What is the MRDL of Chlorine?

The maximum residual disinfectant level (MRDL) for chlorine is set at 4 parts per million (ppm) in drinking water regulations. This standard is established to balance the need for effective disinfection of water supplies while minimizing potential health risks associated with long-term exposure to disinfectants and their byproducts. Chlorine is commonly used to inactivate bacteria and viruses in water, and maintaining it at this level is crucial for ensuring the safety and quality of drinking water.

The choice of 4 ppm reflects regulatory guidance aimed at providing sufficient disinfection without posing undue risk to human health. This helps water treatment facilities ensure they effectively manage microbial contaminants while adhering to safety standards.