Fluoridation by Public Water Systems

Is My Water Supply Fluoridated?

If you are served by a water system listed below, the water you receive contains fluoride in the optimal amount needed to improve oral health and reduce dental caries (cavities). Your health care provider may ask you about the level of fluoride in your water.

If you would like more detailed information on your drinking water quality please read the annual Consumer Confidence Report (CCR) issued by your water provider. Contact your water system for a copy of the current CCR or check your water system's webpage.

List of Fully Fluoridated Water Systems - all water is fluoridated

  • Alameda County
    • Alameda County Water District
    • East Bay Municipal Utility District
    • City of Pleasanton
    • Dublin San Ramon Services District
    • City of Hayward
  • Butte County
    • City of Gridley
    • Cal-Water Service Co. (Oroville)
  • Contra Costa
    • Golden State Water Co. (Bay Point)
    • City of Brentwood
  • Fresno
    • City of Fresno
  • Los Angeles
    • Bellflower Somerset Mutual WC
    • Golden State Water Co. (Claremont)
    • City of Glendora
    • Suburban Water Sys. (Glendora)
    • Cal-American WC (Baldwin Hills)
    • Suburban Water Sys. (La Mirada)
    • Orchard Dale Water District
    • City of Paramount
    • City of Covina
    • Cal-American Water Co. (San Marino)
    • Golden State Water Co. (San Dimas)
    • City of Sierra Madre
    • City of Signal Hill
    • Walnut Park Mutual Water Co.
    • Suburban Water Sys (Whittier)
    • City of Burbank
    • Suburban Water Sys. (Covina Knolls)
    • Suburban Water Sys. (San Jose)
    • La Habra Heights County WD
    • Golden State WC (So. San Gabriel)
    • City of Lakewood
    • City of Inglewood
    • City of Pasadena Valley Water Co.
    • City of Norwalk
    • Las Flores Water Co.
    • City of Santa Monica
    • Cal-Water Service Co. (Dominguez)
    • Cal-Water SC (East Los Angeles)
    • City of Hawthorne
    • City of Commerce
    • Cal-Water SC (City of Montebello)
    • Cal-Water SC (Hermosa/Redondo)
    • Rowland Water District
    • City of Santa Fe Springs
  • Napa
    • City of American Canyon
  • Orange
    • City of Newport Beach
    • City of Anaheim
    • City of Brea
    • City of Buena Park
    • Mesa WD [p] (Name change)
    • City of Fullerton
    • City of La Habra
    • Golden State Water Co. (West Orange-Cypress)
    • City of Orange
    • City of San Juan Capistrano
    • Golden State Water Co. (Placentia) of San Clemente
    • Yorba Linda Water District
    • City of Santa Ana
    • City of Seal Beach
    • City of Tustin
    • Golden State WC (Cowan Heights)
    • City of Garden Grove
    • City of Westminster
    • East Orange County WD (Retail Zone)
    • Golden State Water Co. (Yorba Linda)
    • Irvine Ranch Water District
    • Trabuco Canyon Water District
    • City of La Palma
  • Sacramento
    • Sacramento County WA (Laguna/Vineyard)
  • San Diego
    • Yuima Municipal WD (IDA)
    • Yuima Municipal WD
    • Lakeside Water District
    • City of Oceanside
    • Olivenhain Municipal WD
    • Otay Water District
  • Ventura
    • Thermic Mutual Water Co.
    • City of Oxnard
    • Pleasant Valley Mutual Water Co.
    • Ventura CWWD No. 19 (Somis)
    • Ventura CWWD No. 1 (Moorpark)
    • City of Camarillo
    • Crestview Mutual Water Co.
    • Golden State WC (Simi Valley)
    • Camrosa Water District

Water Systems Providing a Mixture of Fluoridated and Non-Fluoridated Water

If your system is listed below the water you receive is a mixture of water from more than one source so that the water contains just a portion of the fluoride needed to improve oral health and reduce dental caries (cavities). Your water supply contains some fluoride that has been added but less than the ideal amount needed to improve oral health.

Your health care provider or dentist may ask you about whether your water supply contains any added fluoride. You should contact your water system for more information.

  • Contra Costa
    • Golden State Water Co. (Bay Point)
    • City of Brentwood
  • Fresno
    • City of Fresno
  • Los Angeles
    • Bellflower Somerset Mutual WC
    • Golden State Water Co. (Claremont)
    • City of Glendora
    • Suburban Water Sys. (Glendora)
    • Cal-American WC (Baldwin Hills)
    • Suburban Water Sys. (La Mirada)
    • Orchard Dale Water District
    • City of Paramount
    • City of Covina
    • Cal-American Water Co. (San Marino)
    • Golden State Water Co. (San Dimas)
    • City of Sierra Madre
    • City of Signal Hill
    • Walnut Park Mutual Water Co.
    • Suburban Water Sys (Whittier)
    • City of Burbank
    • Suburban Water Sys. (Covina Knolls)
    • Suburban Water Sys. (San Jose)
    • La Habra Heights County WD
    • Golden State WC (So. San Gabriel)
    • City of Lakewood
    • City of Inglewood
    • City of Pasadena Valley Water Co.
    • City of Norwalk
    • Las Flores Water Co.
    • City of Santa Monica
    • Cal-Water Service Co. (Dominguez)
    • Cal-Water SC (East Los Angeles)
    • City of Hawthorne
    • City of Commerce
    • Cal-Water SC (City of Montebello)
    • Cal-Water SC (Hermosa/Redondo)
    • Rowland Water District
    • City of Santa Fe Springs
  • Napa
    • City of American Canyon
  • Orange
    • City of Newport Beach
    • City of Anaheim
    • City of Brea
    • City of Buena Park
    • Mesa WD [p] (Name change)
    • City of Fullerton
    • City of La Habra
    • Golden State Water Co. (West Orange-Cypress)
    • City of Orange
    • City of San Juan Capistrano
    • Golden State Water Co. (Placentia) of San Clemente
    • Yorba Linda Water District
    • City of Santa Ana
    • City of Seal Beach
    • City of Tustin
    • Golden State WC (Cowan Heights)
    • City of Garden Grove
    • City of Westminster
    • East Orange County WD (Retail Zone)
    • Golden State Water Co. (Yorba Linda)
    • Irvine Ranch Water District
    • Trabuco Canyon Water District
    • City of La Palma
  • Sacramento
    • Sacramento County WA (Laguna/Vineyard)
  • San Diego
    • Yuima Municipal WD (IDA)
    • Yuima Municipal WD
    • Lakeside Water District
    • City of Oceanside
    • Olivenhain Municipal WD
    • Otay Water District
  • Ventura
    • Thermic Mutual Water Co.
    • City of Oxnard
    • Pleasant Valley Mutual Water Co.
    • Ventura CWWD No. 19 (Somis)
    • Ventura CWWD No. 1 (Moorpark)
    • City of Camarillo
    • Crestview Mutual Water Co.
    • Golden State WC (Simi Valley)
    • Camrosa Water District

2016 Fluoridation Data

Additional Historic Fluoridation Data

Fluoridation - April 2015 Revision to Optimal Fluoride Level

The U.S. Department of Health and Human Services Agency (HHS) is recommending that water systems practicing fluoridation adjust their fluoride content to 0.7 mg/L (parts per million), as opposed to the previous temperature-dependent optimal levels ranging from 0.7 mg/L to 1.2 mg/L. There is no change regarding federal health officials' strong and long-standing support regarding the value of fluoridation of drinking water.

Detailed information on the basis for this change is available via the Centers for Disease Control and Prevention's (CDC's) website. The change in the optimal level is a result of recent scientific evidence in four areas on the subject:

  1. The effectiveness of fluoridation on dental caries prevention and control for all age groups.
  2. The availability of fluoride through other sources
  3. Trends in the prevalence and severity of dental fluorosis
  4. Fluid intake by children across various ambient air temperatures.

This optimal target goal is aimed at providing the benefits of fluoridation while minimizing the chance that children develop dental fluorosis, a typically mild condition that causes a discoloration of teeth.

To reflect CDC’s recommendation, DDW will be consulting with public water systems practicing fluoridation regarding amendments to their individual public water supply permits to reference the CDC's recommended optimal level of 0.7 mg/L. The recommended optimal level of 0.7 mg/L currently corresponds with the existing California Water Fluoridation Standards control range of 0.6 mg/L to 1.2 mg/L. Public water systems are advised of the following:

  • Public water systems practicing fluoridation are advised that they may immediately implement the CDC’s recommended optimal level of 0.7 mg/L and control range of 0.6 ppm to 1.2 ppm.
  • DDW District Offices will issue a letter to each public water system practicing fluoridation by the end of May 2015 and initiate the water supply permit amendment process soon after.
  • DDW will be developing amendments to the California Code of Regulations to incorporate the new CDC recommendation.

Water system practicing fluoridation may contact the local DDW District Office with questions regarding the addition of fluoride to the water supply or the maintenance of optimum fluoride concentrations in the water delivered to customers.

Tooth decay is the number one chronic condition for children. It may result in pain, poor nutrition, and dysfunctional speech, as well as a lack of concentration, poor appearance, low self-esteem and absenteeism. Optimally fluoridated water is the single most cost-effective strategy that a community can take to improve the oral health of its residents. Studies consistently show that water fluoridation reduces tooth decay by 20 to 40 percent. The recommendations of HHS resulted from an updated review of the various current sources of fluoride, including water fluoridation. Providing the optimal level of fluoride protects the dental health of people of all ages, not just children.

DDW is responsible for regulating the activities of fluoridating public water systems in California. This responsibility includes assuring water fluoridation is conducted in a safe and effective manner. Public water systems must obtain a permit from DDW to fluoridate their drinking water supplies and must monitor the fluoride levels in their water system on a daily basis. The operational and monitoring information is also reported to DDW. For copies of the reporting requirements and reporting forms, click on the links below.

Fluoridation and Infant Formula

Concerns have been raised about the use of fluoridated drinking water in infant formula. For more information on this topic, click on the links below.

Fluoridation Management

The fluoridation of public water systems in California by two of its organizations:

  • DDW provides technical and engineering expertise to public water systems for permitting and operating fluoridation systems. DDW is the regulatory agency and responsible for assuring fluoridation systems are optimally fluoridating the water supplies to provide dental health benefits.
  • The Office of Oral Health (OOH) within the Chronic Disease Control Branch, provides scientific, technical, and health related expertise to communities interested in fluoridating their drinking water supplies. OOH is also responsible for securing funds to purchase and install fluoridation equipment for public water systems.

Fluoridation Monitoring and Reporting

Reporting Requirements and Reporting Forms

Required Reporting
Where there are two, choose the correct report form to use
Monthly Distribution Monitoring
Year-to-Date Distribution Summary
Monthly Treatment Summary
Yearly Treatment Summary
Optimal Fluoride Control Range
Calculation (Done Annually)
Annual Cost Summary
Voluntary Fluoridation (Only for
systems that purchase fluoridated
water but do not supplement with
additional fluoride)