![]() ![]() No single measure can ensure Legionella control. Use a WMP to protect building operators, staff, and visitors from exposure to Legionella in potable water systems. Operation, Maintenance, and Control Limits Consider installing sampling ports throughout your water system in locations to facilitate water parameter monitoring and WMP validation.Use appropriately sized hot and cold water storage tanks fitted with recirculating pumps to maintain flow and avoid unfavorable temperature gradients.Identify water system components that speed the decay of disinfectant residuals (e.g., UV devices, water softeners, carbon filters, heaters).Recognize that low-flow and mechanically complex fixtures (e.g., electronic sensor faucets) can increase the risk of Legionella growth.Install thermostatic mixing valves as close as possible to fixtures to prevent scalding while permitting circulating hot water temperatures above 120☏ (49☌).Eliminate sections of no- or low-water flow called dead legs.Use pipe insulation to maintain hot and cold water temperatures throughout the water system.They should be evaluated from the point at which water enters a facility system to the point where it leaves the system through a fixture or device. The following considerations apply to hot and cold potable water systems. Understanding potable water system design components is critical for Legionella control. ![]()
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