Economic Impact Study of R81-11 Trihalomethane Standards for Public Water Supplies

摘要

The researchers of this report discovered that the trihalomethanes in this country and the Netherlands were formed during the chlorination step in drinking water treatment. Nationwide surveys showed that the reaction occurred to some extent in every drinking water treatment plant where free chlorine was being used for disinfection. As a result of these findings, an intensive research program was begun here and abroad to study all aspects of this emerging problem. Therefore, in 1979, U.S.E.P.A. promulgated an amendment to the National Interim Primary Drinking Water Regulations establishing a Maximum Contaminant Level (MCL) of 0.10 mg/ for 'Total Trihalomethanes,' which is the arithmetic sum of the concentrations of chloroform, bromodichloromethane, dibromochloromethane, and bromoform.