Arizona Stormwater-Municipalities regulations & environmental compliance analysis

Arizona Stormwater-Municipalities: What you need to know

Governing Law and Regulations

Arizona Pollutant Discharge Elimination permits: Arizona Administrative Code Rules (AZ Admin. Code R) 18-9-A902

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Municipalities: AZ Admin. Code R 18-9-A902(D) to R 18-9-A902(F)

Regulatory Agencies

Arizona Department of Environmental Quality (ADEQ)Water Quality DivisionWater Permits Section

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. Arizona is authorized by the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) permit program, including for stormwater discharges associated with municipal separate storm sewer systems (MS4s). See the national section STORMWATER—MUNICIPALITIES for additional guidance on the federal permitting requirements.

The state refers to its NPDES permit program as the Arizona Pollutant Discharge Elimination System (AZPDES) permit program. For more information about AZPDES permits, see the state section NPDES PERMIT.

Administration and enforcement. ADEQ's Water Permits Section administers stormwater discharge permit requirements in Arizona.

State Requirements

MUNICIPALITIES

AZ Admin. Code R 18-9-A902(D) to R 18-9-A902(F)

The ADEQ issues general permits for stormwater discharges associated with small MS4s and has issued eight individual permits for stormwater discharges associated with the large and medium MS4s in the state.

Small MS4s

Under the federal Phase II stormwater regulations established by the EPA, some municipalities are required to obtain a permit for their municipal stormwater discharges. While many ...


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