Well Water Interpreter
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Private well answer guide

Well Water Test After Heavy Rain: What to Check

After heavy rain, especially if water becomes cloudy or the well is shallow, test bacteria, nitrate, turbidity, and local runoff-related contaminants before assuming the water is safe.

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Tests to run

  • Total coliform
  • E. coli
  • Nitrate
  • Turbidity

Next steps

  • Use caution if the well was submerged, the cap is damaged, or water became cloudy.
  • Test total coliform, E. coli, nitrate, and turbidity after conditions stabilize.
  • Inspect drainage so surface water flows away from the well casing.
  • Retest if bacteria appears or if the same problem repeats after storms.

FAQ

Can rain cause coliform in well water?

Yes, heavy rain can reveal a surface-water pathway into a vulnerable well or plumbing system.

Should I shock chlorinate after every heavy rain?

No. Repeated bacteria after rain usually means the source pathway needs correction, not repeated disinfection alone.

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Educational guidance only. Always confirm important decisions with a certified laboratory, local health department, qualified water treatment professional, or clinician.