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.
Test your Idaho well for E. coli
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 E. coli
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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 E. coli
UV disinfection system
whole-house, at the point of entry, about $900
Fix the well cap and casing first; UV keeps bacteria from returning.
For E. coli
Aquasana Rhino Well Water with UV
whole-house, at the point of entry, about $2,871
Whole-house system built for wells: sediment pre-filter, KDF and carbon, and a UV lamp rated to kill 99.99% of bacteria and viruses. It does not remove arsenic, nitrate, uranium or radon.
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 E. coli in Idaho: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit (0 MPN/100mL); counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Butte | 38 | 5% | 0 | 190 MPN/100mL | |
| Teton | 143 | 3% | 0 | 5 MPN/100mL | |
| Blaine | 137 | 3% | 0 | 55 MPN/100mL | |
| Fremont | 313 | 3% | 0 | 200 MPN/100mL | |
| Canyon | 592 | <1% | 0 | 51 MPN/100mL | |
| Elmore | 381 | <1% | 0 | 1 MPN/100mL | |
| Caribou | 100 | 0% | 0 | 0 MPN/100mL | |
| Bingham | 151 | 0% | 0 | 0 MPN/100mL | |
| Bannock | 216 | 0% | 0 | 0 MPN/100mL | |
| Boundary | 78 | 0% | 0 | 0 MPN/100mL | |
| Bonneville | 104 | 0% | 0 | 0 MPN/100mL | |
| Camas | 39 | 0% | 0 | 0 MPN/100mL | |
| Benewah | 116 | 0% | 0 | 0 MPN/100mL | |
| Bonner | 224 | 0% | 0 | 0 MPN/100mL | |
| Boise | 60 | 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
- East Camas CCD, Camas County0% of 30
- Huston CCD, Canyon County0% of 38
- Blanchard-Glengary CCD, Bonner County0% of 85
- Nampa CCD, Canyon County0% of 151
- Notus CCD, Canyon County0% of 41
- Middleton CCD, Canyon County0% of 89
- Sandpoint CCD, Bonner County0% of 55
- Melba CCD, Canyon County0% of 35
- Glenns Ferry CCD, Elmore County0% of 39
- Wilder CCD, Canyon County0% of 75
- Priest River CCD, Bonner County0% of 51
- Burley CCD, Cassia County0% of 38
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.