Fluoride in South Dakota well water
In South Dakota, 3% of 7,234 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 South 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 South 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 |
|---|---|---|---|---|---|
| Marshall | 138 | 100% | 0.4 | 9.3 mg/L | |
| Kingsbury | 78 | 99% | 0.95 | 8.6 mg/L | |
| Haakon | 54 | 100% | 3.2 | 6.4 mg/L | |
| Day | 81 | 100% | 0.4 | 10.2 mg/L | |
| Brown | 363 | 98% | 0.4 | 44 mg/L | |
| Dewey | 67 | 99% | 0.4 | 4.8 mg/L | |
| Clark | 193 | 99% | 0.3 | 15 mg/L | |
| Roberts | 166 | 98% | 0.255 | 5,000 mg/L | |
| Grant | 64 | 98% | 0.4 | 6 mg/L | |
| Hamlin | 144 | 99% | 0.3 | 5.8 mg/L | |
| Mellette | 97 | 92% | 0.4 | 4.6 mg/L | |
| Harding | 52 | 98% | 0.5 | 9,520 mg/L | |
| Ziebach | 55 | 100% | 0.7 | 5.2 mg/L | |
| Jones | 34 | 100% | 2.8 | 4.3 mg/L | |
| Sully | 37 | 100% | 2.3 | 4.4 mg/L |
- Central Mellette UT, Mellette County5% of 43
- East Oglala Lakota UT, Oglala Lakota County3% of 36
- West Corson UT, Corson County2% of 47
- North Campbell UT, Campbell County2% of 50
- West Butte UT, Butte County2% of 55
- Southwest Meade UT, Meade County1% of 85
- Central Pennington UT, Pennington County<1% of 107
- North Lawrence UT, Lawrence County<1% of 109
- Brookings, Brookings County0% of 61
- Rapid City, Pennington County0% of 109
- Belle Fourche-Cheyenne Valleys UT, Meade County0% of 51
- Edison township, Minnehaha County0% of 150
- Dell Rapids township, Minnehaha County0% of 37
- West Hughes UT, Hughes County0% of 39
- West Todd UT, Todd County0% of 79
- Bowdle township, Edmunds County0% of 30
- Clark, Clark County0% of 36
- South Campbell UT, Campbell County0% of 77
- New Hope township, Brown County0% of 30
- Warner township, Brown County0% of 45
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.