What is the Maximum Contaminant Level (MCL) for Total Trihalomethanes (TTHMs)?

The Maximum Contaminant Level (MCL) for Total Trihalomethanes (TTHMs) is set at 0.08 ppm (parts per million). This standard was established by the Environmental Protection Agency (EPA) under the Safe Drinking Water Act to protect public health from the potential adverse effects of TTHMs, which can form as a byproduct of the disinfection process utilizing chlorine in water treatment.

TTHMs are a group of chemicals that can have harmful effects when present in drinking water at elevated levels, including possible links to cancer and adverse reproductive effects. The MCL is designed to limit exposure to these contaminants, thereby ensuring the safety and quality of drinking water provided to the public.

By regulating TTHMs at this specific level, water utilities can better plan their treatment processes and maintain compliance with federal regulations, ultimately safeguarding public health and confidence in drinking water systems. The other options do not reflect the established MCL, which is why they do not fit the requirement as set by the EPA.