Fluoride in Colorado well water
In Colorado, 3% of 9,605 tested private well samples exceeded the EPA limit for fluoride (4 mg/L).
Natural fluoride in bedrock wells can exceed the limit. Above 4 mg/L long-term exposure causes skeletal fluorosis; above 2 mg/L children can develop tooth mottling.
Check your fluoride number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Test your Colorado well for fluoride
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
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Systems that remove fluoride
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Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For fluoride
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For fluoride
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.
Where to get a well tested for fluoride in Colorado: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit (4 mg/L); counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Rio Blanco | 390 | 99% | 3.3 | 95 mg/L | |
| Montezuma | 49 | 92% | 1.37 | 11.2 mg/L | |
| Garfield | 80 | 100% | 0.685 | 11 mg/L | |
| Chaffee | 101 | 99% | 0.7 | 17 mg/L | |
| Alamosa | 157 | 100% | 0.5 | 20 mg/L | |
| La Plata | 270 | 100% | 0.695 | 8.8 mg/L | |
| Las Animas | 70 | 100% | 0.75 | 6.2 mg/L | |
| Saguache | 92 | 97% | 0.4 | 6 mg/L | |
| Delta | 71 | 94% | 0.7 | 5.4 mg/L | |
| Boulder | 151 | 99% | 0.6 | 43 mg/L | |
| Moffat | 98 | 100% | 0.5 | 9.3 mg/L | |
| Grand | 147 | 91% | 0.22 | 18 mg/L | |
| Eagle | 118 | 92% | 0.13 | 8.9 mg/L | |
| Prowers | 64 | 100% | 0.9 | 4.2 mg/L | |
| Kiowa | 66 | 100% | 1.65 | 5.3 mg/L |
- Meeker CCD, Rio Blanco County47% of 366
- West Garfield CCD, Garfield County24% of 33
- Ute Mountain CCD, Montezuma County23% of 39
- Platteville CCD, Weld County15% of 61
- Buena Vista CCD, Chaffee County15% of 41
- Mosca-Hooper CCD, Alamosa County11% of 114
- Durango Southwest CCD, La Plata County9% of 77
- Ignacio CCD, La Plata County7% of 123
- Keenesburg-Hudson CCD, Weld County7% of 56
- Salida CCD, Chaffee County7% of 60
- Weston CCD, Las Animas County6% of 35
- Boulder CCD, Boulder County6% of 53
- Lake George CCD, Park County5% of 128
- Alamosa CCD, Alamosa County5% of 43
- Eagle-Gypsum CCD, Eagle County4% of 48
- Saguache CCD, Saguache County3% of 58
- Pagosa Springs CCD, Archuleta County3% of 30
- Center CCD, Saguache County3% of 32
- Granby CCD, Grand County2% of 122
- Craig CCD, Moffat County2% of 85
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. fluoride counts and shares are listed on each county and town page with their sources.