Water held unused in building pipes while businesses or activities are shut down or have unused floors or sections becomes stagnant. Conditions may develop increasing the risk for the growth and spread of waterborne bacteria, such as Legionella or biofilm, in the building piping. Disinfectant in the water, such as chlorine, will likely dissipate or become undetectable. Actions are necessary to ensure the water in the building is safe as well as taste and odor free before resumption of normal water use. There are some precautionary actions that can be taken to minimize water quality complaints when your business reopens. The building plumbing, including water heaters, should be thoroughly flushed before reopening for normal use. Thorough flushing includes operating all sink, tub, shower and toilet fixtures. Safety equipment, such as eye washes, safety showers and fire sprinkler systems may also require assessment and necessary maintenance. Water features inside buildings, hot tubs/spas and cooling towers also can require attention The Center for Disease Control CDC) has very detailed information on reactivating plumbing systems after dormant conditions on its website at: https://www.cdc.gov/coronavirus/2019-ncov/php/building-water-system.html.