What is the MCL for Chlorine?

The maximum contaminant level (MCL) for chlorine in drinking water is established at 4 mg/L. This standard is set to protect public health, as chlorine is commonly used as a disinfectant in water treatment processes. Maintaining chlorine levels at or below this MCL helps to ensure that the water is effectively disinfected without posing health risks to consumers from excessive exposure.

High levels of chlorine can lead to taste and odor issues, as well as potential health problems, making it important for water operators to monitor and control chlorine concentrations in the water supply. Adhering to the MCL ensures that the water treated with chlorine remains safe and palatable for consumption. Through regular testing and adjustment of chlorine levels, water treatment facilities can comply with regulatory requirements and safeguard public health.