What is the purpose of Stage 1 DBPR?
The Stage 1 Disinfectants and Disinfection Byproducts Rule (DBPR) reduces drinking water exposure to disinfection byproducts.
What are DBPs?
Disinfection by-products (DBPs), also called trihalomethanes, are formed when chlorine and bromine interact with natural organic materials in water, such as in chlorinated drinking water and chlorine-treated swimming pools.
How many disinfection by-products are currently regulated and what are they?
In the U.S., regulatory limits have been established for 11 DBPs: THM4, 5 haloacetic acids (HAA5; chloroacetic acid, bromoacetic acid, dichloroacetic acid, dibromoacetic acid, trichloroacetic acid), bromate and chlorite. (14) With minor differences, the DBPs targeted for regulation are similar in other countries.
Is chlorite a disinfection by product?
Chlorite and chlorate are disinfection by-products resulting from the use of chlorine dioxide as a disinfectant and for odour/taste control in water. Chlorine dioxide is also used as a bleaching agent for cellulose, paper pulp, flour and oils and for cleaning and detanning leather.
What does the stage 2 DBPR Manual do?
This manual assists PWS in meeting requirements for operational evaluations under the Stage 2 DBPR. The manual provides guidance for documenting and reporting an operational evaluation level (OEL) exceedance. This manual discusses issues that PWSs will face as they evaluate and implement rules simultaneously.
What is supplement B for Stage 2 DBPR?
Supplement B – for Subpart H CWSs and NTNCWSs that add a chemical disinfectant and use conventional filtration. This manual assists PWS in meeting requirements for operational evaluations under the Stage 2 DBPR.
Why are Stage 1 and Stage 2 disinfectants important?
The rule targets public water systems (PWSs) with the greatest risk. Taken together, the Stage 1 and Stage 2 Disinfectants and Disinfection Byproducts Rules (DBPRs) improve drinking water quality.
How does the EPA limit exposure to disinfectant byproducts?
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.