What is the MCL for HAA5?

The maximum contaminant level (MCL) for HAA5, which stands for haloacetic acids, is set at 0.060 mg/l. This standard is established by the Environmental Protection Agency (EPA) to protect public health by limiting exposure to these disinfection byproducts formed when chlorine or other disinfectants react with natural organic matter in source water.

The significance of this value lies in its role in ensuring safe drinking water, as elevated levels of HAA5 can pose potential health risks, including increased risk of cancer and reproductive issues. The MCL is a regulatory limit aimed at minimizing these risks in drinking water systems, ensuring that water suppliers maintain compliance through regular monitoring and remediation if necessary.

Understanding this MCL is crucial for water treatment operators, as it guides their practices and the monitoring of water quality to protect consumers from harmful contaminants.