EPA Eyes Arizona Primacy for Underground Injection Control Program
Published Date: 5/19/2025
Proposed Rule
Summary
Arizona wants to take charge of underground injection wells that keep our drinking water safe. If approved, Arizona’s environmental team will manage these wells instead of the EPA, making sure everything follows the rules. This change mostly affects well operators in Arizona and could speed up local decisions without extra costs.
Analyzed Economic Effects
3 provisions identified: 1 benefits, 0 costs, 2 mixed.
Arizona gains UIC primacy for Class I–VI
The EPA proposes to approve Arizona’s application so the Arizona Department of Environmental Quality (ADEQ) would take primary enforcement responsibility (primacy) for Class I–VI underground injection wells under Safe Drinking Water Act section 1422 within the State of Arizona. This change would move authorization and compliance oversight for these wells from the EPA to ADEQ for wells located in Arizona (except on Indian lands).
Indian lands excluded from state primacy
The proposed approval would not apply to underground injection wells located on Indian lands; the EPA would retain authority for wells on Indian lands rather than ADEQ taking primacy there.
State oversight may speed local decisions
The document states that Arizona’s takeover of the UIC program could speed up local decisions and would not add extra costs. If approved, local operators in Arizona could see faster authorizations while facing no additional costs according to the proposal.
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Key Dates
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