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The City of Portland, Oregon

Portland Water Bureau

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

Customer Service: 503-823-7770


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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, the Water Bureau is prepared to meet the range of potential supply and demand conditions that could occur in the Portland water system this season.

The 2018 summer supply season saw dry spring weather and above average temperatures that resulted in an unusually early start to reservoir drawdown. The early start to drawdown along with available long-term weather forecasts predicting a hot and dry summer resulted in the Portland Water Bureau supplementing the Bull Run drinking water supply with groundwater from the Columbia South Shore Well Field from June 20 through October 17 at an approximate blend of 25–50% groundwater to Bull Run. Precipitation in late October began refilling the reservoirs, ending the summer supply season.

Water Efficiency Information

Information about ways to use water wisely.