"The temporary shutdown or reduced operation of a building and reductions in normal water use can create hazards for returning occupants. Two potential microbial hazards that should be considered prior to reopening after a period of building inactivity are mold and Legionella (the cause of Legionnaires’ disease). For mold, a “prolonged period” may be days, weeks, or months depending upon building-specific factors, season, and weather variables. For Legionella, a “prolonged period” may be weeks or months depending on plumbing-specific factors, disinfectant residuals, water heater temperature set points, water usage patterns, and preexisting Legionella colonization. For more information, please see the link below for the CDC’s updated guidance webpage:
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