Fluoride is not added to water produced by the City’s groundwater wells or City of Tustin Water Services treatment facilities; however, it is naturally occurring in the groundwater supply and ranges between 0.2 to 0.7 milligrams per liter (“m/L”). The City purchases water from the Metropolitan Water District of Southern California, which adds fluoride to the water during the treatment process.

Fluoride Regulations

The U.S. Environmental Protection Agency (“EPA”) regulates fluoride in drinking water. The maximum level of fluoride deemed acceptable per EPA standards is 4 milligrams per liter. The California Department of Health Services, which specifically regulates the City’s water system, recommends the fluoride levels in drinking water average 1 m/L with the maximum level being 2 milligrams per liter. For additional information about the City’s water supply and water quality, refer to the Annual Water Quality Report.