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 continually sampled and tested for contaminants to ensure that health standards are met and that taste, odor, and appearance are optimized.
Our drinking water routinely meets or exceeds the stringent water quality standards set by the U.S. Environmental Protection Agency (EPA) and the State Water Resources Control Board. As required by law, by July 1 each year the City provides its water customers with a summary of any contaminants detected for the previous calendar year.
Find out more about water quality reporting and view current and past issues of our annual Drinking Water Quality Report.