Sodium in Idaho well water
In Idaho, sodium was detected in 100% of 8,467 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.
Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes sodium.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Adams | 74 | 100% | no limit | 9.74 | 27.8 mg/L |
| Bannock | 344 | 100% | no limit | 30 | 190 mg/L |
| Bear Lake | 114 | 100% | no limit | 31.3 | 560 mg/L |
| Benewah | 185 | 100% | no limit | 7.67 | 120 mg/L |
| Bingham | 250 | 100% | no limit | 16 | 120 mg/L |
| Blaine | 142 | 100% | no limit | 5.2 | 47 mg/L |
| Boise | 100 | 100% | no limit | 17.9 | 142 mg/L |
| Bonner | 364 | 100% | no limit | 4.11 | 150 mg/L |
| Bonneville | 185 | 100% | no limit | 14 | 200 mg/L |
| Boundary | 118 | 100% | no limit | 8.99 | 80.6 mg/L |
| Butte | 90 | 100% | no limit | 12 | 75 mg/L |
| Camas | 59 | 100% | no limit | 12 | 51.1 mg/L |
| Canyon | 801 | 100% | no limit | 51 | 206 mg/L |
| Caribou | 184 | 100% | no limit | 20 | 120 mg/L |
| Ada | 626 | 100% | no limit | 32.1 | 230 mg/L |
- Bruneau CCD, Owyhee County100% detected of 36
- Murphy CCD, Owyhee County100% detected of 39
- Grand View CCD, Owyhee County100% detected of 62
- Grangeville CCD, Idaho County100% detected of 79
- Nez Perce CCD, Idaho County100% detected of 35
- Cascade CCD, Valley County100% detected of 59
- McCall CCD, Valley County100% detected of 76
- Fort Hall CCD, Bannock County100% detected of 37
- Inkom CCD, Bannock County100% detected of 33
- Pocatello CCD, Bannock County100% detected of 103
- South Bannock CCD, Bannock County100% detected of 171
- Glenns Ferry CCD, Elmore County100% detected of 63
- Mountain Home CCD, Elmore County100% detected of 208
- Mink Creek CCD, Franklin County100% detected of 33
- Ashton CCD, Fremont County100% detected of 86
- Island Park CCD, Fremont County100% detected of 96
- St. Anthony CCD, Fremont County100% detected of 55
- Buhl CCD, Twin Falls County100% detected of 117
- Filer CCD, Twin Falls County100% detected of 90
- Hollister CCD, Twin Falls County100% detected of 137
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.