What is the maximum allowed level of combined chlorine?

The maximum allowed level of combined chlorine in swimming pools is 0.3 ppm. Combined chlorine, which consists of chloramines formed when chlorine reacts with pollutants such as sweat, urine, and organic matter, can lead to unpleasant odors, skin irritation, and reduced disinfecting effectiveness. By maintaining the level of combined chlorine at or below 0.3 ppm, pool operators can ensure a safer and more pleasant swimming environment for patrons. This standard is widely accepted in public health guidelines and is designed to balance effective sanitation with swimmer comfort. Levels above this threshold may indicate the need for further chlorine treatments or water management efforts to rectify water quality issues.