Rulemaking Resources | Aquifer Water Quality Standards Update

Active Rulemaking

Resources | Aquifer Water Quality Standards Update

Revised On: Feb. 17th, 2026 - 11:38 am

Completed Rulemaking Page (under 2025 Aquifer Water Quality Standards (AWQS) Update) | View >

Fact Sheet | View >

Final Rule

AWQS Rule | View >
AWQS Implementation Plan | View >

Guidance Documents

Alternative Baseline Monitoring Request | View ABM Guidance >
Unlikely to be Present in Discharge Demonstration | View Demo Guidance >
New or Adjusted AWQS Baseline Monitoring Report Template | View Template >
New AWQS Rule Flow Chart | View Chart >

How ADEQ Adopts Maximum Contaminant Limits (MCLs) as AWQS

Standard Works

ADEQ has developed a methodical, defensible Standard Work or procedure for the agency to follow when MCLs are established or changed in the future based on the statutory requirements in A.R.S. § 49-223 (A) & (B).

A.R.S. § 49-223 A & B | View >

Appropriateness

AWQS Appropriate 1 | View >
AWQS Appropriate 2A | View >
AWQS Appropriate 2B | View >
AWQS Appropriate 3 | View >

Alternative

AWQS Alternative 4 | View >
AWQS Alternative 5A | View >
AWQS Alternative 5B | View >
AWQS Alternative 6 | View >

Meeting Resources

2026

February 9

Presentation | View Feb. 9 Pres. >

2025

September 3

Meeting Agenda | View Sept. 3 Agenda >
Presentation | View Sept. 3 Pres. >

July 21

Meeting Agenda | View July 21 Agenda >
Presentation | View July 21 Pres. >

June 12

Stakeholder Meeting Agenda | View June 12 Agenda>
Presentation | View June 12 Pres. >

Subscribe

For notifications and updates regarding Aquifer Water Quality Standards, subscribe to the list. When selecting subscription topics, select Water Quality, proceed to the next page(s), and then select Aquifer Water Quality Standards (AWQS) where listed | Subscribe >