On this page
The question comes up every time a big storm hits: the house has water in it, the homeowners policy is paid up, so the flood damage is covered, right? Usually not. Standard homeowners insurance excludes flood damage, and that exclusion surprises more people than almost any other gap in American insurance. Here is what the standard policy leaves out, what a flood policy covers, and how to close the gap.
Why standard homeowners policies exclude floods
A standard homeowners policy covers water damage from some sources, like a burst pipe or water backing up from a failed appliance, but it specifically excludes flooding from rising water. Rising water means water that comes from outside the house and rises up into it: overflowing rivers, storm surge, heavy rain that overwhelms drainage, flash floods. The reason is actuarial rather than personal. Floods hit entire regions at once, which makes the losses catastrophic and concentrated, and private insurers historically would not price that risk into standard policies.
This is also why the standard policy’s water coverage gets confusing. A pipe that bursts inside your wall is generally covered. Rain that pours through a wind-damaged roof is generally covered, because the wind was the covered cause. But water that rises from the ground, no matter what storm caused it, is excluded unless you have separate flood coverage. When in doubt about a water claim, the question the adjuster asks is where the water came from.
What a flood insurance policy covers
Flood insurance is sold separately, most commonly through the National Flood Insurance Program (NFIP), with some private flood insurers also in the market. A standard flood policy has two parts:
- Building coverage. The physical structure: foundation, walls, floors, built-in appliances, electrical and plumbing systems, and attached fixtures. This is what pays to repair the house itself.
- Contents coverage. Your belongings inside: furniture, clothes, electronics, portable appliances. Contents coverage is often sold separately from building coverage, so a policy can cover the structure but not what is inside it if you only bought the first part.
There are meaningful limits on what flood insurance pays for. Basements get restricted coverage: structural elements and essential equipment like furnaces and water heaters are covered, but finished basement walls, floors, and most personal property stored in a basement are covered only partially or not at all. Items outside the building, like decks, fences, landscaping, and pools, are generally excluded. Cars are excluded too, which is what your auto insurance is for, and only if you carry comprehensive coverage.
One more thing to know before you buy: most NFIP policies come with a 30-day waiting period before coverage takes effect, so you cannot buy a policy the week a hurricane is forecast and expect it to pay. Private flood insurers sometimes offer shorter waits, but the principle holds either way. Flood insurance is a purchase you make in calm weather.
Who actually needs flood insurance
The short answer is more people than buy it. Lenders require flood insurance if your home sits in a high-risk flood zone and you carry a mortgage, but plenty of flood damage happens outside the mapped high-risk areas. A meaningful share of flood claims come from properties in moderate or low-risk zones, where owners are not required to carry coverage and often do not.
A few situations where it deserves serious consideration:
- Your property is in or near a mapped flood zone, even a moderate one.
- Your area has seen flash flooding or overwhelmed storm drains in recent years.
- Your home has a basement or sits at the low end of the street grade.
- You live near a coast, river, or reservoir, or downstream of a dam.
You can look up your property’s flood zone on FEMA’s flood maps, which are public. The maps are not perfect and they lag development, so treat a low-risk designation as information, not a guarantee.
What flood insurance costs
Premiums vary with the flood zone, the elevation of the home, the coverage limits you choose, and the deductible. Homes in high-risk zones pay the most, sometimes several thousand a year, while preferred-risk policies outside high-risk zones cost far less. The NFIP prices by its own rating system, and private insurers price by theirs, so it is worth quoting both. The price feels high until you compare it with the cost of rebuilding a flooded first floor out of pocket, which is the alternative.
How flood coverage fits your overall protection
Flood insurance is one piece of a complete home protection picture. Your standard homeowners policy handles fire, wind, theft, and the sudden water events that start inside the house, as explained in our guide to what homeowners insurance covers. Earthquake coverage is another common exclusion that needs its own endorsement. The mistake to avoid is assuming the standard policy is a catch-all. It is a defined list of perils with defined exclusions, and water from the ground up is the biggest exclusion most homeowners never notice until they need it.
