The Source of Your Water

The water system in Pomona is truly remarkable, with an extensive infrastructure that includes over 30,000 different service connections, as well as 38 wells that provide potable water, 22 water storage reservoirs, which help to ensure that there is always enough water available for local residents. And a total length of 421 miles of water pipelines. The state ranked both our treatment and distribution systems as one of the most complex in all of California.

Ground Water

The City of Pomona relies heavily on its two groundwater aquifers, for our water supply. Our wells are located throughout Pomona and Claremont and are treated at various facilities to remove volatile organic compounds, nitrate, and perchlorate, ensuring that the water we provide is safe for consumption.

Surface Water

A Small percentage of our water comes from surface water. That source of supply comes from the San Gabriel Mountains. This water is filtered and disinfected at the Frank G. Pedley Memorial Filtration in Claremont. The San Antonio Canyon is the route that this water takes before it undergoes the thorough filtration and disinfection processes.

Imported Water

Another water source is from Imported water that come from two separate water districts. The Metropolitan Water District of Southern California (MWD) and the Three Valley's Municipal Water District (TVMWD). Both MWD and TVMWD source their water from Northern California. MWD transports the water to the Weymouth Water Treatment Plant in La Verne for treatment and disinfection, while TVMWD treats its water at the Miramar Water Treatment Plant in Claremont.