How to find out if your house is in a flood zone
Homeowners insurance does not cover flooding. How to look up your real risk, what the map zones mean, and what to do if you are inside one.
Most people find out they live in a flood zone the day their house floods. The information is public, free and searchable by address, but almost nobody looks until it is too late to matter.
Where to look it up
In the United States, FEMA maintains the flood maps that insurers use, and they can be searched by address.
Check with your municipality too: national maps have limited resolution, and the local public works department usually knows the specific corners where water pools from insufficient drainage even when they are not mapped as a risk zone.
What the zones actually mean
| Term | What it really means |
|---|---|
| 100-year zone | A 1 percent chance in any given year |
| 500-year zone | A 0.2 percent chance in any given year |
| Outside the zone | Lower probability, not absence of risk |
Insurance is where most people find out too late
A standard homeowners policy covers water damage from a burst pipe inside the house, but not water coming in from outside. That is separate coverage, bought separately.
And it has a critical detail: it normally takes effect weeks after purchase. Buying it with a storm already in the forecast does not protect you from that storm.
What to do if you are inside a zone
- Elevate what is vulnerable. Furnace, electrical panel, washer and HVAC equipment, above the expected level.
- Install backflow valves on drains so an overloaded sewer does not come back into the house.
- Keep gutters and storm drains clear. A good share of water intrusions start with a blocked drain.
- Seal cracks in foundations and basement walls.
- Have a plan keyed to water depth: what gets moved up, what gets shut off, and when you leave.
- Why you should never drive through a flooded road Six inches of moving water knocks an adult down and two feet float most vehicles. Why flood water always looks shallower than it is.
- What to do when water gets into your house Electricity, gas, water depth and contamination. The order of decisions once the flood is already inside, and what not to touch when you return.
Gear that covers this
Products that match what the guide above recommends.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases. This does not change the price you pay or the recommendations we make.
- View on Amazon
Water sensor with alarm
Warns when water enters a basement or utility room before it reaches equipment. Some send an alert to your phone.
- View on Amazon
Waterproof document bags
Deeds, policies and IDs. It is what survives water worst and costs most to replace.
Frequently asked questions
Does homeowners insurance cover flooding?
Generally no. Flood coverage is bought separately and typically has a waiting period of weeks before it takes effect, so buying it once a storm is in the forecast does not protect you from that storm.
Am I safe if I am not in a high-risk zone?
No. A substantial share of flood claims come from properties outside high-risk areas shown on the maps. Zones describe probability, not impossibility.
What does a 100-year flood zone mean?
That the area has roughly a 1 percent chance of flooding in any given year. It does not mean once a century: it can happen two years in a row.
What can I do if my house is in a flood zone?
Elevate vulnerable equipment, install backflow valves, keep drains clear, buy specific coverage and have an evacuation plan keyed to water depth.