ADEQ Comments and Testimony on EPA Rules and Arizona Updates

www.azdeq.gov

Published January 6th, 2026

Detected March 17th, 2026

Summary

The Arizona Department of Environmental Quality (ADEQ) has published a collection of past comments and testimony submitted to the EPA and other bodies regarding various environmental regulations and updates. These documents cover a range of topics including air quality standards, water quality criteria, and emissions reporting requirements.

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What changed

The Arizona Department of Environmental Quality (ADEQ) has compiled a list of its past comments and testimony submitted to the U.S. Environmental Protection Agency (EPA) and other legislative bodies. These submissions, dated from 2023 to early 2026, address a variety of environmental regulatory matters, including proposed rules on ozone attainment, water quality standards (WOTUS, PFAS), air quality models, emissions reporting, and regional haze SIPs. The collection also includes requests for comment period extensions and support for legislative acts related to mine remediation and federal grant funding.

This compilation serves as a record of ADEQ's engagement with federal environmental policy and rulemaking. While these are comments and not new regulations, they indicate ADEQ's positions and concerns on issues impacting Arizona. Compliance officers should review these comments if they pertain to specific regulations their organization is subject to, as they may offer insight into potential future regulatory directions or enforcement priorities at both the state and federal levels. No immediate compliance actions are required based on this notice, as it is a historical record of submitted comments.

Source document (simplified)

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ADEQ

Past Comments and Testimony

Revised On: Jan. 6th, 2026 - 02:45 pm

2025

December 18 | ADEQ Comments on EPA's Proposed Determination of Attainment but for International Emissions Regarding Phoenix-Mesa Ozone | View Letter >
June 2 | ADEQ Comments on the March 24, 2025, WOTUS Notice: The Final Response to SCOTUS | View Letter >
May 21 | ADEQ Comments on continued funding for the Colorado River Basin Salinity Control Program | View Letters >
April 4 | ADEQ Comments on the draft National Recommended Ambient Water Quality Criteria for the Protection of Human Health for PFAS | View Letters >
February 24 | ADEQ Comments on the EPA's draft revisions to the Water Quality Standards Handbook | View Letters >
February 11 | ADEQ & the Arizona AgBMP Committee Request a Comment Period Extension for the EPA's Proposed Air Plan Revisions; Arizona | View Letters >
January 3 | ADEQ Comments on the EPA's Proposed Deadline Extension for the Regional Haze Third Planning Period | View Letter >

2024

Nov. 27, 2024 | ADEQ Comments on EPA's Proposed Consent Decree Affecting the Hayden SO 2 Nonattainment Area | View Letter >

Sept. 23, 2024 | ADEQ Comments on EPA's Proposed Conditional Approval of Maricopa County Air Pollution Control Rule 205 | View Letter >

Aug. 21, 2024 | ADEQ Requests Support for Good Samaritan Remediation of Abandoned Hardrock Mines Act of 2024 | View Letters >

July 15, 2024 | ADEQ Comments on EPA's Proposed Action for AZ's Regional Haze SIP for the Second Planning Period | View Letter >

June 25, 2024 | ADEQ Comments on EPA's "Protection of Visibility: Amendments to Requirements for State Plans Rule" | View Letter >

June 19, 2024 | ADEQ Requests Congress Increase Federal Grants to State and Local Air Quality Agencies to $500 Million in FY25 | View Letters >

May 31, 2024 | ADEQ Requests EPA Extend Comment Period for Proposed Air Quality Regional Haze SIP for the Second Implementation Period | View Letter >

May 16, 2024 | ADEQ Comments on EPA's Proposed Ozone Good Neighbor Plan for AZ | View Letter >

2023

Dec. 21, 2023 | ADEQ Comments on EPA's 2023 Proposed Revisions to the Guideline on Air Quality Models and Enhancements to the AERMOD Dispersion Modeling system | View Letter >

Nov. 17, 2023 | ADEQ Comments on Proposed Amendments to the Air Emissions Reporting Requirements | View Letter >

Aug. 22, 2023 | ADEQ Comments on EPA's Proposed Rulemaking on National Emission Standards for Hazardous Air Pollutants (Primary Copper Smelting) | View Letter >

Aug. 4, 2023 | ADEQ Comments on EPA's Proposed Power Plant Rule | View Letter >

July 13, 2023 | ADEQ Presentation to Joint Legislative Ad Hoc Study Committee on Air Quality and Energy re: State Air Quality Planning — State Implementation Plan (SIP) | View Presentation >

March 20, 2023 | ADEQ Comments on EPA's Proposed Rulemaking on Reconsideration of the National Ambient Air Quality Standards for Particulate Matter | View Letter >