What is the Maximum Contaminant Level (MCL) for total trihalomethanes?

The Maximum Contaminant Level (MCL) for total trihalomethanes is set at 0.08 parts per million (ppm) as per regulations established for drinking water quality. This level is determined based on health risk assessments that evaluate the potential effects of long-term exposure to these chemical compounds, which can form in drinking water during the chlorination process. Trihalomethanes are a group of chemical compounds that can pose health risks, including increased risk for certain types of cancer and adverse reproductive effects. Therefore, establishing a limit helps ensure that the public drinking water supply remains safe and minimizes these risks. Understanding the MCL is crucial for water operators who must regularly monitor water quality and ensure compliance with federal and state drinking water regulations.