Data / Federal rules / 2025-17769

Arizona Underground Injection Control (UIC) Program; Class I-VI Primacy

The Environmental Protection Agency published this final rule in the Federal Register on September 15, 2025. It took effect on October 15, 2025.

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What the agency says

The U.S. Environmental Protection Agency (EPA) is approving an application from the State of Arizona (the State) that requests primary enforcement responsibility (primacy) for Class I-VI injection wells under the Safe Drinking Water Act (SDWA) section 1422. The EPA's approval of the State's UIC program primacy application will allow the Arizona Department of Environmental Quality (ADEQ) to authorize underground injection for all underground injection wells regulated under the SDWA within the State's jurisdiction and ensure compliance with UIC program requirements. The EPA will remain the permitting authority for all well classes on Indian lands within the State, except for Class II wells on Navajo Indian lands for which the EPA has granted the Navajo Nation primacy for the SDWA Class II UIC program.

Key facts

Document number: 2025-17769
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 15, 2025
Takes effect: October 15, 2025
Dates: This final rule is effective on October 15, 2025. The incorporation by reference of certain material listed in this rule is approved by the Director of the Federal Register as of October 15, 2025. For judicial purposes, this final rule is promulgated as of October 15, 2025.
Docket: EPA-HQ-OW-2025-0087; FRL-11786-02-OW
Code of Federal Regulations: 40 CFR 147
Topics: Environmental protection; Incorporation by reference; Indians-lands; Intergovernmental relations; Reporting and recordkeeping requirements; Water supply
Pages: 7

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on environmental protection · Rules on incorporation by reference · Rules on indians-lands · Published in September 2025

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.