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EPA/OW RIN: 2040-AA94 Publication ID: Spring 2020 
Title: National Primary Drinking Water Regulations: Radon 
Abstract: In 1999, the EPA proposed regulations for radon which provide flexibility in how to manage the health risks from radon in drinking water. The proposal was based on the unique framework in the 1996 Safe Drinking Water Act (SDWA) amendments. The proposed regulation would provide for either a maximum contaminant level (MCL), or an alternative maximum contaminant level (AMCL) with a multimedia mitigation (MMM) program to address radon in indoor air. Under the proposal, public water systems in states that adopted qualifying MMM programs would be subject to the AMCL, while those in states that did not adopt such programs would be subject to the MCL. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: Yes  Unfunded Mandates: State, local, or tribal governments 
EO 14192 Designation: Regulatory 
CFR Citation: 40 CFR 141    40 CFR 142   
Legal Authority: 42 U.S.C. 300f   
Legal Deadline:
Action Source Description Date
None       
Timetable:
Action Date FR Cite
ANPRM  09/30/1986  51 FR 34836   
NPRM  07/18/1991  56 FR 33050   
Notice  02/26/1999  64 FR 9560   
Second NPRM  11/02/1999  64 FR 59246   
Final Rule  To Be Determined 
Additional Information: Docket #:EPA-HQ-OW-2003-0041
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: Undetermined  Federalism: Yes 
Included in the Regulatory Plan: No 
RIN Information URL: http://www.epa.gov/ogwdw/radon.html  
Sectors Affected: 221310 Water Supply and Irrigation Systems; 924110 Administration of Air and Water Resource and Solid Waste Management Programs 
RIN Data Printed in the FR: No 
Agency Contact:
Lisa Christ
Environmental Protection Agency
Office of Water
1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-8354
Email: christ.lisa@epa.gov

Eric Burneson
Environmental Protection Agency
Office of Water
4607M, 1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-5250
Email: burneson.eric@epa.gov