For months, many businesses, buildings, and facilities have remained closed during the COVID-19 outbreak. The temporary shutdowns have likely resulted in a reduction of normal water use in the buildings, which can create dangerous conditions for returning occupants, as States are reopening their local economies. One microbial hazard businesses should consider when planning their reopening is Legionella. Legionella bacteria causes Legionnaires’ disease, a serious type of pneumonia. It is found naturally in freshwater environments, but can grow and multiply in common, human-made water systems like hot tubs, spas, showerheads, decorative fountains and water features, large plumbing systems, and cooling towers…