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The City of Portland, Oregon

Nick Fish (In Memoriam)

City of Portland Commissioner

phone: 503-823-3589


1221 S.W. 4th, Room 240, Portland, OR 97204


July 15, 2015

The Portland Water Bureau works hard throughout the year to provide Portlanders with some of the best drinking water in the nation.

One of the ways the Water Bureau maintains our high quality water is by conducting unidirectional flushing (UDF).

Over time, small bits of sediment and organic matter from the Bull Run Watershed settle and accumulate in the bottom of pipes. Unidirectional flushing forces high-speed water through pipes to remove those sediments. Flushing crews temporarily close valves to isolate sections of pipe, and water is directed through an open fire hydrant.  

Residents near flushing zones may notice discolored water and lower than normal water pressure. The discoloration does not pose a health risk. Residents should let tap water run until it becomes clear.  

Beginning this week, the Water Bureau will flush out water mains in the Powellhurst-Gilbert, Pleasant Valley/Powellhurst-Gilbert, and the Pleasant Valley neighborhoods. Flushing usually occurs Monday – Friday, between 9 am - 3:30 pm.

Check out the Water Bureau’s website for a full map of the flushing zone.