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The Water Facilities Authority (Authority) is a Joint Powers Authority governed by its member agencies: Chino, Chino Hills, Monte Vista Water District, Ontario, and Upland. Its service area covers approximately 135 square miles within the upper Santa Ana River watershed. The Authority owns and operates an 81-millon gallons per day surface water treatment plant called Agua de Lejos Treatment Plant, which began operations in 1988 and is located in the City of Upland. This treatment plant treats and disinfects imported water supplies from the state water project. Through its members, the Authority serves nearly 500,000 people in the west-end of San Bernardino County.