Environmental Protection Agency
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.
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 147 [EPA-HQ-OW-2025-0087; FRL-11786-02-OW] AGENCY: Environmental Protection Agency (EPA). ACTION: Final rule. SUMMARY: 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. DATES: This final rule is effective on October 15, 2025. The incorporation by reference of certain material listed in ( printed page 44328) 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. ADDRESSES: The EPA has established a docket for this action under Docket ID No. EPA-HQ-OW-2025-0087. All documents in the docket are listed on the http://www.regulations.gov website. Although listed in the index, some info…
Other Federal Register documents from the same docket.
Citation: 90 FR 44327
