Sodium in Massachusetts well water
In Massachusetts, sodium was detected in 100% of 8,098 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 Massachusetts 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 Massachusetts: 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 |
|---|---|---|---|---|---|
| Worcester | no limit | 321 | 100% | 15 | 200 mg/L |
| Berkshire | no limit | 105 | 100% | 3 | 290 mg/L |
| Bristol | no limit | 33 | 100% | 17.9 | 133 mg/L |
| Essex | no limit | 330 | 100% | 27 | 300 mg/L |
| Franklin | no limit | 53 | 100% | 5 | 410 mg/L |
| Hampden | no limit | 88 | 100% | 10.9 | 309 mg/L |
| Barnstable | no limit | 2,787 | 100% | 12 | 3,600 mg/L |
| Norfolk | no limit | 185 | 100% | 25 | 1,530 mg/L |
| Plymouth | no limit | 3,550 | 100% | 7.5 | 377 mg/L |
| Middlesex | no limit | 581 | 100% | 31 | 3,640 mg/L |
- Andover, Essex County100% detected of 103
- Sandwich, Barnstable County100% detected of 196
- Barnstable Town, Barnstable County100% detected of 317
- Chatham, Barnstable County100% detected of 76
- Harwich, Barnstable County100% detected of 136
- Truro, Barnstable County100% detected of 106
- Yarmouth, Barnstable County100% detected of 276
- Brewster, Barnstable County100% detected of 46
- Eastham, Barnstable County100% detected of 32
- Dennis, Barnstable County100% detected of 250
- Mashpee, Barnstable County100% detected of 62
- Falmouth, Barnstable County100% detected of 675
- Bourne, Barnstable County100% detected of 166
- Chelmsford, Middlesex County100% detected of 240
- Orleans, Barnstable County100% detected of 432
- Wayland, Middlesex County100% detected of 115
- Canton, Norfolk County100% detected of 115
- Plymouth, Plymouth County100% detected of 1,774
- Wareham, Plymouth County100% detected of 1,653
- Charlton, Worcester County100% detected of 41
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.