Drinking water in the Otay Water District’s service area is fluoridated. The District does not add fluoride to the water supply. Rather, it purchases treated drinking water from area water wholesalers. Water wholesalers in San Diego County supplement the existing fluoride in the water supply raising it to approximately 0.8 parts per million (ppm), the level recommended by public health officials for optimal dental health.
Most water in San Diego County comes from the Colorado River or the Sierra snowpack. As water passes over the surface of the earth, it picks up fluoride through the natural erosion process. Fluoride is naturally present in the water at approximately 0.2 ppm, with a range of 0.1 to 0.4 ppm.
We encourage customers taking or who are considering taking fluoride supplements to consult their medical or dental health care professional. For more information about fluoride in the water supply, please click on Fluoridation on the Water Sources pull down menu.