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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Real EPA measurements of fluoride for California water systems — Six-Year Review compliance samples 2012–2019 (historical). Methodology
Every California system with a fluoride result in EPA's data, sorted by level. Averages of 2012–2019 finished-water samples, non-detects counted as zero — historical, not today's tap.
| City | Level | Period | EPA Limit | % of Limit | Status |
|---|---|---|---|---|---|
| Palm DesertGrade A | 0.947 mg/LAverage of 6 samples | 2012–2019 | 4.00 mg/L | 23.7% | Safe |
| FremontGrade A | 0.862 mg/LAverage of 133 samples | 2012–2019 | 4.00 mg/L | 21.6% | Safe |
| Santa MariaGrade A | 0.782 mg/LAverage of 73 samples | 2012–2019 | 4.00 mg/L | 19.6% | Safe |
| FairfieldGrade D | 0.779 mg/LAverage of 65 samples | 2012–2019 | 4.00 mg/L | 19.5% | Safe |
| VallejoGrade A | 0.771 mg/LAverage of 7 samples | 2012–2019 | 4.00 mg/L | 19.3% | Safe |
| Mountain ViewGrade A | 0.760 mg/LAverage of 1 samples | 2012–2019 | 4.00 mg/L | 19.0% | Safe |
| VacavilleGrade C | 0.753 mg/LAverage of 52 samples | 2012–2019 | 4.00 mg/L | 18.8% | Safe |
| AlhambraGrade A | 0.744 mg/LAverage of 160 samples | 2012–2019 | 4.00 mg/L | 18.6% | Safe |
| OaklandGrade A | 0.740 mg/LAverage of 958 samples | 2012–2019 | 4.00 mg/L | 18.5% | Safe |
| SacramentoGrade C | 0.742 mg/LAverage of 16 samples | 2012–2019 | 4.00 mg/L | 18.5% | Safe |
| ConcordGrade A | 0.736 mg/LAverage of 47 samples | 2012–2019 | 4.00 mg/L | 18.4% | Safe |
| Yuba CityGrade A | 0.729 mg/LAverage of 96 samples | 2012–2019 | 4.00 mg/L | 18.2% | Safe |
| West SacramentoGrade D | 0.729 mg/LAverage of 46 samples | 2012–2019 | 4.00 mg/L | 18.2% | Safe |
| PasadenaGrade A | 0.710 mg/LAverage of 4 samples | 2012–2019 | 4.00 mg/L | 17.8% | Safe |
| AntiochGrade A | 0.708 mg/LAverage of 26 samples | 2012–2019 | 4.00 mg/L | 17.7% | Safe |
| EscondidoGrade A | 0.698 mg/LAverage of 115 samples | 2012–2019 | 4.00 mg/L | 17.5% | Safe |
| TemeculaGrade C | 0.677 mg/LAverage of 652 samples | 2012–2019 | 4.00 mg/L | 16.9% | Safe |
| La MesaGrade A | 0.673 mg/LAverage of 92 samples | 2012–2019 | 4.00 mg/L | 16.8% | Safe |
| Los AngelesGrade A | 0.660 mg/LAverage of 7116 samples | 2012–2019 | 4.00 mg/L | 16.5% | Safe |
| YucaipaGrade F | 0.660 mg/LAverage of 1 samples | 2012–2019 | 4.00 mg/L | 16.5% | Safe |
| HawthorneGrade A | 0.657 mg/LAverage of 281 samples | 2012–2019 | 4.00 mg/L | 16.4% | Safe |
| RosevilleGrade A | 0.633 mg/LAverage of 3 samples | 2012–2019 | 4.00 mg/L | 15.8% | Safe |
| Lake ElsinoreGrade A | 0.626 mg/LAverage of 16 samples | 2012–2019 | 4.00 mg/L | 15.7% | Safe |
| EncinitasGrade A | 0.608 mg/LAverage of 31 samples | 2012–2019 | 4.00 mg/L | 15.2% | Safe |
| Fountain ValleyGrade A | 0.605 mg/LAverage of 22 samples | 2012–2019 | 4.00 mg/L | 15.1% | Safe |
Showing 25 of 71 cities. View individual city pages for detailed reports.
While fluoride at low levels is added to prevent tooth decay, excessive exposure can cause problems. Dental fluorosis causes white spots on teeth in children. Skeletal fluorosis from long-term exposure to very high levels can cause joint stiffness and bone damage. Studies have suggested potential links between high fluoride levels and thyroid function issues.
Water additive for dental health; erosion of natural deposits; discharge from fertilizer factories
Based on our analysis of EPA Safe Drinking Water Information System (SDWIS) data and local water utility reports,fluoride has been detected in 71 California water systems. The average level across all tested cities is 10% of the EPA Maximum Contaminant Level (MCL), with the highest detection at 23.7% of the limit.
The EPA MCL for fluoride is 4.0 mg/L, with a secondary standard of 2.0 mg/L. The EPA MCL for fluoride is 4 mg/L. This limit is set to protect public health based on available scientific evidence about the contaminant's health effects.
71 California cities have fluoride detected in their water supply. All tested cities are within EPA safety limits.
Dental fluorosis (tooth discoloration), skeletal problems at high levels, potential thyroid effects. The most vulnerable groups include children during tooth development and people with kidney disease.
The most effective methods for removing fluoride include Reverse Osmosis, Distillation, Activated Alumina. Look for filters certified by NSF/ANSI for fluoride reduction.
The EPA Maximum Contaminant Level (MCL) for fluoride is 4 mg/L.The EPA MCL for fluoride is 4.0 mg/L, with a secondary standard of 2.0 mg/L.
This page shows what California utilities reported for fluoride. It cannot tell you what is coming out of your own tap: utility samples are taken across a whole system and averaged, levels vary by address and season, and anything picked up after the water leaves the main never appears in their report.
Home water test kitscheck your own tap before buying any filterRecommended filtration methods for fluoride removal:
Removes 90-95% of fluoride
Very effective
Specifically designed for fluoride
Paid links. We earn a commission if you buy, at no extra cost to you. Filters are matched to the removal methods listed above for fluoride.