PUBLIC NOTICE | Proposed Major Modification of AZPDES Permit (AZ0020001) Coverage for Tres Rios Water Reclamation Facility

Public Notice No. 18-37

Published in The Daily Territorial on Feb. 22, 2019

AZPDES Permit No. AZ0020001

Notice: Pursuant to the Clean Water Act and in accordance with Arizona Administrative Code (AAC) R18-9-A907, the Director of ADEQ proposes to issue an Arizona Pollutant Discharge Elimination System (AZPDES) Permit major modification to discharge pollutants to Waters of the United States to the following applicant, subject to certain effluent limitations and special conditions:


Pima County Regional Wastewater Reclamation Department

Mailing Address

2955 W. Calle Agua Nueva
Tucson, AZ 85745

Facility Information

Tres Rios Water Reclamation Facility (WRF)

Pima County Wastewater Reclamation Department is authorized to discharge treated domestic wastewater from the Tres Rios WRF to the Santa Cruz River in Pima County, Ariz. The Tres Rios WRF is a publicly owned treatment works that receives domestic wastewater from residential, commercial and industrial sources in the Tucson metropolitan area. On December 14, 2018, ADEQ received a request from the permittee to modify the AZPDES permit, which became effective on July 10, 2017. The modification request is to change the Ammonia Impact Ratio (AIR) limit for Daily Maximum in Table 1 to be set at a value of two (2).

Review Documents

Original Published Public Notice | View/Print >
Draft Permit | View >
Statement of Basis | View >

You may also review the above documentation in person at the ADEQ Record Center | Learn How >

Public Comment Period 

Dates: Feb. 22, 2019 – March 25, 2019

Comments may be submitted as follows:
     By Email | Send Email >  
     By Mail (Must be postmarked or received by March 25, 2019):

       Swathi Kasanneni
       Water Quality Division
       1110 W. Washington Street
       Phoenix, AZ  85007