Regulation of Disinfection By-Products

• EARLY HISTORY OF DBP REGULATION (Table 7-1)– Three things to consider:

• Ensure microbiological safety• Safe drinking water is not necessarily risk-free• Consider the ability of well-designed and operated water

systems to meet the standard

• REGULATION OF TRIHALOMETHANES (THMs)– 1979 MCL for TTHM: 0.10 mg/L – balancing of public

health considerations and the feasibility of public water systems achieving the MCL

• REGULATION OF DBPs UNDER THE 1986 SDWA AMENDMENTS– 1989 Straw man– Regulatory Negotiation

• REGULATION OF DBPs UNDER THE 1996 SDWA AMENDMENTS– The Final Stage 1 D/DBP Rule: Dec. 16, 1998

• MICROBIALS/DISINFECTION BY-PRODUCTS CLUSTER REGULATORY SCHEDULE AND FUTURE RULES