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Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.


1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Seasonal Water Supply Planning

  • Bull Run Reservoirs Store 9.9 Billion Gallons of Drinking Water.

  • Portland's secondary source of high quality groundwater can be used to supplement summer demand when needed

Each year, the Portland Water Bureau develops a Seasonal Water Supply Augmentation and Contingency Plan. This plan evaluates the availability of water from the Bull Run and groundwater sources, projected weather forecasts, and water demands to guide management of the drinking water system. Between careful management and the region’s strong conservation efforts, PWB is prepared to meet the range of potential supply and demand conditions that could occur in the Portland water system this season.


August 16, 2016 Update: There are 7.6 billion gallons, or about 76% of usable storage in the Bull Run Reservoirs. This is above the historic average and above the amount of storage available at this time in 2015.

From Monday, July 25 through Wednesday August 10, the Portland Water Bureau blended a small portion of water from its Columbia South Shore Well Field with water from the Bull Run Watershed as part of an annual maintenance operation. This operation ensures the reliability of the complex groundwater system when needed, either in an emergency or to meet seasonal supply demands.


Water Efficiency Information

Information about ways to use water wisely.