The Cucamonga Valley Water District is a retail water provider in the City of Rancho Cucamonga. It currently serves nearly 20 ... 0,000 customers in the city of Rancho Cucamonga, and portions of Fontana, Ontario, and Upland, as well as some unincorporated San Bernardino County (as of 2014). CVWD employs 120 employees who import, treat, and manage the District's water supply. Additionally, CVWD maintains the sewer lines throughout it's service area. Follow us on www.facebook.com/CVWDWater read more