Cucamonga Valley Water District service area, California, USA

The Cucamonga Valley Water District service area spans roughly 47 square miles in western San Bernardino County, California. It includes Rancho Cucamonga and parts of Fontana, Ontario, Upland and unincorporated county land. Its northern edge reaches the foothills of the San Gabriel Mountains. Interstate 15 crosses the eastern portion, while Interstate 210 runs east-west through the northern part of the valley.