Different disinfectants produce different types or amounts of disinfection byproducts.
Disinfection byproducts for which regulations have been established have been identified in drinking water, including trihalomethanes, haloacetic acids, bromate, and chlorite. The trihalomethanes are chloroform, bromodichloromethane, dibromochloromethane, and bromoform. This standard will replace the current standard of a maximum allowable annual average level of 100 parts per billion in December 2001 for large surface water public water systems . The standard will become effective for the first time in December 2003 for small surface water and all ground water systems. This standard will become effective for large surface water public water systems in December 2001 and for small surface water and all ground water public water systems in December 2003.