Elevated levels of THMs above the standard in the drinking water regulations

Trihalomethanes (THMs) form when natural organic matter in the water source, such as rotting vegetation, reacts with chlorine used in the disinfection treatment process. The standard for THMs in drinking water is 100 µg/l.
Chart: IRISH TIMES GRAPHICSSource: EPA- annual drinking water report Q4-2023Created with Datawrapper