What is the Maximum Contaminant Level (MCL) for Trihalomethanes in drinking water?

The Maximum Contaminant Level (MCL) for Trihalomethanes (THMs) in drinking water is established to ensure the safety and health of the water supply. The MCL for THMs is set at 0.080 mg/l (or parts per million). This limit is in place because THMs, which are by-products formed during the chlorination of drinking water, can pose health risks such as potential cancer and other adverse effects. The Environmental Protection Agency (EPA) established this MCL based on their evaluations of risks and the presence of these contaminants in drinking water supplies.

Understanding the importance of maintaining THM levels below this threshold helps water operators and public health officials manage and mitigate risks associated with drinking water safety. It reflects a commitment to public health by controlling the levels of contaminants that could be harmful if consumed over long periods.