{"data":{"id":"us/40-cfr-147.1953","jurisdiction":"us","citation":"40 CFR 147.1953","heading":"Existing Class I, II (except enhanced recovery and hydrocarbon storage) and III wells authorized by rule.","body":"Maximum injection pressure. The owner or operator shall limit injection pressure to the lesser of:\n(a) A value which will not exceed the operating requirements of § 144.28(f)(3) (i) or (ii) as applicable or\n(b) A value for well head pressure calculated by using the following formula:\nPm = (0.733 − 0.433 Sg)d\nwhere:\nPm = injection pressure at the well head in pounds per square inch\nSg = specific gravity of injection fluid (unitless)\nd = injection depth in feet.","path":["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 NN—Pennsylvania"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"cdbb29db2957dd8db6006dfc570a2a4309438c6b670ee4b8746c090ec7be90ac","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-147.1952","next":"us/40-cfr-147.1954"},"notice":"GroundRules: Original legal text. Not legal advice."}