What is the maximum allowable combined chlorine level in pool water?

The maximum allowable combined chlorine level in pool water is 0.2 parts per million (ppm). Combined chlorine refers to the chloramines that form when chlorine reacts with organic matter, such as sweat, oils, and other contaminants introduced by swimmers. While free chlorine plays a crucial role in disinfecting and keeping the water safe for users, elevated levels of combined chlorine can lead to issues such as unpleasant odors, eye irritation, and possibly even respiratory problems.

Maintaining combined chlorine levels at or below 0.2 ppm is important for ensuring a safe and pleasant swimming experience. Levels higher than this can indicate that the water is not being adequately sanitized and may require shock treatment or other remediation methods to bring the water chemistry back into balance. This is why 0.2 ppm is set as the standard for safe public swimming pools.