What is the MCL for Haloacetic Acids (HAA5)?

Haloacetic acids (HAA5) are a group of five regulated disinfection byproducts that can form when chlorine or other disinfectants react with organic matter in surface water. The Maximum Contaminant Level (MCL) set by the Environmental Protection Agency (EPA) for HAA5 is 60 parts per billion (ppb). This standard is established to protect public health by limiting exposure to potentially harmful substances in drinking water.

Understanding the significance of this MCL is essential, as elevated levels of HAA5 can be associated with health risks, including an increased risk of certain cancers with long-term exposure. The choice of 60 ppb reflects a balance between maintaining water quality and ensuring the safety of drinking water for the public.

The incorrect options refer either to parts per million (ppm) or to different MCLs that do not apply to HAA5, which underscores the importance of knowing the specific regulations that apply to various contaminants in drinking water. Recognizing the correct MCL helps ensure compliance with environmental standards and the protection of public health.