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Water: Stage 2 DBP Rule

Stage 2 Disinfectants and Disinfection Byproduct Rule (Stage 2 DBP rule)

This site provides information about the Stage 2 Disinfectants and Disinfection Byproducts Rule (DBP rule).

The Stage 2 DBP rule builds upon earlier rules that addressed disinfection byproducts to improve your drinking water quality and provide additional public health protection from disinfection byproducts. This final rule strengthens public health protection for customers by tightening compliance monitoring requirements for two groups of DBPs, trihalomethanes (TTHM) and haloacetic acids (HAA5). The rule targets systems with the greatest risk and will reduce potential health risks related to DBP exposure and provide more equitable public health protection

This web site is designed to provide you with basic information about the Stage 2 rule as well as links to additional information about particular topics such as training for implementation, frequent questions, and guidance. Use the links below or on the sidebar to find out more about the Stage 2 rule.

National Primary Drinking Water Regulations: Minor Correction to Stage 2 Disinfectants and Disinfection Byproducts Rule and Changes in References to Analytical Methods | PDF Version (83K,  About PDF)

The Stage 2 DBP rule was published in the Federal Register on January 4, 2006.

Basic Information - This page provides basic information about the rule.
Stage 2 DBP Rule - Visit this page to read the Stage 2 DBP rule and to learn about the history of the rulemaking.
Compliance Help - If you need to comply with the Stage 2 DBP rule, visit this page to get available guidance, tools and training information.


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