What is the MCL for chlorite in public water systems?

The maximum contaminant level (MCL) for chlorite in public water systems is established at 1.0 parts per million (ppm). This regulation is in place to ensure the safety of drinking water, as elevated levels of chlorite can pose health risks to consumers. Chlorite is a disinfection byproduct that can result from the use of chlorine dioxide during water treatment processes. The MCL is determined based on various studies that assess the potential adverse health effects associated with long-term exposure to chlorite, including its potential impact on red blood cells and overall health.

Maintaining chlorite levels below the MCL is a critical responsibility for water operators, as they must ensure that water treatment processes are effectively controlled and that any byproducts remain within safe limits for human consumption. Regular monitoring and testing are essential practices to ensure compliance with the MCL for chlorite and to protect public health.