Trihalomethanes (THM) are a group of four chemicals that are formed along with other disinfection byproducts when chlorine or other disinfectants used to control microbial contaminants in drinking water react with naturally occurring organic and inorganic matter in water. Trihalomethanes are chloroform, bromodichloromethane, dibromochloromethane, and bromoform. The maximum contaminant limit (MCL) for TTHM as per...Continue Reading