What is the MCL for chloramines (Cl2) in drinking water?

The maximum contaminant level (MCL) for chloramines in drinking water is set at 4.0 mg/L. This standard is established to regulate the residual levels of chloramines, which are used as a disinfectant in water treatment processes. The MCL is based on the potential health effects and the need to ensure safe drinking water quality.

Chloramines are formed when ammonia is added to chlorine, and they play a crucial role in controlling microbial pathogens in the water supply. However, excessive levels can lead to undesirable health effects or taste and odor issues. The regulation of chloramine levels at 4.0 mg/L reflects a balance between effective disinfection practices and maintaining public safety.

Understanding the MCL for different disinfectants, including chloramines, is essential for water treatment operators. It ensures compliance with regulations, helps maintain water quality, and protects public health.