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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 Colorado water systems — Six-Year Review compliance samples 2012–2019 (historical). Methodology
Every Colorado 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 |
|---|---|---|---|---|---|
| FountainGrade A | 1.76 mg/LAverage of 11 samples | 2012–2019 | 4.00 mg/L | 44.1% | Safe |
| ParkerGrade C | 0.966 mg/LAverage of 51 samples | 2012–2019 | 4.00 mg/L | 24.2% | Safe |
| PuebloGrade A | 0.819 mg/LAverage of 32 samples | 2012–2019 | 4.00 mg/L | 20.5% | Safe |
| Castle RockGrade B | 0.802 mg/LAverage of 31 samples | 2012–2019 | 4.00 mg/L | 20.1% | Safe |
| Commerce CityGrade A | 0.776 mg/LAverage of 264 samples | 2012–2019 | 4.00 mg/L | 19.4% | Safe |
| AuroraGrade A | 0.758 mg/LAverage of 38 samples | 2012–2019 | 4.00 mg/L | 18.9% | Safe |
| BrightonGrade D | 0.740 mg/LAverage of 18 samples | 2012–2019 | 4.00 mg/L | 18.5% | Safe |
| BroomfieldGrade B | 0.699 mg/LAverage of 15 samples | 2012–2019 | 4.00 mg/L | 17.5% | Safe |
| LovelandGrade A | 0.667 mg/LAverage of 4 samples | 2012–2019 | 4.00 mg/L | 16.7% | Safe |
| Fort MorganGrade A | 0.665 mg/LAverage of 13 samples | 2012–2019 | 4.00 mg/L | 16.6% | Safe |
| LafayetteGrade A | 0.656 mg/LAverage of 12 samples | 2012–2019 | 4.00 mg/L | 16.4% | Safe |
| GreeleyGrade A | 0.648 mg/LAverage of 26 samples | 2012–2019 | 4.00 mg/L | 16.2% | Safe |
| ThorntonGrade D | 0.638 mg/LAverage of 11 samples | 2012–2019 | 4.00 mg/L | 16.0% | Safe |
| ErieGrade A | 0.630 mg/LAverage of 30 samples | 2012–2019 | 4.00 mg/L | 15.8% | Safe |
| Grand JunctionGrade A | 0.631 mg/LAverage of 40 samples | 2012–2019 | 4.00 mg/L | 15.8% | Safe |
| ArvadaGrade A | 0.627 mg/LAverage of 44 samples | 2012–2019 | 4.00 mg/L | 15.7% | Safe |
| Fort CollinsGrade A | 0.622 mg/LAverage of 24 samples | 2012–2019 | 4.00 mg/L | 15.6% | Safe |
| DenverGrade A | 0.615 mg/LAverage of 256 samples | 2012–2019 | 4.00 mg/L | 15.4% | Safe |
| GoldenGrade A | 0.605 mg/LAverage of 11 samples | 2012–2019 | 4.00 mg/L | 15.1% | Safe |
| EnglewoodGrade C | 0.591 mg/LAverage of 15 samples | 2012–2019 | 4.00 mg/L | 14.8% | Safe |
| BoulderGrade A | 0.584 mg/LAverage of 47 samples | 2012–2019 | 4.00 mg/L | 14.6% | Safe |
| LongmontGrade A | 0.586 mg/LAverage of 4 samples | 2012–2019 | 4.00 mg/L | 14.6% | Safe |
| WestminsterGrade A | 0.551 mg/LAverage of 16 samples | 2012–2019 | 4.00 mg/L | 13.8% | Safe |
| Colorado SpringsGrade A | 0.514 mg/LAverage of 39 samples | 2012–2019 | 4.00 mg/L | 12.8% | Safe |
| NorthglennGrade A | 0.473 mg/LAverage of 8 samples | 2012–2019 | 4.00 mg/L | 11.8% | Safe |
Showing 25 of 27 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 27 Colorado water systems. The average level across all tested cities is 17% of the EPA Maximum Contaminant Level (MCL), with the highest detection at 44.1% 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.
27 Colorado 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 Colorado 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.