40 CFR § 147.2153 - Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule.

---
identifier: "/us/cfr/t40/s147.2153"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 147.2153 - Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule."
title_number: 40
title_name: "Protection of Environment"
section_number: "147.2153"
section_name: "Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "147"
part_name: "STATE, TRIBAL, AND EPA-ADMINISTERED UNDERGROUND INJECTION CONTROL PROGRAMS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 300f  and 42 U.S.C. 6901"
regulatory_source: "49 FR 20197, May 11, 1984, unless otherwise noted."
cfr_part: "147"
---


# 147.2153 Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule.

*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 = (0.600−0.433 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.