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What Basement Flooding Is and Isn't Covered by Insurance

Last updated October 25, 2026

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The short answer

Internal Water Damage

If your basement floods because a supply line bursts, a washing machine hose fails, or a water heater leaks, your standard homeowners policy often covers the damage. This includes the cost to dry out, remove damaged drywall and flooring, and repair the source of the leak, minus your deductible.

Coverage hinges on the cause being sudden and accidental, not gradual. If a pipe has been dripping for months and you ignored it, your insurer may deny the claim. Document the damage with photos and keep receipts for any temporary repairs you make.

  • Burst pipes from freezing or wear
  • Leaking appliance supply hoses
  • Overflowing sink or bathtub
  • Water heater tank failure
  • Cracked internal drain line

Flooding from Outside

Water that enters your basement from the ground, such as heavy rain, rising rivers, or a high water table, is typically not covered by a standard homeowners policy. This is considered a flood and requires a separate flood insurance policy, often through the National Flood Insurance Program or a private insurer.

In a mild marine climate with wet winters and dry summers, your area can see heavy rain events. If you live in Kirkland, it is worth checking whether your property sits in a flood zone, even if you have never flooded before.

Policies vary, and your insurer decides what is covered.

  • Rainwater seeping through foundation cracks
  • Groundwater rising into a sump pit
  • Overland flooding from a creek or lake
  • Storm surge (if you live near a large body of water)

Sewer Backup Coverage

A sewer backup is a separate risk that many standard policies exclude. You can often add an endorsement or rider for a small extra premium, but it is not automatic. If a sewer line backs up into your basement, the cleanup involves hazardous waste, which requires special handling.

Check your policy declarations page for the words "sewer backup" or "water backup." If it is not listed, ask your insurance agent about adding it. In the meantime, avoid using water in your home if you suspect a backup, and keep a plumber's number handy.

What Your Deductible Applies To

Regardless of what is covered, you will pay your deductible before your insurance kicks in. For flood insurance, deductibles can be separate and sometimes higher than your homeowners deductible. Know these numbers before a flood happens so you are not caught off guard.

Your policy may also limit coverage for certain items, like electronics or documents stored in the basement. Valuable items like jewelry or collectibles often require additional riders. Take an inventory of your basement contents and store the list outside your home.

Steps to Take After a Flood

Act quickly to prevent further damage and mold growth. Turn off the electricity if it is safe, and shut off the water supply to your home if the leak is internal. Do not enter standing water if there is any chance of electrical shock.

Document everything with photos and notes before you move or throw away any items. Call your insurance company to report the claim, and ask about emergency cleanup services. You can also contact local water damage pros for a thorough drying process, but check with your insurer first about any recommended providers.

For immediate help with removing water and drying your basement, see the flooded-basement-cleanup and structural-drying-dehumidification pages.

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Call (425) 406-3256 any time, day or night, and describe what happened.

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Frequently asked questions

Does my homeowners insurance cover basement flooding from rain?

Usually not. Rainwater that seeps through the ground or enters from outside is considered flooding, which is excluded from standard homeowners policies. You would need separate flood insurance for that type of water entry.

What if a pipe bursts in my basement, is that covered?

Yes, a sudden burst pipe is typically covered under a standard homeowners policy, including the cost to dry out and repair the damage. Check your policy for any exclusions, and document the damage with photos before cleaning up.

How can I add sewer backup coverage to my policy?

Ask your insurance agent about adding a sewer backup endorsement to your homeowners policy. This is usually an optional rider that costs extra but can cover cleanup and damage from a sewer line backup. Check your current policy to see if it is already included.

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