# 40 CFR § 51.104: Revisions

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-40-51.104

## Section

- **Citation:** 40 CFR § 51.104
- **Heading:** Revisions
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 40—Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS > PART 51—REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS > Subpart F—Procedural Requirements

## Text

(a) States may revise the plan from time to time consistent with the requirements applicable to implementation plans under this part.
(b) The States must submit any revision of any regulation or any compliance schedule under paragraph (c) of this section to the Administrator no later than 60 days after its adoption.
(c) EPA will approve revisions only after applicable hearing requirements of § 51.102 have been satisfied.
(d) In order for a variance to be considered for approval as a revision to the State implementation plan, the State must submit it in accordance with the requirements of this section.
[51 FR 40661, Nov. 7, 1986, as amended at 61 FR 16060, Apr. 11, 1996]

## Nearby sections

- [40 CFR § 51.100 § 51.100 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.100.md)
- [40 CFR § 51.101 § 51.101 Stipulations.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.101.md)
- [40 CFR § 51.102 § 51.102 Public hearings.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.102.md)
- [40 CFR § 51.103 § 51.103 Submission of plans, preliminary review of plans.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.103.md)
- [40 CFR § 51.104 § 51.104 Revisions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.104.md)
- [40 CFR § 51.105 § 51.105 Approval of plans.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.105.md)
- [40 CFR § 51.110 § 51.110 Attainment and maintenance of national standards.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.110.md)
- [40 CFR § 51.111 § 51.111 Description of control measures.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.111.md)
- [40 CFR § 51.112 § 51.112 Demonstration of adequacy.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.112.md)
- [40 CFR § 51.114 § 51.114 Emissions data and projections.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.114.md)
- [40 CFR § 51.115 § 51.115 Air quality data and projections.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.115.md)
- [40 CFR § 51.116 § 51.116 Data availability.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.116.md)
- [40 CFR § 51.117 § 51.117 Additional provisions for lead.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.117.md)
- [40 CFR § 51.118 § 51.118 Stack height provisions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-51.118.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-40-51.104. Check the current official text before relying on it. Not legal advice.