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Rulemaking | Aquifer Water Quality Standards Update

Active Rulemaking

Update to Aquifer Water Quality Standards


Revised on: April 16, 2024 - 12:27 p.m.

ADEQ is responsible for the development of the drinking water aquifer water quality standards (AWQS). See A.R.S. § 49-223.1. 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. § 49-224.2. The AWQS are used in ADEQ’s Aquifer Protection Permit program (APP), remediation projects under the Water Quality Assurance Revolving Fund (WQARF), the Voluntary Remediation Program (VRP), and elsewhere.  In 2021, the Auditor General recommended ADEQ open a rulemaking docket to adopt the seven federal drinking water maximum contaminant levels (MCLs) that have either not been established in the AWQS or have been established but are misaligned | View Fact Sheet >


Notice of Docket Opening

18 A.A.C. Chapter 11 | View > 

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 this rulemaking, subscribe to our Aquifer Water Quality Standards (AWQS) email list | Subscribe to Receive Updates >

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