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 Treatment Plant is the largest conventional treatment plant in Oregon and produces drinking water of exceptionally high-quality. The drinking water continues to meet and exceed all minimum compliance standards set by the Environmental Protection Agency’s (EPA) Safe Drinking Water Act. 

The Water Treatment Plant was built in 1976 by Hillsboro and Forest Grove. The original plant could treat up to 21.3 Million Gallons per Day (MGD). It has been expanded through the years to accommodate the addition of Beaverton and TVWD, as well as population growth. The Water Treatment Plant is now capable of treating up to 75 MGD.


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