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EPA/OW RIN: 2040-AG25 Publication ID: Fall 2023 
Title: Clean Water Act Methods Update Rule for the Analysis of Effluent 

OW regularly promulgates updates to the table of approved Clean Water Act (CWA) monitoring methods at 40 CFR 136.3. This routine Methods Update Rule (rMUR) was proposed in February 2023. For this routine MUR, EPA will only consider new methods or method revisions for which a complete, acceptable method package has been received by January 7, 2022. EPA will consider only methods submitted through the Alternate Test Procedure (ATP) program; from Voluntary Consensus Standard Bodies (VCSBs); and other government Agencies. EPA is not currently considering any changes to radiochemical or Whole Effluent Toxicity methods because of the extensive data requirements and review associated with these methods. EPA is not considering methods for new analytes in this routine MUR. More information on specific requirements for submission of method packages for new methods/revisions, see

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 136.3   
Legal Authority: 33 U.S.C. sec. 1314(h)    33 U.S.C. sec. 1251 et seq.   
Legal Deadline:  None
Action Date FR Cite
NPRM  02/21/2023  88 FR 10724   
NPRM Comment Period End  04/24/2023 
Final Rule  12/00/2023 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Tracy Bone
Environmental Protection Agency
Office of Water
Washington, DC 20460
Phone:202 564-5257
Fax:202 564-3753

Meghan Hessenauer
Environmental Protection Agency
Office of Water
Washington, DC 20460
Phone:202 566-1040
Fax:202 566-1053