As many buildings experienced low- or no-occupancy during the COVID-19 pandemic, stagnant or slow-moving water created conditions to increase the risk of waterborne disease pathogens, such as Legionella bacteria. During this webinar hosted by the NACCHO, speakers from the CDC provided information about waterborne disease pathogens associated with building water systems, highlighting Legionella. Nalco Water, an Ecolab Company, additionally shared strategies and recommendations for managing Legionella risk.