal class I areas

Sec. 169A

7492

Visibility

Sec. 169B

Part D—Plan Requirements for Nonattainment Areas
Subpart I—Nonattainment Areas in General
7501

Definitions

Sec. 171

7502

Nonattainment plan provisions in general

Sec. 172

7503

Permit requirements

Sec. 173

7504

Planning procedures

Sec. 174

7505

Environmental Protection Agency grants

Sec. 175

7505a

Maintenance plans

Sec. 175A

7506

Limitations on certain federal assistance

Sec. 176

7506a

Interstate transport commissions

Sec. 176A

7507

New motor vehicle emission standards in nonattainment areas

Sec. 177

7508

Guidance documents

Sec. 178

7509

Sanctions and consequences of failure to attain

Sec. 179

7509a

International border areas

Sec. 179B

Subpart II—Additional Provisions for Ozone Nonattainment Areas
7511

Classifications and attainment dates

Sec. 181

7511a

Plan submissions and requirements

Sec. 182

7511b

Federal ozone measures

Sec. 183

7511c

Control of interstate ozone air pollution

Sec. 184

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Clean Air Act, as
Amended

42 U.S.C.

Section Title

7511d

Enforcement for Severe and Extreme ozone nonattainment areas for
failure to attain

Sec. 185

7511e

Transitional areas

Sec. 185A

7511f

NOx and VOC study

Sec. 185B

Subpart III—Additional Provisions for Carbon Monoxide Nonattainment Areas
7512

Classification and attainment dates

Sec. 186

7512a

Plan submissions and requirements

Sec. 187

Subpart IV—Additional Provisions for Particulate Matter Nonattainment Areas
7513

Classifications and attainment dates

Sec. 188

7513a

Plan provisions and schedules for plan submissions

Sec. 189

7513b

Issuance of RACM and BACM guidance

Sec. 190

Subpart V—Additional Provisions for Areas Designated Nonattainment for Sulfur Oxides, Nitrogen Dioxide, or Lead
7514

Plan submission deadlines

Sec. 191

7514a

Attainment dates

Sec. 192

Subpart VI—Savings Provisions
7515

General savings clause

Sec. 193

Subchapter II—Emission Standards for Moving Sources
Part A—Motor Vehicle Emission and Fuel Standards
7521

Emission standards for new motor vehicles or new motor vehicle
engines

Sec. 202

7522

Prohibited acts

Sec. 203

7523

Actions to restrain violations

Sec. 204

7524

Civil penalties

Sec. 205

7525

Motor vehicle and motor vehicle engine compliance testing and
certification

Sec. 206

7541

Compliance by vehicles and engines in actual use

Sec. 207

7542

Information collection

Sec. 208

7543

State standards

Sec. 209

7544

State grants

Sec. 210

7545

Regulation of fuels

Sec. 211

7546

Renewable Fuel

Sec. 212

7547

Nonroad engines and vehicles

Sec. 213

7548

Study of particulate emissions from motor vehicles

Sec. 214

7549

High altitude performance adjustments

Sec. 215

7550

Definitions

Sec. 216

7552

Motor vehicle compliance program fees

Sec. 217

7553

Prohibition on production of engines requiring leaded gasoline

Sec. 218

7554

Urban bus standards

Sec. 219

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42 U.S.C.

Section Title

Clean Air Act, as
Amended

Part B—Aircraft Emission Standards
7571

Establishment of standards

Sec. 231

7572

Enforcement of standards

Sec. 232

7573

State standards and controls

Sec. 233

7574

Definitions

Sec. 234

Part C—Clean Fuel Vehicles
7581

Definitions

Sec. 241

7582

Requirements applicable to clean-fuel vehicles

Sec. 242

7583

Standards for light-duty clean-fuel vehicles

Sec. 243

7584

Administration and enforcement as per California standards

Sec. 244

7585

Standards for heavy-duty clean-fuel vehicles (GVWR above 8,500 lbs.
up to 26,000 lbs.)

Sec. 245

7586

Centrally fueled fleets

Sec. 246

7587

Vehicle conversions

Sec. 247

7588

Federal agency fleets

Sec. 248

7589

California pilot test program

Sec. 249

7590

General provisions

Sec. 250

Subchapter III—General Provisions
7601

Administration

Sec. 301

7602

Definitions

Sec. 302

7603

Emergency powers

Sec. 303

7604

Citizen suits

Sec. 304

7605

Representation in litigation

Sec. 305

7606

Federal procurement

Sec. 306

7607

Administrative proceedings and judicial review

Sec. 307

7608

Mandatory licensing

Sec. 308

7609

Policy review

Sec. 309

7610

Other authority

Sec. 310

7611

Records and audit

Sec. 311

7612

Economic impact analyses

Sec. 312

7614

Labor standards

Sec. 314

7615

Separability

Sec. 315

7616

Sewage treatment grants

Sec. 316

7617

Economic impact assessment

Sec. 317

7619

Air quality monitoring

Sec. 319

7620

Standardized air quality modeling

Sec. 320

7621

Employment effects

Sec. 321

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42 U.S.C.

Section Title

Clean Air Act, as
Amended

7622

Employee protection

Sec. 322

7624

Cost of vapor recovery equipment

Sec. 323

7625

Vapor recovery for small business marketers of petroleum products

Sec. 324

7625-1

Exemptions for certain territories

Sec. 325

7625a

Statutory construction

Sec. 326

7626

Authorization of appropriations

Sec. 327

7627

Air pollution from Outer Continental Shelf activities

Sec. 328

Subchapter IV-A—Acid Deposition Control
7651

Findings and purposes

Sec. 401

7651a

Definitions

Sec. 402

7651b

Sulfur dioxide allowance program for existing and new units

Sec. 403

7651c

Phase I sulfur dioxide requirements

Sec. 404

7651d

Phase II sulfur dioxide requirements

Sec. 405

7651e

Allowances for states with emissions rates at or below 0.80
lbs/mmBtu

Sec. 406

7651f

Nitrogen oxides emission reduction program

Sec. 407

7651g

Permits and compliance plans

Sec. 408

7651h

Repowered sources

Sec. 409

7651i

Election for additional sources

Sec. 410

7651j

Excess emissions penalty

Sec. 411

7651k

Monitoring, reporting, and recordkeeping requirements

Sec. 412

7651l

General compliance with other provisions

Sec. 413

7651m

Enforcement

Sec. 414

7651n

Clean coal technology regulatory incentives

Sec. 415

7651o

Contingency guarantee, auctions, reserve

Sec. 416

Subchapter V—Permits
7661

Definitions

Sec. 501

7661a

Permit programs

Sec. 502

7661b

Permit applications

Sec. 503

7661c

Permit requirements and conditions

Sec. 504

7661d

Notification to Administrator and contiguous states

Sec. 505

7661e

Other authorities

Sec. 506

7661f

Small business stationary source technical and environmental
compliance assistance program

Sec. 507

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42 U.S.C.

Section Title

Clean Air Act, as
Amended

Subchapter VI—Stratospheric Ozone Protection
7671

Definitions

Sec. 601

7671a

Listing of class I and class II substances

Sec. 602

7671b

Monitoring and reporting requirements

Sec. 603

7671c

Phase-out of production and consumption of class I substances

Sec. 604

7671d

Phase-out of production and consumption of class II substances

Sec. 605

7671e

Accelerated schedule

Sec. 606

7671f

Exchange authority

Sec. 607

7671g

National recycling and emission reduction program

Sec. 608

7671h

Servicing of motor vehicle air conditioners

Sec. 609

7671i

Nonessential products containing chlorofluorocarbons

Sec. 610

7671j

Labeling

Sec. 611

7671k

Safe alternatives policy

Sec. 612

7671l

Federal procurement

Sec. 613

7671m

Relationship to other laws

Sec. 614

7671n

Authority of Administrator

Sec. 615

7671o

Transfers among parties to Montreal Protocol

Sec. 616

7671p

International cooperation

Sec. 617

7671q

Miscellaneous provisions

Sec. 618

[29 U.S.C. 655]

Chemical Process Safety Management

[29 U.S.C. 1662e]

Clean Air Employment Transition Assistance

Sec. 304 of CAA of 1990
Sec. 1101 of CAA of
1990

Note: This table shows only the major U.S. Code sections. For more detail and to determine when a section was
added, consult the official version of the U.S. Code.

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Clean Water Act12
The principal law governing pollution of the nation’s surface waters is the Federal Water
Pollution Control Act, or Clean Water Act. Originally enacted in 1948, it was totally revised by
amendments in 1972 that gave the act its current shape. The 1972 legislation spelled out
ambitious programs for water quality improvement that have since been expanded and are still
being implemented by industries and municipalities. Congress made certain fine-tuning
amendments in 1977, revised portions of the law in 1981, and enacted further amendments in
1987. Table 5 lists the original law and major amendments to it.
Table 5. Clean Water Act and Major Amendments
(codified generally at 33 U.S.C. §§1251-1387)
Year

Act

Public Law Number

1948

Federal Water Pollution Control Act

P.L. 80-845 (Act of June 30, 1948)

1956

Water Pollution Control Act of 1956

P.L. 84-660 (Act of July 9, 1956)

1961

Federal Water Pollution Control Act Amendments

P.L. 87-88

1965

Water Quality Act of 1965

P.L. 89-234

1966

Clean Water Restoration Act

P.L. 89-753

1970

Water Quality Improvement Act of 1970

1972

Federal Water Pollution Control Act Amendments

P.L. 92-500

1977

Clean Water Act of 1977

P.L. 95-217

1981

Municipal Wastewater Treatment Construction Grants Amendments

P.L. 97-117

1987

Water Quality Act of 1987

P.L. 100-4

P.L. 91-224, Part I

For a review of ongoing implementation of the act, see CRS Report R40098, Water Quality Issues
in the 111th Congress: Oversight and Implementation, by (name redacted).

Background
The Federal Water Pollution Control Act of 1948 was the first comprehensive statement of federal
interest in clean water programs, and it specifically provided state and local governments with
technical assistance funds to address water pollution problems, including research. Water
pollution was viewed as primarily a state and local problem, hence, there were no federally
required goals, objectives, limits, or even guidelines. When it came to enforcement, federal
involvement was strictly limited to matters involving interstate waters and only with the consent
of the state in which the pollution originated.
During the latter half of the 1950s and well into the 1960s, water pollution control programs were
shaped by four laws which amended the 1948 statute. They dealt largely with federal assistance to
municipal dischargers and with federal enforcement programs for all dischargers. During this
12

Prepared by (name redacted), Specialist in Resources and Environmental Policy, Environmental Policy Section,
Resources, Science, and Industry Division.

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period, the federal role and federal jurisdiction were gradually extended to include navigable
intrastate, as well as interstate, waters. Water quality standards became a feature of the law in
1965, requiring states to set standards for interstate waters that would be used to determine actual
pollution levels.
By the late 1960s, there was a widespread perception that existing enforcement procedures were
too time-consuming and that the water quality standards approach was flawed because of
difficulties in linking a particular discharger to violations of stream quality standards.
Additionally, there was mounting frustration over the slow pace of pollution cleanup efforts and a
suspicion that control technologies were being developed but not applied to the problems. These
perceptions and frustrations, along with increased public interest in environmental protection, set
the stage for the 1972 amendments.
The 1972 statute did not continue the basic components of previous laws as much as it set up new
ones. It set optimistic and ambitious goals, required all municipal and industrial wastewater to be
treated before being discharged into waterways, increased federal assistance for municipal
treatment plant construction, strengthened and streamlined enforcement, and expanded the federal
role while retaining the responsibility of states for day-to-day implementation of the law.
The 1972 legislation declared as its objective the restoration and maintenance of the chemical,
physical, and biological integrity of the nation’s waters. Two goals also were established: zero
discharge of pollutants by 1985 and, as an interim goal and where possible, water quality that is
both “fishable” and “swimmable” by mid-1983. While those dates have passed, the goals remain,
and efforts to attain the goals continue.
The Clean Water Act (CWA) today consists of two major parts, one being the Title II and Title VI
provisions which authorize federal financial assistance for municipal sewage treatment plant
construction. The other is regulatory requirements, found throughout the act, that apply to
industrial and municipal dischargers.
The act has been termed a technology-forcing statute because of the rigorous demands placed on
those who are regulated by it to achieve higher and higher levels of pollution abatement.
Industries were given until July 1, 1977, to install “best practicable control technology” (BPT) to
clean up waste discharges. Municipal wastewater treatment plants were required to meet an
equivalent goal, termed “secondary treatment,” by that date. (Municipalities unable to achieve
secondary treatment by that date were allowed to apply for case-by-case extensions up to July 1,
1988. According to EPA, 86% of all cities met the 1988 deadline; the remainder was put under
judicial or administrative schedules requiring compliance as soon as possible. However, many
cities, especially smaller ones, continue to make investments in building or upgrading facilities
needed to achieve secondary treatment.) Cities that discharge wastes into marine waters were
eligible for case-by-case waivers of the secondary treatment requirement, where sufficient
showing could be made that natural factors provide significant elimination of traditional forms of
pollution and that both balanced populations of fish, shellfish, and wildlife and water quality
standards would be protected.
The primary focus of BPT was on controlling discharges of conventional pollutants, such as
suspended solids, biochemical oxygen demanding material, fecal coliform and bacteria, and pH.
These pollutants are substances that are biodegradable (i.e., bacteria can break them down), occur
naturally in the aquatic environment, and deplete the dissolved oxygen concentration in water,
which is necessary for fish and other aquatic life.

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The act required greater pollutant cleanup than BPT by no later than March 31, 1989, generally
demanding that industry use the “best available technology” (BAT) that is economically
achievable. Compliance extensions of as long as two years are available for industrial sources
utilizing innovative or alternative technology. Failure to meet statutory deadlines could lead to
enforcement action.
The act utilizes both water quality standards and technology-based effluent limitations to protect
water quality. Technology-based effluent limitations are specific numerical limitations established
by EPA and placed on certain pollutants from certain sources. They are applied to industrial and
municipal sources through numerical effluent limitations in discharge permits. Water quality
standards are standards for the overall quality of water. They consist of the designated beneficial
use or uses of a waterbody (recreation, water supply, industrial, or other), plus a numerical or
narrative statement identifying maximum concentrations of various pollutants which would not
interfere with the designated use. The act requires each state to establish water quality standards
for all bodies of water in the state. These standards serve as the backup to federally set
technology-based requirements by indicating where additional pollutant controls are needed to
achieve the overall goals of the act. In waters where industrial and municipal sources have
achieved technology-based effluent limitations, yet water quality standards have not been met,
dischargers may be required to meet additional pollution control requirements. For each of these
waters, the act requires states to set a total maximum daily load (TMDL) of pollutants at a level
that ensures that applicable water quality standards can be attained and maintained. A TMDL is
both a planning process for attaining water quality standards and a quantitative assessment of
pollution problems, sources, and pollutant reductions needed to restore and protect a river, stream,
or lake. Based on state reports, EPA estimates that more than 40,000 U.S. waters are impaired and
require preparation of TMDLs.
Control of toxic pollutant discharges has been a key focus of water quality programs. In addition
to the BPT and BAT national standards, states are required to implement control strategies for
waters expected to remain polluted by toxic chemicals even after industrial dischargers have
installed the best available cleanup technologies required under the law. Development of
management programs for these post-BAT pollutant problems was a prominent element in the
1987 amendments and is a key continuing aspect of CWA implementation.
Prior to the 1987 amendments, programs in the Clean Water Act were primarily directed at pointsource pollution—wastes discharged from discrete and identifiable sources, such as pipes and
other outfalls. In contrast, except for general planning activities, little attention had been given to
nonpoint-source pollution (stormwater runoff from agricultural lands, forests, construction sites,
and urban areas), despite estimates that it represents more than 50% of the nation’s remaining
water pollution problems. As it travels across land surface towards rivers and streams, rainfall and
snowmelt runoff picks up pollutants, including sediments, toxic materials, and conventional
wastes (e.g., nutrients) that can degrade water quality.
The 1987 amendments authorized measures to address such pollution by directing states to
develop and implement nonpoint pollution management programs (Section 319 of the act). States
were encouraged to pursue groundwater protection activities as part of their overall nonpoint
pollution control efforts. Federal financial assistance was authorized to support demonstration
projects and actual control activities. These grants may cover up to 60% of program
implementation costs.

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While the act imposes great technological demands, it also recognizes the need for
comprehensive research on water quality problems. This is provided throughout the statute, on
topics including pollution in the Great Lakes and Chesapeake Bay, in-place toxic pollutants in
harbors and navigable waterways, and water pollution resulting from mine drainage. The act also
authorizes support to train personnel who operate and maintain wastewater treatment facilities.

Federal and State Responsibilities
Under this act, federal jurisdiction is broad, particularly regarding establishment of national
standards or effluent limitations. The Environmental Protection Agency (EPA) issues regulations
containing the BPT and BAT effluent standards applicable to categories of industrial sources
(such as iron and steel manufacturing, organic chemical manufacturing, petroleum refining, and
others). Certain responsibilities are delegated to the states, and this act, like other environmental
laws, embodies a philosophy of federal-state partnership in which the federal government sets the
agenda and standards for pollution abatement, while states carry out day-to-day activities of
implementation and enforcement. Delegated responsibilities under the act include authority for
qualified states to issue discharge permits to industries and municipalities and to enforce permits
(46 states have been delegated the permit program; EPA issues discharge permits in the remaining
states—Idaho, Massachusetts, New Hampshire, New Mexico—and the District of Columbia.). In
addition, as noted above, states are responsible for establishing water quality standards.

Titles II and VI—Municipal Wastewater Treatment Construction
Federal law has authorized grants for planning, design, and construction of municipal sewage
treatment facilities since 1956 (Act of July 9, 1956, or P.L. 84-660). Congress greatly expanded
this grant is program in 1972. Since that time Congress has authorized $65 billion and
appropriated more than $85 billion in Clean Water Act funds to aid wastewater infrastructure
plant construction (not including congressionally earmarked appropriations for specific projects).
Grants are allocated among the states according to a complex statutory formula that combines two
factors: state population and an estimate of municipal sewage treatment funding needs derived
from a biennial survey conducted by EPA and the states.
The most recent EPA-state estimate, completed in 2008, indicated that nearly $203 billion is
needed to build and upgrade needed municipal wastewater treatment plants in the United States
and for other types of water quality improvement projects that are eligible for funding under the
act. In 2002, EPA released a new report called the Gap Analysis which estimated that, over the
next two decades, the United States needs to spend nearly $390 billion to replace existing
wastewater infrastructure systems and to build new ones. Estimates of future funding needs and
questions about federal support continue to be prominent.
Under the Title II construction grants program established in 1972, federal grants were made for
several types of projects (such as secondary or more stringent treatment and associated sewers)
based on a priority list established by the states. Grants were generally available for as much as
55% of total project costs. For projects using innovative or alternative technology (such as reuse
or recycling of water), as much as 75% federal funding was allowed. Recipients were responsible
for non-federal costs but were not required to repay federal grants.
Policymakers have debated the tension between assisting municipal funding needs, which remain
large, and the impact of grant programs such as the Clean Water Act’s on federal spending and

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budget deficits. In the 1987 amendments to the act, Congress attempted to deal with that apparent
conflict by extending federal aid for wastewater treatment construction through FY1994, yet
providing a transition towards full state and local government responsibility for financing after
that date. Grants under the traditional Title II program were authorized through FY1990. Under
Title VI of the act, grants to capitalize State Water Pollution Control Revolving Funds, or loan
programs, were authorized beginning in FY1989 to replace the Title II grants. States contribute
matching funds, and under the revolving loan fund concept, monies used for wastewater
treatment construction will be repaid to a state, to be available for future construction in other
communities. All states now have functioning loan programs, but the shift from federal grants to
loans, since FY1991, has been easier for some than others. The new financing requirements have
been a problem for cities (especially small towns) that have difficulty repaying project loans.
Statutory authorization for grants to capitalize state loan programs expired in 1994; however,
Congress has continued to provide annual appropriations. An issue affecting some cities is
overflow discharges of inadequately treated wastes from municipal sewers and how cities will
pay for costly remediation projects. In 2000, Congress amended the act to authorize a two-year
$1.5 billion grant program to help cities reduce these wet weather flows. Authorization for that
wet weather grant program expired at the end of FY2003 and has not been renewed.

Permits, Regulations, and Enforcement
To achieve its objectives, the act embodies the concept that all discharges into the nation’s waters
are unlawful, unless specifically authorized by a permit. Thus, more than 65,000 industrial and
municipal dischargers must obtain permits from EPA (or qualified states) under the act’s National
Pollutant Discharge Elimination System (NPDES) program (authorized in Section 402 of the act).
NPDES permits also are required for more than 150,000 industrial and municipal sources of
stormwater discharges. An NPDES permit requires the discharger (source) to attain technologybased effluent limits (BPT or BAT for industry, secondary treatment for municipalities, or more
stringent for water quality protection). Permits specify the control technology applicable to each
pollutant, the effluent limitations a discharger must meet, and the deadline for compliance.
Sources are required to maintain records and to carry out effluent monitoring activities. Permits
are issued for five-year periods and must be renewed thereafter to allow continued discharge.
The NPDES permit incorporates numerical effluent limitations issued by EPA. The initial BPT
limitations focused on regulating discharges of conventional pollutants, such as bacteria and
oxygen-consuming materials. The more stringent BAT limitations emphasize controlling toxic
pollutants—heavy metals, pesticides, and other organic chemicals. In addition to these limitations
applicable to categories of industry, EPA has issued water quality criteria for more than 115
pollutants, including 65 named classes or categories of toxic chemicals, or “priority pollutants.”
These criteria recommend ambient, or overall, concentration levels for the pollutants and provide
guidance to states for establishing water quality standards that will achieve the goals of the act.
A separate type of permit is required to dispose of dredge or fill material in the nation’s waters,
including wetlands. Authorized by Section 404 of the act, this permit program is administered by
the U.S. Army Corps of Engineers, subject to and using EPA’s environmental guidance. Some
types of activities are exempt from these permit requirements, including certain farming,
ranching, and forestry practices which do not alter the use or character of the land; some
construction and maintenance; and activities already regulated by states under other provisions of
the act. EPA may delegate certain Section 404 permitting responsibility to qualified states and has
done so twice (Michigan and New Jersey). For some time, the act’s wetlands permit program has

Congressional Research Service

29

Environmental Laws: Summaries of Major Statutes Administered by EPA

been one of the most controversial parts of the law. Some who wish to develop wetlands maintain
that federal regulation intrudes on and impedes private land-use decisions, while
environmentalists seek more protection for remaining wetlands and limits on activities that take
place in wetlands.
Nonpoint sources of pollution, which EPA and states believe are responsible for the majority of
water quality impairments in the nation, are not subject to CWA permits or other regulatory
requirements under federal law. They are covered by state programs for the management of
runoff, under Section 319 of the act.
Other EPA regulations under the CWA include guidelines on using and disposing of sewage
sludge and guidelines for discharging pollutants from land-based sources into the ocean. (A
related statute, the Ocean Dumping Act, regulates the intentional disposal of wastes into ocean
waters.) EPA also provides guidance on technologies that will achieve BPT, BAT, and other
effluent limitations.
The NPDES permit, containing effluent limitations on what may be discharged by a source, is the
act’s principal enforcement tool. EPA may issue a compliance order or bring a civil suit in U.S.
district court against persons who violate the terms of a permit. The penalty for such a violation
can be as much as $25,000 per day. Stiffer penalties are authorized for criminal violations of the
act—for negligent or knowing violations—of as much as $50,000 per day, three years’
imprisonment, or both. A fine of as much as $250,000, 15 years in prison, or both, is authorized
for “knowing endangerment”—violations that knowingly place another person in imminent
danger of death or serious bodily injury. Finally, EPA is authorized to assess civil penalties
administratively for certain well-documented violations of the law. These civil and criminal
enforcement provisions are contained in Section 309 of the act. EPA, working with the Army
Corps of Engineers, also has responsibility for enforcing against entities who engage in activities
that destroy or alter wetlands.
While the CWA addresses federal enforcement, the majority of actions taken to enforce the law
are undertaken by states, both because states issue the majority of permits to dischargers and
because the federal government lacks the resources for day-to-day monitoring and enforcement.
Like most other federal environmental laws, CWA enforcement is shared by EPA and states, with
states having primary responsibility. However, EPA has oversight of state enforcement and retains
the right to bring a direct action where it believes that a state has failed to take timely and
appropriate action or where a state or local agency requests EPA involvement. Finally, the federal
government acts to enforce against crimina

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Source: Frix Law Library, https://www.frixlaw.com/law-library/documents/crs%3ARL30798. Public record. Not legal advice.
