What is the ideal chlorine residual in a distribution system after 24 hours?

The ideal chlorine residual in a distribution system after 24 hours is typically considered to be around 1.0 mg/L. This level effectively balances the need to maintain disinfection in the water while minimizing taste and odor issues that can occur with higher concentrations. A residual of 1.0 mg/L is sufficient to ensure that pathogenic microorganisms are effectively controlled throughout the distribution system, providing safe drinking water while avoiding excessive chlorine that may lead to unpleasant sensory effects for consumers.

In distribution systems, maintaining an adequate chlorine residual is crucial for the continuous protection against bacterial regrowth and water quality deterioration. While different systems might have specific guidelines based on local regulations or water characteristics, a residual of 1.0 mg/L represents a recommended benchmark that ensures public health without compromising water quality.