Wisconsin well water / E. coli
E. coli in Wisconsin private well water
If your Wisconsin well water test shows e. coli, compare the number to common health and aesthetic benchmarks, then confirm next steps with a certified lab or local professional.
Plain-English interpretation
E. coli suggests fecal contamination and can cause acute illness.
Do not drink the water. Use bottled water and contact your local health department or well professional.
What Wisconsin homeowners should check
- Confirm the exact unit on the lab report before comparing limits.
- Retest health-related contaminants with a certified lab before major treatment purchases.
- Keep a copy of each report for home sale, rental, and treatment service records.
- Set an annual reminder for bacteria and nitrate testing.
Treatment discussions
- Immediate alternative water
- Well disinfection
- Source correction
Related Wisconsin well water guides
Nitrate
High nitrate can be dangerous for infants and pregnant people.
Arsenic
Long-term arsenic exposure is linked to cancer and other chronic health risks.
Lead
Lead is especially harmful for children and pregnancy, even at low levels.
Total Coliform
Coliform bacteria indicate a possible pathway for contamination into the well.
pH
Low pH can corrode plumbing; high pH can cause scale and taste issues.
Hardness
Hard water causes scale, appliance wear, and soap inefficiency.
Keep your well history
Interpret once on the web. Track forever in the app.
Save test history, set annual reminders, compare results over time, and create a shareable report for your family or water professional.
Track E. coli results in the app