Sodium in Washington well water
In Washington, sodium was detected in 100% of 10,587 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 Washington 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 Washington: 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 |
|---|---|---|---|---|---|
| Franklin | no limit | 380 | 100% | 43 | 250 mg/L |
| Lincoln | no limit | 209 | 100% | 20 | 130 mg/L |
| Klickitat | no limit | 90 | 100% | 12.5 | 92 mg/L |
| Yakima | no limit | 1,195 | 100% | 38.2 | 203 mg/L |
| Pierce | no limit | 563 | 100% | 6.9 | 572 mg/L |
| Benton | no limit | 407 | 100% | 26 | 700 mg/L |
| Douglas | no limit | 58 | 100% | 15.5 | 64 mg/L |
| Skagit | no limit | 67 | 100% | 15 | 550 mg/L |
| San Juan | no limit | 81 | 100% | 71 | 870 mg/L |
| Grays Harbor | no limit | 57 | 100% | 8.3 | 120 mg/L |
| Mason | no limit | 58 | 100% | 3.8 | 60 mg/L |
| Pacific | no limit | 90 | 100% | 11.5 | 3,400 mg/L |
| Island | no limit | 111 | 100% | 29.1 | 5,800 mg/L |
| Kittitas | no limit | 97 | 100% | 14 | 150 mg/L |
| Lewis | no limit | 193 | 100% | 6 | 10,500 mg/L |
- Long Beach-North Beach Peninsula CCD, Pacific County100% detected of 64
- North Whidbey Island CCD, Island County100% detected of 63
- Puyallup CCD, Pierce County100% detected of 53
- Thurston South CCD, Thurston County100% detected of 62
- Fort Lewis-DuPont CCD, Pierce County100% detected of 283
- Graham-Thrift CCD, Pierce County100% detected of 34
- Tacoma CCD, Pierce County100% detected of 155
- Richland-Kennewick CCD, Benton County100% detected of 85
- South Benton CCD, Benton County100% detected of 30
- Hanford Site CCD, Benton County100% detected of 253
- Northwest Benton CCD, Benton County100% detected of 32
- San Juan Island CCD, San Juan County100% detected of 32
- Enumclaw Plateau CCD, King County100% detected of 87
- Seattle East CCD, King County100% detected of 109
- Olympia East CCD, Thurston County100% detected of 106
- Snoqualmie Valley CCD, King County100% detected of 98
- Federal Way-Auburn CCD, King County100% detected of 53
- Seattle CCD, King County100% detected of 83
- Issaquah Plateau CCD, King County100% detected of 30
- Kittitas CCD, Kittitas County100% detected of 34
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.