# Federal Register 2026-20846 — effective 2026-11-12 — Colorado Underground Injection Control (UIC) Program; Class VI Primacy — Environmental Protection Agency

For Federal Register 2026-20846, effective date is 2026-11-12; agency is Environmental Protection Agency; published is 2026-10-13; cfr parts amended is 40 CFR 147, recorded from its source on 2026-10-12; source re-checked 2026-11-03.

- **FR document number:** 2026-20846 _(verified: appears in the quote below)_
- **Rule:** Colorado Underground Injection Control (UIC) Program; Class VI Primacy _(verified: appears in the quote below)_
- **Agency:** Environmental Protection Agency _(verified: appears in the quote below)_
- **Effective date:** 2026-11-12 _(verified: appears in the quote below)_
- **DATES, as printed:** This final rule is effective on November 12, 2026. The incorporation by reference of certain material listed in this rule is approved by the Director of the Federal Register as of October 13, 2026. For judicial purposes, this final rule is promulgated as of October 13, 2026. _(verified: appears in the quote below)_
- **CFR parts amended:** 40 CFR 147 _(our reading, not quoted from the source)_
- **Published:** 2026-10-13 _(verified: appears in the quote below)_

## What the source says

> {"document_number":"2026-20846","title":"Colorado Underground Injection Control (UIC) Program; Class VI Primacy","agency_names":["Environmental Protection Agency"],"effective_on":"2026-11-12","dates":"This final rule is effective on November 12, 2026. The incorporation by reference of certain material listed in this rule is approved by the Director of the Federal Register as of October 13, 2026. For judicial purposes, this final rule is promulgated as of October 13, 2026.","cfr_references":[{"chapter":null,"citation_url":null,"part":"147","title":40}],"publication_date":"2026-10-13","html_url":"https://www.federalregister.gov/documents/2026/10/13/2026-20846/colorado-underground-injection-control-uic-program-class-vi-primacy"}

## Source

- https://www.federalregister.gov/api/v1/documents.json?per_page=1000&order=oldest&conditions%5Btype%5D%5B%5D=RULE&conditions%5Beffective_date%5D%5Bgte%5D=2026-08-31&conditions%5Beffective_date%5D%5Blte%5D=2026-12-31&fields%5B%5D=document_number&fields%5B%5D=title&fields%5B%5D=agency_names&fields%5B%5D=effective_on&fields%5B%5D=dates&fields%5B%5D=cfr_references&fields%5B%5D=publication_date&fields%5B%5D=html_url

Last verified: 2026-11-03. Review by: 2026-11-16.
Part of [Federal rules taking effect: every US final rule in the Federal Register, by effective date](https://referencesource.org/federal-rules-taking-effect/).