Water Quality Division

Image of water taken under the water with a close-up of air bubbles rasing to the surface

Surface Water Monitoring and Assessment

The Surface Water Monitoring and Assessment program fulfills federal Clean Water Act (CWA) requirements for statewide water quality monitoring and assessments. Specific activities include providing critical information about water quality conditions and establishing water quality standards. ADEQ staff use monitoring data to assess whether lake and stream uses are protected by the CWA and can be used for recreation, drinking, agriculture, wildlife and fish consumption.

A primary focus of the program is preparing Arizona’s Integrated 305(b) Assessment and 303(d) Listing Reports that describe the status of surface water in Arizona in relation to state water quality standards and designated uses. The report lists Arizona’s impaired surface waters that require development of a Total Maximum Daily Load (TMDL) study and fulfills CWA requirements for assessments, impaired water identification and lake water quality (CWA sections 305(b), 303(d) and 314, respectively).

2018 303(d) List of Impaired Waters | View/Print > | View Map >
2018 Delist Report | View/Print >

2016 Status of  Water Quality in Arizona 305(b) Assessment Report | View Report >

2016 Surface Water Quality Standards | View Standards > 

Surface Water Reports Library | View >