Water Quality

East Valley Water District staff regularly monitors the water system quality. Throughout each year, the District collects over 3,200 water samples and flushes 680 fire hydrants in order to maintain the high quality drinking water supply. 

For More Information

If you are curious about chlorine levels at your house or have questions about water quality, please contact the District’s Water Quality Team at (909) 806-4222.

Water Treatment

East Valley Water District’s primary water quality goal is to protect public health and safety. In order to ensure the water is free of harmful bacteria and other microorganisms, levels of chlorine that meet State and Federal guidelines are added to the water distribution system, which can range from 0.2- 4 parts per million (PPM). 

The District chlorinates all water wells to a target level of 0.8 to 1.2 ppm and tries to maintain storage reservoirs at this chlorine level. We are required to maintain chlorine levels at every point in the water distribution system as proof that the entire system is protected against harmful microorganisms.

Many people are able to taste or smell extremely low concentrations of chlorine in water and may be able to detect the levels we try to maintain in our water system. In order to keep an adequate chlorine residual throughout the water system customers who are located closer to the treatment location may detect some chlorine taste and odor. The District strives to balance the need for ensuring adequate protection for the drinking water against the possibility of customers experiencing chlorine taste and odor.

Water Sources

Drinking water within the District’s service area comes from three difference water sources: groundwater, surface water from the Santa Ana River, and imported water from Northern California. Customers may notice a difference in taste and hardness (mineral and organic content) at different times of year, depending on the water supply in use. This natural variation is a common occurrence with water systems that have the ability to use different water supply sources, and it does not impact the quality of the drinking water.

Annual Reporting

The District provides an annual update to the community on water quality in the Consumer Confidence Report. View the most recent update

  1. Sampling Compliance
  2. Backflow Prevention
  3. Contact Us
  4. Learn More

Consumer Confidence Report

Providing the community with the opportunity to access information about the quality of your drinking water, detected contaminants, and possible health risks is an important job for all water suppliers. State and federal regulations currently in place are very important, and EVWD makes every effort to present this detailed information in a simplified manner. 

The Consumer Confidence Report is made available to all customers each spring. Results found are based on an average of all samples collected throughout the year.

 Most Recent Report | View All Reports

Home Sampling

To ensure the safety of water being delivered to customers, East Valley Water District routinely samples water for harmful contaminants. Sample are collected by the District are representative of the water quality being delivered to customers through the meter. Results from samples may not be representative of the water found in the home as plumbing, treatment equipment and fixtures vary in each home.  

For information regarding home water sampling please contact the Water Quality Department at (909) 806-4222.