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 also contains a list of Arizona's impaired surface waters, including a list of surface waters requiring the development of a Total Maximum Daily Load (the 303(d) List). The report fulfills requirements of the federal Clean Water Act sections 305(b) (assessments), 303(d) (impaired water identification), and 314 (status of lake water quality). 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.

NEW! EPA Region 9 has finished reviewing the Integrated 305(b) Assessment and 303(d) Listing Report and has posted to the Federal Register for public comment. Read EPA's decision to add waters to Arizona's 2006/2008 303(d) List .

The list includes those surface waters in Arizona that ADEQ has identified as not meeting water quality standards. View the complete integrated report below.

2006/2008 303(d) Impaired Waters List

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The 2006-2008 Status of Ambient Surface Water Quality in Arizona should be reviewed and used in conjunction with the Surface Water Assessment Methods and Technical Support, which describes ADEQ's methods for evaluating water quality data and assessing designed use support.

Download the entire 2006/2008 Integrated 305(b) Assessment and 303(d) Listing Report. (Tip: You can use the bookmark tool to navigate through the document faster.)

If you are only interested in a specific section of the assessment and listing report you can download the section individually by the following chapters and appendices.

Chapter I & II: Introduction and Purpose, Water Quality Assessments by Watershed

• Bill Williams Watershed
• Colorado - Grand Canyon Watershed
• Colorado - Lower Gila Watershed
• Little Colorado Watershed
• Middle Gila Watershed
• Salt River Watershed
• San Pedro Watershed
• Santa Cruz Watershed
• Upper Gila Watershed
• Verde River Watershed

Chapter III & IV: Summary Information, Action Plan

• Assessment Appendix A - Assessment Units
• Assessment Appendix B - Assessments by Category
• Assessment Appendix C - TMDL Priority Ranking and Schedule
• Assessment Appendix D - Critical Conditions
• Assessment Appendix E - Delisting Impairments
• Assessment Appendix F - Water Quality Improvements
• Assessment Appendix G - Methods and Technical Support
  • Methods Appendix G1 - Selected surface water quality standards
  • Methods Appendix G2 - TMDL statute
  • Methods Appendix G3 - Impaired water identification rule
  • Methods Appendix G4 - Terms and abbreviations

If you have questions about the draft report, please contact:

Anel Avila
(602) 771-4647

Arizona's final 2004 Integrated 305(b) Assessment and 303(d) Listing Report was submitted to EPA in 2004 for approval of the 303(d) list of impaired waters. EPA made the decision to add 19 surface waters, and eight additional pollutants on waters already listed, to Arizona's list. All corresponding tables, maps and assessment statistics were changed to reflect those additions. To obtain a copy of this integrated report please contact:

Danese Cameron
(602) 771-4569
(800) 243-5677, Ext. 771-4569 - Toll Free