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Stage 2 Disinfectants and Disinfection Byproduct Rule (Stage 2 DBP rule) |  |
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Stage 2 RuleWelcome to the Stage 2 Disinfectants and Disinfection Byproducts Rule (Stage 2 DBP rule) page. On this site you will find links to the rule, fact sheets as well as general information about the history of the rulemaking. Stage 2 DBP Rule Federal Register Notices and Fact SheetsThe Stage 2 DBP rule is one part of the Microbial and Disinfection Byproducts Rules (MDBPs), which are a set of interrelated regulations that address risks from microbial pathogens and disinfectants/disinfection byproducts. The Stage 2 DBP rule focuses on public health protection by limiting exposure to DBPs, specifically total trihalomethanes (TTHM) and five haloacetic acids (HAA5), which can form in water through disinfectants used to control microbial pathogens. This rule will apply to all community water systems and nontransient noncommunity water systems that add a primary or residual disinfectant other than ultraviolet (UV) light or deliver water that has been disinfected by a primary or residual disinfectant other than UV. The Stage 2 DBP rule was published in the Federal Register on January 4, 2006.
Quick Reference Guide to Stage 2 DBP RuleThis document provides a simple and straightforward description of the rule, critical deadlines and requirements for drinking water systems and states, and information on monitoring requirements. Questions and AnswersStage 2 DBP Rule Supporting DocumentsThe following documents were developed to support the final rule-making.
Rulemaking HistoryStage 2 DBP Rule Proposal Federal Register Notice
Stake Holder Meetings
Agreement in PrincipleThe basic framework for the rule was developed by the Stage 2 Microbial/Disinfection Byproductfederal advisory committee which was comprised of state and local government, environmental, public health and water industry stakeholders.
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