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Active Rulemaking

Numeric Surface Water Quality Standards Update

Revised On: Nov. 12th, 2024 - 01:10 pm

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 >

Additional Information:

  • Interested stakeholders can follow rulemaking progress | View Status >