What is the typical acceptable range for chlorine residual in distributed drinking water?

The typical acceptable range for chlorine residual in distributed drinking water is primarily established to ensure effective disinfection while maintaining safety for consumers. A residual chlorine concentration of 0.5 to 4.0 mg/L is generally deemed appropriate because it effectively kills pathogens and helps prevent the regrowth of bacteria in the distribution system.

Levels below 0.5 mg/L may not provide adequate disinfection, raising concerns about waterborne diseases. On the other hand, concentrations above 4.0 mg/L can lead to unpleasant tastes and odors, and may be harmful to sensitive populations. This range balances the need for effective disinfection with consumer safety and taste preferences, making it the standard for assessing chlorine residuals in drinking water distribution systems.