Active Rulemaking | Numeric Surface Water Quality Standards Update

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Active Rulemaking

Numeric Surface Water Quality Standards Update

  • Revised on: May 29, 2024 - 1:54 p.m.

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 (as submitted to the Secretary of State — includes study links) | View >
  • Notice of Proposed Rulemaking (published May 17, 2024) | View >
  • Notice of Comment Period & Public Hearing | View > 
    • Comment Period: May 17, 2024 – Aug. 2, 2024
    • Hybrid Public Hearing | View Details > 
      • Date: July 17, 2024
      • Time: 1 p.m.
      • Location: ADEQ Phoenix Office, Room 3175 or Online via GoToWebinar

Additional Information:

  • ADEQ will hold a virtual informational meeting about this rulemaking:
    • Date: June 17, 2024
    • Time:1:30 – 2:30 p.m.
    • Location: Online via GoToWebinar | Register >
  • Interested stakeholders can follow rulemaking progress | View Status >