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Four agencies share ownership in the JWC – Cities of Hillsboro , Forest Grove , and 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.