What Does Coliform Present Mean in Well Water?

Coliform present does not always mean fecal contamination, but it does mean the well water failed a bacteria screen and should be treated as unsafe until the source is inspected and a follow-up test is clean.

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Tests à demander

Total coliform
E. coli
Nitrate
Turbidity

Étapes suivantes

Do not use untreated water for drinking, brushing teeth, ice, or infant formula until follow-up testing is clear.
Check whether E. coli was also tested; E. coli present is a stronger sign of fecal contamination.
Inspect the well cap, casing, nearby septic system, drainage, and recent flooding or well work.
Disinfect or repair the well only after the likely contamination pathway is addressed, then retest with a certified lab.

FAQ

Can I shower if coliform is present in well water?

Many households avoid drinking the water but may still use it for bathing unless E. coli is present or a health department gives stricter advice. Avoid swallowing water and use extra caution for infants, wounds, and immune-compromised people.

Does coliform present mean my well needs shock chlorination?

Shock chlorination is common, but it should not replace inspection and source correction. If the well is damaged or surface water is entering, bacteria may return after disinfection.

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Informations éducatives uniquement. Confirmez les décisions importantes avec un laboratoire certifié, une autorité locale, un professionnel de l'eau ou un clinicien.