JWC Members

Four agencies share ownership in the Joint Water Commission including: Cities of Hillsboro, Forest Grove, Beaverton and the Tualatin Valley Water District (TVWD). All of the agencies serve areas in Washington County and have varying water source supplies and levels of ownership in the Joint Water Commission.

The City of Hillsboro is located in central Washington County with a population of approximately 97,000, of which it serves water to approximately 85,000. The other 12,000 live east of Cornelius Pass Road and receive water service from TVWD. This fast-growing area has its roots as an agricultural community, but in recent years has attracted enough business and high-tech industry to earn the nickname the “Silicon Forest.” The City of Hillsboro also serves rural western Washington County with a slow-sand filter plant on the upper Tualatin River.

The City of Forest Grove, in western Washington County, is the smallest of the member agencies with a population of approximately 23,500. Forest Grove’s economy is largely based on surrounding agriculture and Pacific University. Forest Grove also has its own treatment plant on Clear Creek.  Forest Grove was Hillsboro’s original partner when the Joint Water Commission first formed in 1976.

The City of Beaverton is located in eastern Washington County and has a population of approximately 94,500. Its economy is largely based on electronics and light industry. They provide water service to about 70,000 customers, with the remainder served by TVWD, West Slope Water District and Raleigh Water District. Beaverton has actively developed Aquifer Storage and Recovery (ASR) technology in the last few years and has three active ASR wells. These wells are filled with JWC water in the winter months when supplies are ample and then used to supplement summer supply when demands increase due to outdoor water use.

Tualatin Valley Water District is one of the largest water providers in Oregon. The District encompasses more than 45 square miles and includes portions of the cities of Beaverton, Hillsboro, Tigard and unincorporated Washington County. In addition to the JWC, TVWD purchases a portion of its water from the City of Portland. Water supplied from Portland comes from the Bull Run Watershed and the Columbia South Shore Wellfield.  TVWD’s entire populations is over 215,000 customers, with about 175,500 receiving water from the JWC water system.