Fluoride in North Dakota well water
In North Dakota, 4% of 13,929 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 North Dakota 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 North Dakota: 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 |
|---|---|---|---|---|---|
| Adams | 102 | 100% | 2.7 | 14 mg/L | |
| Billings | 156 | 99% | 2.75 | 12 mg/L | |
| McKenzie | 247 | 100% | 0.8 | 8.9 mg/L | |
| Mercer | 202 | 100% | 0.5 | 6.3 mg/L | |
| Stark | 210 | 99% | 0.9 | 73 mg/L | |
| Grant | 125 | 100% | 2.62 | 15 mg/L | |
| Sargent | 273 | 99% | 0.2 | 9.3 mg/L | |
| Dunn | 424 | 100% | 0.8 | 11 mg/L | |
| Slope | 172 | 100% | 0.75 | 10 mg/L | |
| Hettinger | 179 | 99% | 1 | 6.8 mg/L | |
| Bowman | 702 | 100% | 1.2 | 64 mg/L | |
| Morton | 409 | 100% | 1.1 | 7.6 mg/L | |
| Richland | 180 | 100% | 0.4 | 8.1 mg/L | |
| Golden Valley | 165 | 99% | 0.7 | 6.5 mg/L | |
| Wells | 107 | 98% | 0.2 | 6.7 mg/L |
- Southwest McKenzie UT, McKenzie County41% of 41
- South Billings UT, Billings County34% of 70
- East Stark UT, Stark County32% of 37
- West Grant UT, Grant County30% of 30
- Central McKenzie UT, McKenzie County27% of 44
- North Billings UT, Billings County25% of 84
- Buena Vista township, Bowman County24% of 38
- Killdeer UT, Dunn County19% of 109
- Dickinson North UT, Stark County17% of 42
- West Mercer UT, Mercer County16% of 130
- East Mercer UT, Mercer County15% of 46
- East Grant UT, Grant County14% of 43
- West Morton UT, Morton County13% of 165
- Fischbein township, Bowman County10% of 418
- South Dunn UT, Dunn County8% of 93
- West Stark UT, Stark County7% of 114
- Halliday UT, Dunn County6% of 127
- Jackson township, Sargent County6% of 33
- North McKenzie UT, McKenzie County5% of 40
- Northeast Slope UT, Slope County4% of 55
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.