Reopening Commercial Buildings After COVID-19 Closures

Water quality within commercial buildings that have been vacant or have seen little use during the pandemic restrictions may be impacted as a result of low flow or stagnant water in pipes.

Stagnant water in pipes can create conditions that favor the growth and spread of Legionella and other harmful bacteria, result in lower chlorine levels in buildings, and/or result in increased lead and copper levels that can leach out of building pipes and fixtures.

Building owners or tenants should take the following actions to reduce these risks:  

• Flush your water pipes. The goal is to refresh all the water in the building pipes with fresh water from the water mains underneath the street. The Oregon Health Authority offers guidance on flushing.

• Check your hot water system. Set your hot water heater at 120 degrees F. When flushing hot water taps, run the water until it reaches its highest temperature.

• Take steps before reopening. Follow the CDC's 8 steps to take before your business or building reopens.  Make sure you use personal protective equipment when performing building maintenance.  

Hot tubs, pools and cooling towers

The Centers for Disease Control offer additional guidance for buildings with pools, hot tubs and cooling towers. Read CDC Guidance for Building Water Systems to learn more.