40 CFR § 147.1153 - Existing Class II disposal wells authorized by rule in Indian country.

---
identifier: "/us/cfr/t40/s147.1153"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 147.1153 - Existing Class II disposal wells authorized by rule in Indian country."
title_number: 40
title_name: "Protection of Environment"
section_number: "147.1153"
section_name: "Existing Class II disposal wells authorized by rule in Indian country."
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"
---


# 147.1153 Existing Class II disposal wells authorized by rule in Indian country.

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) of this chapter as applicable; or

(b) A value for well head pressure calculated by using the following formula:

Pm = (0.800−0.433 Sg)d

Where:

Pm = injection pressure at the well head in pounds per square inch.

Sg = specific gravity of injected fluid (unitless).

d = injection depth in feet.

[87 FR 45256, July 28, 2022]