Similar term(s): THMs.
A class of organic compounds, based on the methane molecule (CH4)
where the hydrogen atoms normally present are replaced by three halogen atoms
(chlorine, bromine, fluorine and/or iodine). Examples include chloroform and
An important and predominant group of chlorinated drinking water byproducts,
trihalomethanes can occur as a result of the reaction between natural organic
matter in the water and chlorine added as a disinfectant. The term 'Total
Trihalomethanes' (TTHM) describes four disinfection by products, chloroform,
bromodichloromethane, dibromochloromethane, and bromoform that may be sampled in
a water sample.
Natural organic matter - Water disinfection by-product(s)
To read about this term in context:
GreenFacts Summary on Water Disinfectants & disinfectant by-products: