E. coli in Idaho well water
In Idaho, <1% of 5,473 tested private well samples exceeded the EPA limit for E. coli (0 MPN/100mL).
E. coli in a well means fecal contamination from septic systems, animals or surface water entering the well. It can cause serious gastrointestinal illness. Any detection is a failure.
Check your E. coli 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 E. coli.
By county, from individual samples
Public monitoring samples against the EPA limit (0 MPN/100mL); counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Butte | 38 | 5% | 5% | 0 | 190 MPN/100mL |
| Teton | 143 | 3% | 3% | 0 | 5 MPN/100mL |
| Blaine | 137 | 3% | 3% | 0 | 55 MPN/100mL |
| Fremont | 313 | 3% | 3% | 0 | 200 MPN/100mL |
| Canyon | 592 | <1% | <1% | 0 | 51 MPN/100mL |
| Elmore | 381 | <1% | <1% | 0 | 1 MPN/100mL |
| Caribou | 100 | 0% | 0% | 0 | 0 MPN/100mL |
| Bingham | 151 | 0% | 0% | 0 | 0 MPN/100mL |
| Bannock | 216 | 0% | 0% | 0 | 0 MPN/100mL |
| Boundary | 78 | 0% | 0% | 0 | 0 MPN/100mL |
| Bonneville | 104 | 0% | 0% | 0 | 0 MPN/100mL |
| Camas | 39 | 0% | 0% | 0 | 0 MPN/100mL |
| Benewah | 116 | 0% | 0% | 0 | 0 MPN/100mL |
| Bonner | 224 | 0% | 0% | 0 | 0 MPN/100mL |
| Boise | 60 | 0% | 0% | 0 | 0 MPN/100mL |
- Tetonia CCD, Teton County9% of 56
- Hailey-Bellevue CCD, Blaine County5% of 56
- St. Anthony CCD, Fremont County5% of 79
- Parma CCD, Canyon County3% of 92
- Caldwell CCD, Canyon County3% of 71
- Ashton CCD, Fremont County2% of 171
- Ketchum CCD, Blaine County2% of 57
- Mountain Home CCD, Elmore County<1% of 334
- Kimberly CCD, Twin Falls County0% of 49
- Filer CCD, Twin Falls County0% of 54
- Glenns Ferry CCD, Elmore County0% of 39
- Hollister CCD, Twin Falls County0% of 57
- McCall CCD, Valley County0% of 44
- Twin Falls CCD, Twin Falls County0% of 42
- Buhl CCD, Twin Falls County0% of 58
- South Bannock CCD, Bannock County0% of 110
- Nez Perce CCD, Nez Perce County0% of 48
- Island Park CCD, Fremont County0% of 63
- Lewiston CCD, Nez Perce County0% of 34
- Council CCD, Adams County0% of 33
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. E. coli counts and shares are listed on each county and town page with their sources.