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CDC Legionella toolkit

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14 DEVELOPING A LEGIONELLA WATER MANAGEMENT PROGRAM 4 Decide How to Monitor Your Control Measures EXAMPLE: BUILDING A The diagram below shows which types of monitoring could occur at different locations within Building A's water system to reduce the risk of growth and spread of Legionella. 1. Receiving 2. Cold Water Distribution 3. Heating 4. Hot Water Distribution 5. Waste Municipal Water 4" pipe from Maple St. Fire Suppression (sprinkler system) Cooling Tower Roof Decorative Fountain Lobby Ice Machines Floors 2, 4, 6, 8, 10 Sinks/Showers Floors B–11 Hot Tub Floor 1 Pool Floor 1 Water Heaters #1 & #2: Basement Sinks/ Showers Floors B–5 Sinks/ Showers Floors 6–11 Kitchen Appliances Basement Sanitary Sewer Hot Water Storage Basement Water Heater #3: Basement Kitchen Check Disenfectant Levels Check Temperature Visual Inspection Monitoring at representative fixtures close to and far from the central distribution point is recommended. It is not necessary to routinely monitor water conditions at every tap. WaterFlow Recirculating Return Flow Water Process Backflow Preventer Legend: Reference: ASHRAE 188: Legionellosis: Risk Management for Building Water Systems June 26, 2015. ASHRAE: Atlanta. www.ashrae.org Disclaimer: Example content is provided for illustrative purposes only and is not intended to be relevant to all buildings. Note: In addition to whatever you do to prevent Legionella, state and local regulations may exist that govern the design, construction, operation, and maintenance of public aquatic facilities (e.g., pools and hot tubs). See CDC's Model Aquatic Health Code at www.cdc.gov/mahc/index.html for helpful information, but this document is not a substitute for state and local regulations. Note: Heterotrophic plate counts can aid in your monitoring program as an indicator of water quality, but should not be used as a control measure.

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