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 County
City of Antioch
Contra Costa Water District (Bollman)
City of Martinez
Diablo Water District
City of Pittsburg
Contra Costa Water District (Randall-Bold)
Fresno County
City of Coalinga
Jacoby Creek Co. WD
City of Arcata
City of Eureka
Los Angeles County
Golden State WC (Bell, Bell Garden) [p]
Golden State WC (Willowbrook) [p]
Golden State WC (Florence/Graham)
Golden State Water Co. (Norwalk)
Golden State WC (Hollydale)
Golden State Water Co. (Southwest)
City of Torrance
Foothill Municipal Water District
City of Long Beach
City of Lomita
City of Los Angeles (LADWP)
City of Beverly Hills
Liberty Utilities (Lynwood/Rancho Dominguez)
Liberty Utilities (Norwalk/Bellflower)
Cal-Water Service Co. (Palos Verdes)
Marin County
Marin Municipal Water District
Merced County
City of Los Banos
City of Merced
Orange County
Laguna Beach County Water District
South Coast Water Dist. (South Coast)
South Coast WD (Capistrano Beach)
Joint Regional Water Supply Sys.
Moulton Niguel Water District
El Toro Water District
East Orange County WD (Wholesale Zone)
Santa Margarita Water District
City of Huntington Beach
City of Fountain Valley
Placer County
Placer CWA - (Bianchi Estates)
Cal-American Water Co. (West Placer)
City of Roseville - West Train
Riverside County
City of Perris
Western MWD - Murrieta Division
Western MWD
Western MWD (ID A - Rainbow)
Sacramento County
Sacramento County WA (Mather-Sunrise
Sacramento County WA (Arden Park Vista)
Sacramento Suburban Water District -
Cal-American Water Co. (Suburban)
Cal-American Water Co. (Parkway)
City of Sacramento
Cal-American Water Co. (Arden)
San Diego County
City of San Diego
Vallecitos Water District
Carlsbad MWD
Fallbrook Public Utility District
Olivenhain MWD
Rainbow MWDistrict
Rincon Del Diablo MWD (ID-1)
Ramona Municipal Water District
Valley Center Municipal WD
Vista Irrigation District
Padre Dam Municipal WD
San Francisco County
San Francisco International Airport
San Francisco Public Utility Comm. SFWS
Treasure Island
San Francisco Regional Water Sys.
Presidio of San Francisco
San Luis Obispo County
City of San Luis Obispo
San Mateo County
Mid-Peninsula Water District
City of Brisbane
City of Burlingame
Guadalupe Valley MID
Cal-Water Service Co. (San Carlos)
Cal-Water Service Co. (San Mateo)
Skyline County Water District
City of Hillsborough
City of Menlo Park
City of Millbrae
Estero MID
City of Redwood City
City of East Palo Alto
North Coast County WD
Westborough County WD
City of Daly City
Santa Barbara County
City of Santa Maria
Vandenberg Air Force Base
Santa Clara County
City of Palo Alto
Stanford University
City of San Jose (NSJ/Alviso)
Purissima Hills WD
City of Mountain View
City of San Jose (Evergreen)
Solano County
City of Benicia
City of Fairfield
City of Vallejo
City of Vacaville
City of Vallejo (Travis AFB WTP)
Travis Air Force Base
Sonoma County
City of Healdsburg
Sutter County
City of Yuba City
Ventura County
Solano Verde Mutual Water Co.
Academy Mutual Water Co.
Brandeis Bardin Institute
Ventura CWWD No. 17 (Bell Canyon)
City of Port Hueneme
Cal-Water Service Co. (Westlake)
City of Thousand Oaks
Ventura CWWD No. 8 (Simi Valley)
Channel Islands Beach CSD
Cal-American WC (Village District)
Oak Park Water Service
Calleguas MWD
Lake Sherwood CSD
Cal-American WC (Las Posas Estates)
Point Mugu Naval Base
Port Hueneme Naval Base
USN - Camarillo Housing
Port Hueneme Water Agency
Yolo County
City of West Sacramento
Yuba County
Beale Air Force Base

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
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
City of American Canyon
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 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
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)