Drinking Water Supply

Beaverton's Drinking Water Sources

The primary source of filtered drinking water in Beaverton’s service area is the Joint Water Commission (JWC) Water Treatment Plant located south of Forest Grove. The water treatment plant filters surface water pumped from the nearby upper Tualatin River. The water treatment plant can produce up to 75 million gallons a day (mgd) of finished drinking water. The City owns a 25% share in the water treatment plant, allowing the City up to 18.75 mgd of treated water.

About the JWC

The City is a member of the JWC, which is an intergovernmental water supply group whose owner-members include the cities of Beaverton, Hillsboro, Forest Grove, and the Tualatin Valley Water District. The JWC was established to store, manage, treat, and convey drinking water for the owner-member agencies, and it supplies water to as many as 400,000 people.

Beaverton's Water Rights

During the summer, when drinking water demand is high and Tualatin River streamflow is low, water is released from Hagg Lake (Scoggins Reservoir) and Barney Reservoir (formed behind a dam on the Trask River in the Coast Range). The water spilled from the two dams is to compensate for the amount removed from the Tualatin River for Beaverton’s summer use. Water released from Barney Reservoir is diverted by pipes from the Trask River basin into the upper Tualatin River.

The City of Beaverton owns yearly water rights of up to 1.3 billion gallons (4,000 acre-feet) in Scoggins Reservoir and 1.4 billion gallons (4,300 acre-feet) in Barney Reservoir. Water originating from Scoggins Reservoir and Barney Reservoir is the source of most of the City’s raw water (before treatment) during the summer. Release of stored raw water from the two dams increases summertime streamflow in the Tualatin River, helping to sustain a healthy river ecosystem. Every winter and spring, the City uses its 16 mgd natural streamflow water right to meet daily water supply demands. Surface water from the Tualatin River is filtered in the JWC Water Treatment Plant before delivery to the City of Beaverton.

Additional Information

To learn more about the City's line capacities and how the City is able to maintain an adequate water supply even during environmentally stressed summer seasons, view our additional information.