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EPA/OW RIN: 2040-AG35 Publication ID: Fall 2023 
Title: ●Mercury Criteria to Protect Aquatic Life in Idaho 

The Environmental Protection Agency (EPA) is proposing Federal Clean Water Act (CWA) aquatic life criteria for mercury applicable to waters under the State of Idaho’s jurisdiction. EPA is under a court-ordered deadline to sign for publication in the Federal Register proposed mercury aquatic life criteria for Idaho by April 4, 2024. EPA’s proposed water quality standards (WQS) will take into account the best available science, including local and regional information, as well as applicable EPA policies, guidance, and legal requirements.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 131   
Legal Authority: 33 U.S.C. 1313(c)(4)(A)   
Legal Deadline:  None
Action Date FR Cite
NPRM  04/00/2024 
Final Rule  12/00/2025 
Additional Information: EPA-HQ-OW-2023-0325.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Kelly Gravuer
Environmental Protection Agency
Office of Water
1200 Pennsylvania Avenue NW, Mail Code 4305T,
Washington, DC 20460
Phone:202 566-2946

Erica Fleisig
Environmental Protection Agency
Office of Water
4305T, 1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 566-1057