What is the maximum contaminant level for total trihalomethanes (TTHM) in the United States?

The maximum contaminant level for total trihalomethanes (TTHM) in the United States is set at 0.080 mg/L. This standard is established by the Environmental Protection Agency (EPA) to protect public health by limiting the concentration of these disinfection byproducts in drinking water. TTHMs can form when chlorine or other disinfectants react with organic material in the water supply, and excessive levels may pose health risks, including potential long-term effects such as cancer.

Understanding the regulatory limit helps water utility professionals monitor and manage water quality effectively to ensure that safe drinking water is delivered to consumers. This standard reflects scientific research into the potential health impacts of TTHMs, which is crucial for maintaining public health and environmental safety.