The short answer
Why Flood Water Contaminates Your Supply
Floodwater is rarely clean. It can pick up sewage, animal waste, agricultural runoff, fuel, and industrial chemicals as it moves through streets and yards. When water levels rise, that mixture can seep into wells or enter municipal pipes through cracks or backflow, especially if pressure drops.
Even if your tap water looks clear, it may still contain harmful microbes or chemicals. Some contaminants have no taste or odor. That is why visual checks are not enough. Local health authorities test the water and decide when it is safe, so their guidance is the one to follow.
What to Do Until You Get the All-Clear
Use bottled water for drinking, brushing teeth, making ice, and preparing food. If you have infants or anyone with a weakened immune system, take extra care with water used for formula or cleaning wounds. For hygiene, you can use tap water for flushing toilets, but avoid swallowing it.
If you rely on a private well, assume it is contaminated after a flood. Do not use the water for drinking or cooking until the well has been inspected and tested. A local water damage pro can help assess damage to your home, but water testing is a separate step. Policies vary, and your insurer decides what is covered.
- Boiling kills bacteria but does not remove chemicals or heavy metals.
- Household filters usually do not remove all flood contaminants.
- Do not use water from a flooded water heater for drinking.
- If water pressure drops, your plumbing may have backflow issues.
- Discard any food that came into contact with floodwater.
- Wash hands with bottled water if tap water is unsafe.
How to Check Your Well After a Flood
If you have a private well, do not drink the water until it is tested. Floodwater can contaminate the well even if the pump works. Have a professional inspect the wellhead for cracks, and check that the cap is secure. After the flood recedes, you may need to flush the system.
A water test can show whether bacteria or chemicals are present. Your local health department can tell you what to test for and where to send samples. Until results come back clean, keep using bottled water for any internal use.
When Is It Safe to Drink Tap Water Again
You should only resume tap water use when local officials or your water utility announce it is safe. For private wells, that means after a test shows no contamination. Even then, it is wise to run taps for several minutes to flush out any remaining water in your pipes.
If you live in Redmond, you can check with the city or your local health district for updates during a flood event. They will issue boil water advisories or do-not-drink notices as needed. Follow those instructions exactly, and keep bottled water on hand until the advisory is lifted.
What If Floodwater Entered Your Home
Floodwater that enters your home can soak drywall, flooring, and personal items. That water is contaminated and can leave behind harmful organisms as it dries. You need to remove wet materials and dry the area thoroughly to prevent mold growth. This is a big job that often requires professional help.
Local water damage pros can extract standing water, remove soaked materials, and dry out your home. They can also help identify hidden moisture in walls and crawlspaces. For a full cleanup, consider services like flooded basement cleanup or flood damage cleanup to get your home back to a safe state. Policies vary, and your insurer decides what is covered.
- Wear rubber boots and gloves during cleanup.
- Open windows and use fans to speed up drying.
- Remove any wet carpet, padding, and drywall promptly.
- Disinfect hard surfaces with a bleach solution after drying.
- Do not turn on electrical equipment that got wet.
- Take photos of damage for your insurance records.
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Call Now (425) 407-5186Frequently asked questions
Can I boil flood water to make it safe?
Boiling kills most bacteria and viruses, but it does not remove chemicals, heavy metals, or fuel. If officials issue a boil water advisory, boiling is fine. Otherwise, use bottled water. When in doubt, follow local guidance.
How long does a boil water advisory last?
It depends on the cause and extent of contamination. Municipalities usually lift advisories after water tests come back clean. For private wells, it lasts until you get a passing test. This can take days or longer, so plan to use bottled water.
What should I do with food that touched floodwater?
Throw it away. Any food, including canned goods, that came into contact with floodwater should be discarded. The water can seep into packaging and introduce bacteria. When in doubt, toss it out to avoid illness.