Organic
Total Trihalomethanes
Contaminant Overview and Health Effects
EPA Maximum Contaminant Level (MCL)
0.08 mg/L
Legal limit set by the EPA
Contaminant Code
TTHM
Health Effects
Liver, kidney, or central nervous system problems, increased risk of cancer
Common Sources
1
Disinfection byproducts 2
Chlorine reaction with organic matter âšī¸ About This Data
Information about Total Trihalomethanes is based on EPA Safe Drinking Water Act (SDWA) regulations. The Maximum Contaminant Level (MCL) is the highest level of a contaminant that is allowed in drinking water.