What is the minimum free chlorine residual recommended for drinking water?

The minimum free chlorine residual recommended for drinking water is important for ensuring the disinfection of potable water and maintaining water quality as it travels through the distribution system. A residual concentration of 0.2 mg/l is often deemed sufficient to provide effective disinfection against bacteria and other pathogens while also reducing the potential for taste and odor issues.

This concentration strikes a balance between providing adequate microbial protection and limiting the risk of disinfection byproducts, which can form at higher levels of chlorine. Consequently, maintaining this minimum level helps protect public health while ensuring that the water remains safe and palatable for consumption.