Arizona Underground Injection Wells regulations & environmental compliance analysis

Arizona Underground Injection Wells: What you need to know

Governing Law and Regulations

Classification of wells: Arizona Administrative Code Rules (AZ Admin. Code R) 12-7-175

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Permits for injection wells: AZ Admin. Code R 12-7-175 to 12-7-179

Change in operations: AZ Admin. Code R 12-7-178

Testing and monitoring: AZ Admin. Code R 12-7-179

Hazardous waste underground injection well prohibition: AZ Admin. Code R 18-8-270(B)(2)

Drywells: AZ Admin. Code R 18-9-C301 and AZ Admin. Code R 18-9-C304

Regulatory Agencies

Arizona Department of Environmental Quality (ADEQ) Waste Programs Division Oil and Gas Conservation Commission (Commission)

U.S. Environmental Protection Agency (EPA) Region 9

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Unlike the federal rules, Arizona prohibits the direct disposal or discharge of hazardous waste into or onto underground injection wells. Arizona issues injection permits for Class II and Class V wells, including drywells and wells used for geothermal injection. See the national section UNDERGROUND INJECTION WELLS for more information.

Administration and enforcement. ADEQ enforces this disposal prohibition in Arizona, and is charged with administering and enforcing the underground injection well regulations in Arizona.

State Requirements


AZ Admin. Code R 12-7-175

Arizona will issue permits only for the following injection wells. All other injection wells are prohibited in Arizona.

  • Class II injection wells —Saltwater disposal wells used to return salt water associated with oil and gas production —Enhanced oil recovery wells used to inject salt water, gases, enhanced waters, and steam in ...

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