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Completed Rulemakings

Water Quality Division

Revised On: Apr. 29th, 2026 - 09:16 am

ADEQ maintains a list of completed rulemakings on our website for two years following their effective dates. Following is a list of completed rulemakings related to the Water Quality Division:

Summary:

ADEQ is pursuing a regular rulemaking to amend Arizona Administrative Code Title 18, Chapter 11, Section 216 The Protected Surface Water List, Table B WOTUS Protected Surface Waters, by adding a protected surface water. ADEQ seeks to add a mitigation wetland established by the Bureau of Land Management (BLM) as a protected surface water under Appendix B and assign appropriate water quality standards to this wetland.

Documents:

  • Notice of Docket Openings | View Docket >
  • Notice of Proposed Rulemaking | View NPRM >
  • Notice of Comment Period
    • Comment Period: May 9, 2025 - June 8, 2025
    • Extended Comment Period: Aug. 22, 2025 – Sept. 21, 2025
  • Notice of Final Rulemaking | View NFRM >

Effective Date: April 20, 2026

Additional Information:

  • Paradise Cove West Reasonable Potential Analysis Calculations | View >
  • Governor’s Regulatory Review Council (GRRC) Study Session and Council Meeting Agendas, Meeting Documents, including PDF copies of materials provided to GRRC for rulemakings, and Minutes will be available on GRRC's website | Visit Website >
    • GRRC study session | Tuesday, Jan. 27, 2026
    • GRRC council meeting | Tuesday, Feb. 3, 2026

Summary:

Due to an immediate need for fee increases to maintain the solvency of the MAP fund, and to conform with recent legislative MAP changes, ADEQ amended A.A.C. Title 18, Chapter 4, Article 3 to adjust Drinking Water Monitoring Assistance Program (MAP) fees and create a fee and regulatory structure to allow ADEQ to perform triggered increased monitoring.

Documents:

  • Notice of Docket Opening | View NDO >
  • Notice of Proposed Rulemaking | View NPRM >
  • Notice of Comment Period & Public Hearing
    • Comment Period: April 11, 2025 – May 13, 2025
    • Virtual Public Hearing:
      Date: May 13, 2025
      Time: 12 p.m.
      Location: Online via GoToWebinar
  • Notice of Final Rulemaking (filed with the Secretary of State on Oct. 8, 2025) | View NFRM  >

Effective Date: Dec. 7, 2025

Additional Information:

  • Governor’s Regulatory Review Council (GRRC) Study Session and Council Meeting Agendas (for September 30, 2025 and October 7, 2025, respectively) and Meeting Documents, including PDF copies of materials provided to GRRC for rulemakings, and Minutes are available on GRRC's website | Visit Website > 
  • Learn more about MAP on the ADEQ web page | View MAP Page >
  • Informal Draft Proposed Rule Previously Provided in August 2024 for Stakeholder Feedback | View Feedback >
  • February 2024 Stakeholder Meeting Presentation | View 2024 Pres. >
  • August 2023 Stakeholder Meeting Presentation | View 2023 Pres. >

Summary:

ADEQ is responsible for the development of the drinking water aquifer water quality standards (AWQS) (see A.R.S. § 49-223). These standards are designed to protect the State's aquifers, all of which have been designated for drinking water-protected use (see A.R.S. § 49-224(B)). The AWQS are used in ADEQ’s Aquifer Protection Program (APP), remediation projects under the Water Quality Assurance Revolving Fund (WQARF), the Voluntary Remediation Program (VRP), and elsewhere. According to A.R.S. § 49-223, ADEQ must open a rulemaking docket for the adoption of MCLs as AWQSs within one year of EPA's establishment of new or adjusted MCLs. Pursuant to the aforementioned statutes, ADEQ adopted four (4) new AWQSs (Bromate, Chlorite, Haloacetic Acids and Uranium) and adjusted three (3) others (Arsenic, Microbiological Contaminants and Total Trihalomethanes). Along with this rulemaking action on standards, ADEQ is adopting an implementation rule to clearly define a procedure for implementing new or adjusted AWQS into issued individual APP permits | View Fact Sheet >

Documents:

Notice of Docket Opening:

  • 18 A.A.C. Chapter 9 | View > 
  • 18 A.A.C. Chapter 11 | View > 

Notice of Proposed Rulemakings:

  • 18 A.A.C. 9, Articles 1 & 2 — Implementation | View > 
  • 18 A.A.C. 11, Article 4 — Arsenic | View > 
  • 18 A.A.C. 11, Article 4 — Uranium | View > 
  • 18 A.A.C. 11, Article 4 — Microbiological Contaminants | View > 
  • 18 A.A.C. 11, Article 4 — Disinfection Byproducts | View > 

Notice of Comment Period & Public Hearing

  • Comment Period: Nov. 15, 2024 – Dec. 16, 2024
  • Virtual Public Hearing 
    • Date: Dec. 16, 2024
    • Time: 11 a.m. (MST — Arizona)
    • Location: GoToWebinar

Notices of Final Rulemaking:

  • 18 A.A.C. 9, Articles 1 & 2 — Implementation | View >
  • 18 A.A.C. 11, Article 4 — Arsenic | View >
  • 18 A.A.C. 11, Article 4 — Uranium | View >
  • 18 A.A.C. 11, Article 4 — Microbiological Contaminants | View >
  • 18 A.A.C. 11, Article 4 — Disinfection Byproducts | View >

Effective Date: Aug. 4, 2025

Additional Information:

  • View the Resources Page for the draft rule, fact sheet, standard works, past meeting agendas, presentations, etc. | View >
  • For notifications and updates regarding the Aquifer Water Quality Standards (AWQS) and AWQS Implementation, subscribe to our AWQS list. When selecting subscription topics, select Water Quality, proceed to the next page(s), and then select AWQS where listed | Subscribe >
  • Governor’s Regulatory Review Council (GRRC) Study Session materials | Visit Website > 
  • Governor’s Regulatory Review Council (GRRC) Council Meeting materials | Visit Website > 

1A.R.S. § 49-223 | View >
2A.R.S. § 49-224 | View >

Summary: 

ADEQ revised water quality rules in Title 18 of the Arizona Administrative Code (A.A.C.) through expedited rulemakings. The objective of the rulemakings was to correct typographical errors, update outdated citations and references, clarify language, and fix similar clerical issues in Chapters 4, 5, 9, and 11, which will not add regulatory burden.

Documents:

Notice of Docket Openings:

  • 18 A.A.C. Chapter 4 | View >
  • 18 A.A.C. Chapter 5 | View >
  • 18 A.A.C. Chapter 9 | View >
  • 18 A.A.C. Chapter 11 | View >

Notice of Proposed Expedited Rulemakings:

  • 18 A.A.C. Chapter 4 | View >
  • 18 A.A.C. Chapter 5 | View >
  • 18 A.A.C. Chapter 9 | View >
  • 18 A.A.C. Chapter 11 | View >

Notice of Comment Period

  • Sept. 6, 2024 – Oct. 7, 2024

Notice of Final Expedited Rulemakings | View >

Effective Date: March 7, 2025

Additional Information:

  • Governor’s Regulatory Review Council (GRRC) Study Session and Council Meeting Agendas, Meeting Documents, including PDF copies of materials provided to GRRC for rulemakings, and Minutes will be available on GRRC's website | Visit Website >
  • Hybrid Stakeholder Meeting — Aug. 14, 2024, 1 p.m.

Summary:

ADEQ revised the Arizona Administrative Code (A.A.C.) to allow for the expansion of potable reuse for facilities subject to the Safe Drinking Water Act and for pilot, demonstration, or educational facilities. Expanding potable reuse will improve the sustainability of Arizona’s water supplies.

While potable reuse, direct and indirect, was previously allowed under ADEQ’s rules in A.A.C. Title 18, Chapter 9, Article 7, Part E, regulatory specificity in the form of a robust, state-based and authorized regulatory program is needed to support water suppliers’ ability to engage in potable reuse while ensuring protection of public health and the environment in Arizona.

Documents:

Notices of Docket Openings:

  • 18 A.A.C. Chapter 1 | View >
  • 18 A.A.C. Chapter 4 | View >
  • 18 A.A.C. Chapter 5 | View >
  • 18 A.A.C. Chapter 9 | View >
  • 18 A.A.C. Chapter 14 | View >

Notice of Proposed Rulemakings:

  • 18 A.A.C. Chapter 1 | View >
  • 18 A.A.C. Chapter 5 | View >
  • 18 A.A.C. Chapter 9 | View >
  • 18 A.A.C. Chapter 14 | View >

Notice of Comment Period & Public Hearing

  • Comment Period: Nov. 1, 2024 – Dec. 2, 2024
  • Virtual Public Hearing 
    • Date: Dec. 2, 2024
    • Time: 9 a.m. (Arizona)
    • Location: Online via GoToWebinar 

Notice of Final Rulemakings (filed with the Secretary of State: March 4, 2025):

  • 18 A.A.C. Chapter 1 | View >
  • 18 A.A.C. Chapter 5 | View >
  • 18 A.A.C. Chapter 9 | View >
  • 18 A.A.C. Chapter 14 | View >

Effective Date: March, 4, 2025

Additional Information:

  • Governor’s Regulatory Review Council (GRRC) Study Session and Council Meeting Agendas, Meeting Documents, including PDF copies of materials provided to GRRC for rulemakings, and Minutes will be available on GRRC’s website | Visit Website >
    • Study Session: Feb. 25, 2025
    • Council Meeting: March 4, 2025
  • AWP Proposed Program Roadmap | View >
  • Advanced Water Purification Fact Sheet | View >
  • Stakeholder Meetings & Resources | View >
  • Frequently Asked Questions | View Consumer FAQs > | View Water System FAQs >
  • For notifications and updates regarding the development of an advanced water purification program and the Technical Advisory Group, subscribe to our Advanced Water Purification list. When selecting subscription topics, select Water Quality, proceed to the next page(s), and then select Advanced Water Purification where listed | Subscribe >