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CDC Legionella toolkit

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6 DEVELOPING A LEGIONELLA WATER MANAGEMENT PROGRAM Elements of a Water Management Program Developing and maintaining a water management program is a multi-step, continuous process. The key steps, listed here, are explained in more detail throughout the toolkit with the associated step number appearing on the page where the specific step is discussed. Continuous program review (see below) Establish a water management program team 1 Describe the building water systems using text and flow diagrams 2 Identify areas where Legionella could grow and spread 3 Decide where control measures should be applied and how to monitor them 4 Establish ways to intervene when control limits are not met 5 Make sure the program is running as designed and is effective 6 Document and communicate all the activities 7 Program Review You need to review the elements of your program at least once per year. Make sure you also review and revise your program when any of the following events occur: 6 6 ● ● ● ● ● 6 6 6 6 6 Data review shows control measures are persistently outside of control limits A major maintenance or water service change occurs, such as: New construction Equipment changes (e.g., new hot tub chlorinator pump) Changes in treatment products (e.g., disinfectants) Changes in water usage (e.g., high and low season for hotel) Changes in the municipal water supply One or more cases of disease are thought to be associated with your system(s) Changes occur in applicable laws, regulations, standards, or guidelines If an event triggers you to review and update your water management program, remember to: Update the process flow diagram, associated control points, control limits, and corrective actions Update the written description of your building water systems Train those responsible for implementing and monitoring the updated program Reference: ASHRAE 188: Legionellosis: Risk Management for Building Water Systems June 26, 2015. ASHRAE: Atlanta. www.ashrae.org

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