Municipal water suppliers deliver water with a halogen disinfectant residual — typically free chlorine or chloramine — but that residual degrades as water travels through a building's distribution system. In large or complex facilities, recirculating domestic hot water systems can see significant residual loss by the time water reaches distal fixtures. Low or absent disinfectant residual creates conditions that favor Legionella amplification and biofilm development.

Supplemental disinfection with monochloramine addresses this directly. By boosting the halogen residual within the building's recirculating hot water system, monochloramine treatment maintains effective disinfectant levels at the point of use — even in large, multi-story, or aging distribution systems where residual decay is most pronounced. Monochloramine is particularly well-suited for this application because it is more stable than free chlorine at elevated temperatures, penetrates biofilm more effectively, and is less reactive with organic matter in the system.

RW Water Services designs, installs, and maintains supplemental disinfection systems tailored to each facility's water quality, system configuration, and regulatory requirements. Our programs include ongoing monitoring of disinfectant residuals, water quality testing, and system adjustments to ensure consistent, effective protection throughout the distribution system.