Arizona's Integrated 305(b) Assessment and 303(d) Listing Report describes the status of surface 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).

Please 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.

2004 Integrated 305(b) Assessment and 303(d) Listing Report

• View 2004 Report
• 2004 Impaired Waters List

Draft 2006 Integrated 305(b) Assessment and 303(d) Listing Report

• 2006 Draft Impaired Waters List
• 2006 Draft Not-Attaining List

Draft Surface Water Assessment Methods and Technical Support

• 2006 Status of Ambient Surface Water Quality in Arizona: Arizona's Integrated 305(b)
  Assessment and 303(d) Listing Report
• Appendices to the Methods document
  • Appendix A: Selected Arizona Surface Water Quality Standards
  • Appendix B: TMDL Statute
  • Appendix C: Impaired Water Identification Rule
  • Appendix D: Acronyms, Abbreviations, and Definitions
• Appendices to the 305(b) Report
  • Appendix A: Assessment Units
  • Appendix B: Assessment by Category
  • Appendix C: TMDL Priority Ranking and Schedule
  • Appendix D: Critical Conditions
  • Appendix E: Delisting Impairments
  • Appendix F: Water Quality Improvements

Draft Surface Water Assessment Methods and Technical Support

• View Draft Document

Watershed Assessments

• 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

Submitting Data for the 2008 Report
Credible Data Requirements

See also:
  Fact Sheet: Assessing and Protecting Surface Water Quality
  TMDL Program