District Overview

General Information

Formed on July 10, 1952, the Walnut Valley Water District, a California Water District, is located approximately 20 miles east of Los Angeles in the San Gabriel Valley, encompassing an area of approximately 29 square miles with over 26,000 service connections serving more than 100,000 multi-use customers in six communities. The District's present service area includes all of the city of Diamond Bar, portions of the cities of Industry, Pomona, Walnut, and West Covina, and the easterly section of the unincorporated area of Rowland Heights.


Population in Service Area 102,622
Total Acreage in Service Area 17,900
Number of Active Water Services 26,836
Number of Reservoirs 28
Number of Booster Pump Stations 16
Total Gallons of Water Storage 88.9 million
Number of Pressure Regulating Stations 37
Total Distance of Water Mains in System (Miles) 376
Water Quality Analyses Performed Yearly 17,000
Average Annual Water Deliveries (Gallons) 5.4 billion
Average Water System Daily Use (Gallons) 14.8 million
Average Daily Use Per Person (Gallons) 144


271 S. Brea Canyon Road
Walnut, California 91789
(909) 595-1268    
(626) 964-6551
Monday-Thursday 7am-5pm
Friday 7am - 4pm