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EPA/WATER RIN: 2040-AE87 Publication ID: Spring 2010 
Title: Guidance for Implementing the Methylmercury Water Quality Criterion 
Abstract: In the 2001 Federal Register notice of the availability of EPA’s recommended water quality criterion for methylmercury, EPA stated that it would develop associated procedures and guidance for implementing the criterion. For states and authorized tribes exercising responsibility under CWA section 303(c), this document provides technical guidance on how they might want to use the recommended 2001 fish tissue-based criterion to develop and implement their own water quality standards for methylmercury. The guidance addresses topics including adoption and revision of standards, monitoring, waterbody assessment, water quality standards issues, TMDL development, and NPDES permitting. Since atmospheric deposition is considered to be a major source of mercury for many waterbodies, implementing this criterion involves coordination across media and program areas. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: None     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 33 USC 1251 et seq   
Legal Deadline:  None
Action Date FR Cite
Final Revision to 2009 Guidance  04/00/2010    
Additional Information: SAN No. 5098; EPA Docket information: EPA-HQ-OW-2006-0656.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:  
RIN Data Printed in the FR: No 
Agency Contact:
Holly Green
Environmental Protection Agency
Washington, DC 20460
Phone:202 566-0651

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