On Sept. 21, 2026, the comment period begins for the proposal to issue an Arizona Pollutant Discharge Elimination System (AZPDES) renewal permit to Central Arizona Project (CAP) Water Conservation District for its Havasu (Mark Wilmer) Pumping Plant located in La Paz County, Arizona. The comment period ends Oct. 21, 2026.

AZPDES Permit No.: AZ0023990

Permittee: 

CAP Water Conservation District

Facility: 

Havasu (Mark Wilmer) Pumping Plant
60900 Highway 95
Parker, Arizona 85334
La Paz County

The CAP Water Conservation District applied for a renewal AZPDES permit for the proposed discharge of up to 0.122 million gallons per day (MGD) of non-domestic wastewater from the Havasu (Mark Wilmer) Pumping Plant to Lake Havasu in La Paz County, Arizona. The pumping plant is a water supply system that draws water from the Colorado River and transfers it to the CAP canal system for use in Maricopa, Pinal, and Pima counties.

Review Documents:

• Original Published Public Notice | View Notice > 
• Draft Permit | View Permit > 
• Draft Fact Sheet | View FS >  
• In person at the ADEQ Record Center | Learn How >

Public Comment Period:

Dates: Sept. 21, 2026 – Oct. 21, 2026

Comments may be submitted as follows:

•      By Email | Send Email >
•      By Mail (Must be postmarked or received by Oct. 21, 2026):

ADEQ
Water Quality Division, Surface Water Protection Permits
Attn: Rachael Willis
1110 W. Washington St.
Phoenix, AZ  85007