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