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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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Climate variability

The region will experience annual and seasonal climate variability, even as the climate continues to warm over the next several decades (Click image for National Climate Assessment).

Future Northwest climate

Climate models project a warmer future Northwest with drier summers, wetter winters and heavier rainfall during storm events (Click image for Climate Change in the Northwest report).

Meeting future water demand

Portland’s water system is expected to continue meeting customer needs into the future, based on 30-year population and demand projections, and water efficiency.

Planning for summer supply

The Bull Run reservoirs draw down during the late spring or summer, and refill in the fall (Click image for Summer Supply Planning information).

Portland's groundwater supply increases climate resilience

Portland's groundwater supply increases the water system’s resilience to climate change (Click image for groundwater information).

Portland's rain-fed water supply

Portland's drinking water reservoirs in the Bull Run Watershed refill from seasonal rainfall. The water supply is therefore less vulnerable to loss of snow from warming temperatures.

Snow and future stream temperatures

Warmer air temperatures are expected to reduce snowpacks and affect water quality for fish.