TTHMs

THHMs: what are they?

The MCLs for Total Trihalomethanes (TTHMs) apply to all community water systems and nontransient noncommunity water systems that treat their water with a chemical disinfectant or serve water that contains a disinfectant residual. This includes surface water,
groundwater, and consecutive water systems. TTHMs currently include the sum of the following 4 contaminants:
• Chloroform
• Bromodichloromethane
• Bromoform
• Dibromochloromethane
The MCL for TTHM = 0.080 mg/L, which can also be expressed as 80.0 ug/L.


MARCH 2022 LETTER TO CUSTOMERS: