Arizona Grabs Control of Statewide Underground Injection Wells
Published Date: 9/15/2025
Rule
Summary
Arizona just got the green light to manage all underground injection wells (Classes I-VI) in the state, making sure water stays safe and clean. This means the Arizona Department of Environmental Quality (ADEQ) will take charge instead of the EPA, except on most Indian lands. This change starts soon and helps Arizona keep a close eye on underground wells without extra costs for the public.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 0 costs, 1 mixed.
Arizona Takes UIC Oversight
If you live in Arizona, the Arizona Department of Environmental Quality (ADEQ) will now authorize and oversee underground injection wells (Classes I–VI) under the Safe Drinking Water Act section 1422 instead of the EPA within the State's jurisdiction. The document says this change starts soon and will help Arizona keep a close eye on underground wells without extra costs for the public.
EPA Retains Authority On Indian Lands
If you live on Indian lands in Arizona, the EPA will remain the permitting authority for all underground injection well classes within those lands. The document also says the Navajo Nation has been granted primacy for SDWA Class II wells on Navajo Indian lands.
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