What is the history of DBP regulation?
In November 1979, EPA set an interim maximum contaminant level (MCL) for total THMs of 0.10 milligrams per liter (mg/L) as an annual average for community public water systems (PWSs) serving 10,000 or more people. The Stage 1 Disinfectants and Disinfection Byproducts Rule (DBP1) was promulgated in December 1998 as the first phase in a rulemaking strategy required by Congress as part of the 1996 Amendments to the Safe Drinking Water Act. DBP1 lowered the MCL for THMs to 0.080 mg/L, and added an MCL for HAAs of 0.060 mg/L, both based on an annual average. The Stage 2 Disinfectants and Disinfection Byproducts Rule (DBP2) of December 2005 builds upon the DBP1 to address higher risk public water systems for protection measures beyond those required for existing regulations.
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