Did You Know?

Due to prudent financial planning and cost-effective management, Monte Vista Water District's water rates are among the lowest in the region.

Your Water District

Testing water pHEmployee testing the pH levels of your drinking water

Water Monitoring and Treatment


State-of-the-art technologies are used to treat and test the water served to MVWD's customers. To ensure proper disinfection, MVWD adds chlorine in the form of sodium hypochlorite, a chemical similar to household bleach, to the water supply produced by its groundwater wells. The chlorine kills harmful bacteria and viruses that might enter the system via a broken main or well contamination. Treated water from the Agua de Lejos Treatment Plant and the city of Upland distribution system is introduced directly into MVWD's distribution system.

Groundwater produced by MVWD's wells requires very minimal treatment prior to distribution. However, the groundwater basin from which MVWD draws water has areas of high concentrations of nitrates, a salt that at certain levels may pose a health risk to vulnerable populations. One of MVWD's newest wells is equipped with an ion exchange treatment facility that removes nitrates from the pumped groundwater. MVWD also operates a nitrate blending facility that ensures nitrate levels in water entering the distribution system meets drinking water requirements.

MVWD safeguards the distribution system by actively monitoring for 146 contaminants. MVWD collects water samples from sixteen California Department of Public Health-approved locations evenly dispersed throughout our distribution system every week, as well as from each of the District's active wells each month.