DBPRs: What Does it Mean to You? | US EPA
EPA provides guidance documents to help states and public water systems (PWSs) implement the Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts (DBP) Rules. The materials below can assist in complying with requirements of these Rules including updates to reflect the Stage 2 DBP Rule.
Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules
The Stage 1 Disinfectants and Disinfection Byproducts Rule (DBPR) reduces drinking water exposure to disinfection byproducts. The Rule applies to community water systems and non-transient non-community systems, including those serving fewer than 10,000 people that add a disinfectant to the drinking water during any part of the treatment process.
Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules
The Stage 1 Disinfectants and Disinfection Byproducts Rule (DBPR) reduces drinking water exposure to disinfection byproducts. The Rule applies to community water systems and non-transient non-community systems, including those serving fewer than 10,000 people that add a disinfectant to the drinking water during any part of the treatment process.
Disinfection and Disinfection Byproducts Rules (DBPRs) (Stage 1 & 2)
Disinfection and Disinfection Byproducts Rules (DBPRs) (Stage 1 & 2) Author: USEPA Region 8 - Mary Wu Subject: Disinfection and Disinfection Byproducts Rules (DBPRs) (Stage 1 & 2) Keywords: DBPR; Disinfection Byproducts Rule; Stage 1 & 2; Disinfectants; Chlorine; Chloramine; MRDLs; Precursors; TTHM; HAA5; TOC Created Date: 2/26/2025 1:16:18 PM
Disinfectants & Disinfection Byproducts Rules Presentation
Revised presentation on Disinfectants & Disinfection Byproducts Rules (DBPRs) given by Mary Wu (EPA Region 8) at the WWQ&PCA Conference in Casper, Wyoming in October of 2014. Disinfectants & Disinfection Byproducts Rules Presentation (597.75 KB, 4/24/2015) Contact Us to ask a question, provide feedback, or report a problem.
- What is the stage 1 disinfectants and disinfection byproducts rule (DBPR)?
- The Stage 1 Disinfectants and Disinfection Byproducts Rule (DBPR) reduces drinking water exposure to disinfection byproducts. The Rule applies to community water systems and non-transient non-community systems, including those serving fewer than 10,000 people that add a disinfectant to the drinking water during any part of the treatment process.
- What does DBPR stand for?
- Taken together, the Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules (DBPRs) improve drinking water quality. The rules do this by providing protection from disinfection byproducts. Byproducts, if consumed in excess of EPA's standard over many years, may increase health risks.
- How can DBPR improve management of DBP precursors in drinking water?
- Improve management of DBP precursors in drinking water sources. Public water systems that receive some or all of finished water from one or more wholesale systems. Stage 2 DBPR had the most MCL violations. Consecutive systems had MCL violation rate 3.5 times greater than non-consecutive systems.
- What is a DBPR & how does it work?
- Bromate. EPA has developed the DBPRs to limit exposure to these disinfectant byproducts. These documents provide a simple and straightforward description of the rule and critical deadlines. They also detail requirements for drinking water PWSs and states, and information on monitoring requirements.
- When do DBPs form in water?
- DBPs can form in water when disinfectants used to control microbial pathogens combine with naturally occurring materials found in source water. These Rules apply to all Community Water Systems (CWS) and Non-Transient Non-Community Water Systems (NTNCWS) that add/deliver a primary or residual disinfectant, and TNCWs that use chlorine dioxide.
- What are the DBPR analytical and monitoring requirements?
- The Stage 1 DBPR analytical and monitoring requirements for chlorine, chloramines, bromate, chlorine dioxide and chlorite apply to all CWSs and NTNCWSs that add a chemical disinfectant to the water in any part of the drinking water treatment process. In addition, certain requirements apply to TNCWSs that use chlorine dioxide.
