On Sept. 18, 2026, the comment period begins for the Total Maximum Daily Load (TMDL) for the Upper Queen Creek Watershed, for copper and lead impairments on Queen Creek and its tributaries in Pinal County near Superior, Arizona. The comment period ends Oct. 20, 2026.

A TMDL is a scientific determination of the maximum amount of a given pollutant that a surface water can assimilate and still meet the water quality standards that protect human health and aquatic life. The TMDL program is designed to help an impaired stream or lake meet its water quality standards and support its designated uses, such as protection of aquatic life, drinking water, or fish consumption | Learn More >

Review Documents: 

• Original Published Public Notice | View Notice > 
• Draft Total Maximum Daily Load | View Report >  
• In person at the ADEQ Record Center | Learn How >

Public Comment Period:

Dates: Sept. 18, 2026 – Oct. 20, 2026

Comments may be submitted as follows:  

• Online | Submit Comments >
• By Email | Send Email >
• By Mail (Must be postmarked or received by Oct. 20, 2026):

ADEQ
Water Quality Division, Surface Water Sampling & Source ID
Attn: Zachary White
1110 W. Washington St.
Phoenix, AZ  85007