Sodium in Missouri well water
In Missouri, sodium was detected in 100% of 5,989 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 Missouri 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 Missouri: 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 |
|---|---|---|---|---|---|
| Carroll | no limit | 47 | 100% | 230 | 4,970 mg/L |
| Jefferson | no limit | 120 | 100% | 6.75 | 997 mg/L |
| St. Charles | no limit | 328 | 100% | 12 | 5,420 mg/L |
| Cass | no limit | 40 | 100% | 871 | 10,000 mg/L |
| Scott | no limit | 39 | 100% | 12 | 115 mg/L |
| Stoddard | no limit | 63 | 100% | 14 | 510 mg/L |
| New Madrid | no limit | 95 | 100% | 16 | 620 mg/L |
| Jackson | no limit | 548 | 100% | 44 | 10,600 mg/L |
| Butler | no limit | 31 | 100% | 7.3 | 160 mg/L |
| Saline | no limit | 61 | 100% | 62.5 | 5,100 mg/L |
| Boone | no limit | 1,514 | 100% | 14 | 375 mg/L |
| Chariton | no limit | 43 | 100% | 86 | 4,640 mg/L |
| Cape Girardeau | no limit | 44 | 100% | 10 | 140 mg/L |
| Dunklin | no limit | 60 | 100% | 138 | 260 mg/L |
| St. Louis | no limit | 107 | 100% | 33 | 5,960 mg/L |
- Chouteau township, Clay County100% detected of 105
- Rock Bridge township, Boone County100% detected of 1,273
- Katy township, Boone County100% detected of 206
- Como township, New Madrid County100% detected of 35
- Blue township, Jackson County100% detected of 452
- Piney township, Pulaski County100% detected of 248
- Boone township, St. Charles County100% detected of 240
- Cullen township, Pulaski County100% detected of 83
- Carroll township, Reynolds County100% detected of 56
- Chariton township, Macon County100% detected of 31
- Narrows township, Macon County100% detected of 40
- New Haven township, Franklin County100% detected of 35
- Randolph township, St. Francois County100% detected of 44
- St. Francois township, St. Francois County100% detected of 65
- Joplin township, Jasper County100% detected of 31
- Roubidoux township, Pulaski County97% detected of 156
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.