# 40 CFR § 147.103: Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-40-147.103

## Section

- **Citation:** 40 CFR § 147.103
- **Heading:** Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule
- **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 D—WATER PROGRAMS > PART 147—STATE, TRIBAL, AND EPA-ADMINISTERED UNDERGROUND INJECTION CONTROL PROGRAMS > Subpart C—Alaska

## Text

Maximum injection pressure. The owner or operator shall limit injection pressure to the lesser of:
(a) A value which will not exceed the operating requirements of § 144.28(f)(3) (i) or (ii) as applicable; or
(b) A value for well head pressure calculated by using the following formula:
Pm = (0.733-0.433 Sg)d
where:
Pm = injection pressure at the well head in pounds per square inch
Sg = specific gravity of inject fluid (unitless)
d = injection depth in feet.

## Nearby sections

- [40 CFR § 147.1 § 147.1 Purpose and scope.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.1.md)
- [40 CFR § 147.2 § 147.2 Severability of provisions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.2.md)
- [40 CFR § 147.50 § 147.50 State-administered program—Class II wells.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.50.md)
- [40 CFR § 147.51 § 147.51 State-administered program—Class I, III, IV, and V wells.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.51.md)
- [40 CFR § 147.52 § 147.52 State-administered program—Hydraulic Fracturing of Coal Beds.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.52.md)
- [40 CFR § 147.60 § 147.60 EPA-administered program—Indian lands.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.60.md)
- [40 CFR § 147.100 § 147.100 State-administered program—Class II wells.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.100.md)
- [40 CFR § 147.101 § 147.101 EPA-administered program.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.101.md)
- [40 CFR § 147.102 § 147.102 Aquifer exemptions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.102.md)
- [40 CFR § 147.103 § 147.103 Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.103.md)
- [40 CFR § 147.104 § 147.104 Existing Class II enhanced recovery and hydrocarbon storage wells authorized by rule.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.104.md)
- [40 CFR § 147.150 § 147.150 State-administered program—Classes I, II, III, IV, V and VI wells.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.150.md)
- [40 CFR § 147.151 § 147.151 EPA-administered program.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.151.md)
- [40 CFR § 147.200 § 147.200 State-administered program—Class I, III, IV, and V wells.](https://www.frixlaw.com/law-library/statutes/ecfr-40-147.200.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-40-147.103. Check the current official text before relying on it. Not legal advice.