Sodium in South Dakota well water
In South Dakota, sodium was detected in 100% of 14,931 tested private well samples.
Sodium enters wells with road salt and from softeners. EPA's guidance level of 20 mg/L matters for people on sodium-restricted diets; most people are not affected below 250 mg/L.
Check your sodium 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 sodium
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 sodium
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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 sodium
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
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 sodium in South Dakota: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Aurora | no limit | 89 | 100% | 390 | 860 mg/L |
| Custer | no limit | 280 | 100% | 14 | 5,570 mg/L |
| Beadle | no limit | 1,623 | 100% | 298 | 1,480 mg/L |
| Brookings | no limit | 636 | 100% | 17 | 1,260 mg/L |
| Bennett | no limit | 168 | 100% | 17 | 130 mg/L |
| Brule | no limit | 31 | 100% | 94 | 953 mg/L |
| Buffalo | no limit | 35 | 100% | 132 | 680 mg/L |
| Bon Homme | no limit | 227 | 100% | 130 | 750 mg/L |
| Campbell | no limit | 249 | 100% | 151 | 2,200 mg/L |
| Charles Mix | no limit | 334 | 100% | 315 | 1,400 mg/L |
| Clark | no limit | 439 | 100% | 122 | 1,350 mg/L |
| Brown | no limit | 417 | 100% | 400 | 2,000 mg/L |
| Codington | no limit | 226 | 100% | 45 | 600 mg/L |
| Corson | no limit | 127 | 100% | 390 | 34,800 mg/L |
| Davison | no limit | 108 | 100% | 258 | 745 mg/L |
- Howard township, Charles Mix County100% detected of 55
- Bryan township, Charles Mix County100% detected of 52
- Central Pennington UT, Pennington County100% detected of 100
- Rapid City, Pennington County100% detected of 134
- Mount Rushmore UT, Pennington County100% detected of 61
- Rapid City East UT, Pennington County100% detected of 34
- West Pennington UT, Pennington County100% detected of 36
- West McPherson UT, McPherson County100% detected of 34
- Belle Fourche-Cheyenne Valleys UT, Meade County100% detected of 131
- Southwest Meade UT, Meade County100% detected of 106
- North Meade UT, Meade County100% detected of 84
- Jefferson township, Union County100% detected of 93
- Civil Bend township, Union County100% detected of 56
- Elk Point township, Union County100% detected of 112
- Richland UT, Union County100% detected of 39
- Central Mellette UT, Mellette County100% detected of 43
- North Dewey UT, Dewey County100% detected of 54
- Central Hyde UT, Hyde County100% detected of 31
- East Haakon UT, Haakon County100% detected of 31
- Kennedy township, Charles Mix County100% detected of 37
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. sodium counts and shares are listed on each county and town page with their sources.