40 CFR § 147.3012 - Construction requirements for Class I wells.

---
identifier: "/us/cfr/t40/s147.3012"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 147.3012 - Construction requirements for Class I wells."
title_number: 40
title_name: "Protection of Environment"
section_number: "147.3012"
section_name: "Construction requirements for Class I wells."
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"
---


# 147.3012 Construction requirements for Class I wells.

In addition to the cementing requirement of § 146.12(b) of this chapter, owners and operators of Class I wells shall, through circulation, cement all casing to the surface.