ADEQ is conducting a rulemaking to update water quality standards for Waters of the United States (WOTUS) under the federal Clean Water Act (CWA). The rulemaking will modify A.C.C. Title 18, Chapter 11, Article 1 to accomplish the following goals:

• Update the criteria applied to surface water quality standards used by ADEQ to protect public health to the levels required by EPA;
• Modify the designated uses of some WOTUS protected by the CWA to reflect how those WOTUS are currently used; and
• Make technical edits to Appendix B to ensure waterbody descriptions are accurate. 

Documents:

• Notice of Docket Opening | View >
• Notice of Proposed Rulemaking (published May 17, 2024) | View >
• Notice of Supplemental Proposed Rulemaking | View >
  • Comment period: Nov. 8, 2024 – Dec. 20, 2024 
  • Hybrid Public Hearing, Dec. 18, 2024 

Additional Information:

• Interested stakeholders can follow rulemaking progress | View Status >