The City of Napa is committed to providing a safe and reliable supply of drinking water that meets all State and Federal health standards. The Water Division's three treatment plants transform raw source water into clean and safe drinking water using three basic steps - sedimentation, filtration, and disinfection. The water supply is continuously sampled and tested for contaminants to ensure that health standards are met and that taste, odor, and appearance are optimized.
Reporting a Problem
Before reporting a problem, please note whether your concern is with color, taste, odor, or something other, and be prepared to answer the following questions:
Call Water Division staff at 707-257-9521.
Annual Quality Report
To protect the public water mains from potential contamination by non-potable "used water" that could be drawn in during a sudden pressure drop, the City requires installation of a backflow prevention device on new services. The device must be approved by the California Department of Public Health (CDPH). To see the current list of approved backflow prevention devices, stop by the Water Division's 1340 Clay Street office, or call the CDPH Drinking Water Program directly at 916-449-5600 to request a copy. To minimize the visual impact of these devices, consult City of Napa Backflow Screening Guidelines.
All installed devices must be tested annually and immediately repaired if necessary.