What is the maximum allowable concentration of chlorine in drinking water?

The maximum allowable concentration of chlorine in drinking water is set at 4 mg/L. This standard is established by the U.S. Environmental Protection Agency (EPA) to protect public health while ensuring that water is safe for consumption. Chlorine is commonly used as a disinfectant in water treatment facilities to kill bacteria and other pathogens. However, it is important to maintain appropriate levels to avoid potential health risks associated with higher concentrations.

A concentration of 4 mg/L balances the effectiveness of chlorine in disinfection while minimizing any adverse effects on human health. Excessive chlorine levels can lead to undesirable taste and odor, and may form harmful byproducts when it reacts with organic matter in the water. Therefore, maintaining the chlorine concentration at or below 4 mg/L is crucial for ensuring safe drinking water while also providing adequate microbial protection.