Learn more about total trihalomethanes (TTHM), a group of disinfection byproducts, and what happens when an excess amount is found in drinking water.
They form when chemicals and organic material in the water react with disinfectants. Common disinfectants include chlorine and ozone. When TTHMs form, they can evaporate and enter the air. Seasonal changes can impact the amount of TTHM in water. TTHM levels may increase when water systems are dealing with repairs or contamination.
Type: Children's Health Issue: Water QualityInfo For: Families & CommunitiesHealth ProfessionalsPEHSU: Region 1Exposure Pathway: Water