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EPA/WATER RIN: 2040-AD38 Publication ID: Spring 2006 
Title: National Primary Drinking Water Regulations: Stage 2 Disinfection Byproducts Rule 
Abstract: This Regulation, along with a Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR) that was promulgated simultaneously, is intended to expand existing public health protections and address concerns about risk trade-offs between pathogens and disinfection byproducts. The Stage 2 Disinfection Byproducts Rule (Stage 2 DBPR) was promulgated on January 4, 2006 (71 FR 388) and the LT2ESWTR was promulgated on January 5, 2006 (71 FR 654). This rule could affect all public water systems that add a disinfectant to the drinking water during any part of the treatment process, although the impacts may be limited to community water systems (CWSs) and non-transient non-community water systems (NTNCWSs). Promulgating the LT2ESWTR and the Stage 2 DBPR as a paired rulemaking was necessary to ensure that adequate protection from microbial risk is maintained while EPA manages risk from disinfection byproducts. In developing the Stage 2 DBPR, EPA analyzed a significant body of new survey data on source water quality parameters, treatment data and disinfection byproduct occurrence. This survey data, which was collected under the Information Collection Rule (ICR), Supplemental Surveys to the ICR, and additional research projects, provide a substantially more comprehensive and complete picture of the occurrence of DBPs and microbiological pathogens than was previously available. EPA also used new information on the health effects of exposure to DBPs to determine effective regulatory requirements for controlling risk. On March 30, 1999, EPA reconvened a committee of stakeholders under the Federal Advisory Committee Act (FACA) to assist in the development of these rules; an Agreement in Principle was signed in September 2000 outlining the proposed rule options. 
Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
Major: Yes  Unfunded Mandates: State, local, or tribal governments; Private Sector 
CFR Citation: 40 CFR 141-142    40 CFR 9     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 USC 300f    42 USC 300 g-1    42 USC 300g-2    42 USC 300g-3    42 USC 300g-4    42 USC 300g-5    42 USC 300g-6    42 USC 300j-4    42 USC 300j-9    42 USC 300j-11   
Legal Deadline:
Action Source Description Date
Final  Judicial  Consent Agreement  12/15/2005 
Timetable:
Action Date FR Cite
NPRM  08/18/2003  68 FR 49548   
Final Action  01/04/2006  71 FR 388   
Additional Information: SAN No. 4342; EPA publication information: Final Action - http://www.epa.gov/fedrgstr/EPA-WATER/2006/January/Day-04/w03.htm; ; EPA Docket information: EPA-HQ-OW-2002-0043
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Local, State, Tribal 
Small Entities Affected: No  Federalism: Yes 
Included in the Regulatory Plan: Yes 
RIN Information URL: http:/www.epa.gov.safewater/disinfection/stage2/index.html  
Sectors Affected: 22131 Water Supply and Irrigation Systems 
Agency Contact:
Tom Grubbs
Environmental Protection Agency
Water
4607,
Washington, DC 20460
Phone:202 564-5262
Fax:202 564-3767
Email: grubbs.thomas@epa.gov

Stig Regli
Environmental Protection Agency
Water
4607M, 4607,
Washington, DC 20460
Phone:202 564-5270
Fax:202 564-3767
Email: regli.stig@epa.gov