What is the maximum allowed parts per million (PPM) of chlorine in potable water?

The maximum allowed parts per million (PPM) of chlorine in potable water is set to ensure the safety and health of the public. The correct answer, which indicates 1.5 PPM, aligns with the regulatory standards aimed at maintaining water quality while effectively controlling pathogens.

Chlorine is commonly used as a disinfectant in drinking water to kill harmful bacteria and viruses. However, it is essential to balance the amount of chlorine to avoid adverse health effects while ensuring that the water remains safe for consumption. Regulations have determined that a maximum concentration of up to 1.5 PPM is acceptable, as it effectively reduces the risk of waterborne diseases without posing significant health risks to the population.

Setting the limit at this level ensures that water supplies are adequately treated while minimizing potential chlorination by-products that can arise from higher concentrations of chlorine. Thus, the chosen concentration is a compromise that aims to protect public health while maintaining the disinfection efficacy of treated drinking water.