What is the Maximum Contaminant Level (MCL) for chlorine according to US EPA regulations?

The Maximum Contaminant Level (MCL) for chlorine set by the US Environmental Protection Agency (EPA) is a key regulation intended to ensure safe drinking water. It is set at 4.0 parts per million (ppm). This regulatory standard represents the maximum permissible level of chlorine in the water supply to protect public health while allowing for the use of chlorine as a disinfectant.

Chlorine is commonly used in water treatment processes to kill harmful bacteria and other pathogens, making it crucial for maintaining safe water. However, excessive chlorine levels can lead to various health issues, so the regulation provides a clear benchmark to safeguard against overexposure.

Understanding the MCL is fundamental for water quality professionals and plumbing system managers as they work to adhere to these regulations, ensuring compliance and protection of public health within their systems.