THHMs: what are they?
The MCLs for Total Trihalomethanes (TTHMs) apply to all community water systems and non-transient 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:
The MCL for TTHM = 0.080 mg/L, which can also be expressed as 80.0 ug/L.
APRIL 2022 LETTER TO CUSTOMERS:
MARCH 2022 LETTER TO CUSTOMERS: