What is the acceptable limit for total trihalomethanes (THMs) in drinking water?

Total trihalomethanes (THMs) are a group of chemical compounds that can form when chlorinated drinking water reacts with organic matter. These compounds are of concern because long-term exposure to THMs has been linked to various health issues, including an increased risk of cancer.

The acceptable limit for total trihalomethanes in drinking water, as regulated by the Environmental Protection Agency (EPA), is set at 0.080 mg/L (or 80 µg/L). This standard is established to protect public health while allowing water utilities to use chlorine as a disinfectant, which is effective in controlling microbial contaminants.

Option B reflects this regulatory standard, representing the threshold that drinking water utilities must adhere to in order to ensure the safety of their water supply regarding THM concentrations. Adhering to this limit helps minimize health risks to the population while maintaining necessary water treatment practices.