If your water well has flooded or surface floodwater enters the well head and goes down into the casing, your water might be contaminated with bacteria or chemicals. Wells in pits or basements can also flood or be contaminated. When flooding happens, your well needs to be checked. Even if your well looks fine, bacteria and chemicals can still get in.
If your well has flooded,
don’t use the water:
Flood waters can carry waste (e.g., wood, rocks, metal objects) that can damage the well casing, electrical parts, and the pump. When the flood waters have gone down (receded), call a licensed water-well contractor to check your well system. The pump (including valves and gears) might need to be cleaned to remove any soil or sand.
Don’t turn on the pump until the wiring system has been checked by a qualified electrician or a licensed water-well contractor because there is a risk of being electrocuted and damaging the well and pump.
If flooded, your well and the whole plumbing system connected to it needs to be shock chlorinated. For more information about shock chlorination, call an
Environmental Public Health office in your area.
Before you use your well again, have the water tested for bacteria. You can get bottles and instructions for testing from an AHS Environmental Public Health office. Your Public Health Inspector (PHI) or Environmental Health Officer (EHO) will tell you if your water is safe to use. If you think your well has been contaminated with chemicals, talk to your PHI or EHO to arrange testing.
When the flood is over and the well is back to normal, check with a licensed water-well contractor or
Environmental Health for more information to protect your well from future floods. This may include:
If you have any questions, call
Environmental Public Health.
Current as of: March 7, 2018
Author: Environmental Public Health, Alberta Health Services
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