Water Quality Division: Monitoring and Assessment: Assessment

Arizona's Integrated 305(b) Assessment and 303(d) Listing Report describes the status of surface water in Arizona in relation to state water quality standards. The report contains a 303(d) list of Arizona's impaired surface waters requiring the development of a Total Maximum Daily Load (TMDL) and fulfills requirements of the federal Clean Water Act sections 305(b) (assessments), 303(d) (impaired water identification), and 314 (status of lake water quality).

The Draft 2012/14 Status of Water Quality Arizona’s Integrated 305(b) Assessment and 303(d) Listing Report is now available. A 45-day Public Comment period will extend from May 2, 2014 to June 16, 2014.

The Draft 2010 Status of Water Quality in Arizona 305(b) Assessment Report has been broken down into sections for easier viewing and downloading. The 305(b) Report remains a draft until an appeal is resolved.

NOTE: This report does not provide information about the quality of water being provided by Arizona's public drinking water systems. See Safe Drinking Water for more information.

Impaired and Not Attaining Waters Lists - The 2010 303(d) has been approved by EPA and is now final.

For more information, please contact Jason Sutter - (602) 771-4468.