EPAFinal Rule
Arizona Underground Injection Control Program: Class I-VI Primacy
EnvironmentEnergyAgriculture
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Summary
Arizona has been approved to take over the federal government's responsibility for overseeing deep underground injection wells in the state. This means Arizona will now make and enforce rules about where companies can inject liquid waste deep underground, making sure it doesn't contaminate drinking water supplies.
Key Points
- 1Arizona now has primary authority to regulate six classes of underground injection wells (Class I through VI) instead of the EPA managing them
- 2The state will review and approve applications for new injection wells and monitor existing ones to prevent groundwater contamination
- 3Arizona must follow federal Environmental Protection Agency standards and minimum requirements while administering its own program
- 4This change affects oil and gas companies, waste management facilities, mining operations, and geothermal energy projects that use deep well injection
- 5Residents and businesses in Arizona can now work directly with state regulators rather than federal EPA officials on injection well matters
Key Dates
Published
September 15, 2025
This summary is for informational purposes only. It may not capture all nuances of the regulation. Always refer to the official text for authoritative information.
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