What are the microbial/disinfection byproducts (MDBP) rules and which ones apply to me?
The MDBP requirements have been in place for close to 30 years and include the following federal rules: • Total Trihalomethanes monitoring and MCL, promulgated Nov 1979 • Surface Water Treatment Rule, promulgated June 1989 • Interim Enhanced Surface Water Treatment Rule and Stage 1 Disinfectants / Disinfection Byproducts Rule, promulgated Dec 1998 • Filter Backwash Rule, promulgated June 2001 • Long Term 1 Enhanced Surface Water Treatment Rule, promulgated Jan 2002 • Long Term 2 Enhanced Surface Water Treatment Rule and Stage 2 Disinfectants / Disinfection Byproducts Rule, promulgated Jan 2006 • Groundwater Rule, promulgated Nov 2006 The Disinfectants and Disinfection Byproducts (DBP) rules apply to all community water systems using a disinfectant such as chlorine, chloramines, ozone and chlorine dioxide. Compliance with the Stage 1 DBP requirements began in 2000. The Stage 2 DBP requirements began in 2006 with the Initial Distribution System Evaluation (IDSE). Compliance monitoring fo
