Contaminants

Limits

Sources

Potential Health Effect

Residual Chlorine

4 mg/L

Disinfectant added to control pathogens

Nervous system damage, anemia, and methemoglobinemia

Trihalomethanes: chloroform, bromodichloromethane, dibromochloromethane, and bromoform

80 mg/L

By-product of water chlorination

Cancer, liver disease, kidney failure, nervous system damage, bladder cancer, colorectal cancer, adverse development, and reproductive effects during pregnancy