Welcome to the Joint Water Commission

Joint Water Commission Water Treatment Plant 4475 SW Fern Hill Road Forest Grove, OR 97116

The Joint Water Commission (JWC) is the primary drinking water supplier in Washington County, Oregon, and is responsible for treating, transmitting, and storing potable water for more than 365,000 customers.

Four agencies share ownership in the JWC – Cities of Hillsboro, Forest Grove, Beaverton and the Tualatin Valley Water District (TVWD).  The JWC also wholesales water to the City of North Plains.

The JWC water supply comes from two surface water sources: the Tualatin River including its tributaries Sain Creek and Scoggins Creek, and the Middle For of the North Fork of the Trask River. In addition to diverting water directly from these sources, in the summer months the JWC uses water from storage supplies in Barney Reservoir, on the Middle Fork of the North Fork of the Trask River, and Scoggins Reservoir (Hagg Lake) on Scoggins Creek, a tributary of the Tualatin River. The JWC obtains water from the Tualatin River through the Spring Hill Intake south of Forest Grove. Water is then treated at the JWC Water Treatment Plant located at 4475 SW Fern Hill Road.

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