To find the flood zone for any U.S. address, enter it below. This checks FEMA’s National Flood Hazard Layer — the current effective flood map, the one your lender and insurer read — and returns the flood zone, whether the property is in a Special Flood Hazard Area, and the base flood elevation where FEMA publishes one. It is free, it takes a few seconds, and your address is not sent to us.
Checked live against FEMA’s National Flood Hazard Layer — the map lenders and insurers use.
Runs in your browser and talks straight to the U.S. Census geocoder and FEMA. Your address is never sent to us.
How to find the base flood elevation for an address
Use the lookup above: it returns the base flood elevation whenever FEMA publishes one for that zone. The base flood elevation, or BFE, is the height floodwater is modelled to reach in a one-percent-annual-chance flood. It is the figure an elevation certificate is measured against, and it decides whether a building stands above or below the expected flood height.
Not every zone has one, which catches people out:
| Zone | Base flood elevation | What that means in practice |
|---|---|---|
| AE | Published | The common high-risk zone in California. An elevation certificate most often changes the answer here. |
| AH | Published as a depth | Shallow ponding, typically 1 to 3 feet. |
| AO | Published as a depth | Shallow sheet flow, typically 1 to 3 feet. |
| A | None determined | High-risk but unstudied. Establishing a BFE usually needs a surveyor or engineer. |
| V and VE | Published, wave action included | Coastal high-risk. The elevation accounts for wave height, not just still water. |
| X, B, C | None | Outside the mapped high-risk area, so no BFE is assigned. |
If a building stands above its BFE, that is worth knowing before buying insurance rather than after. It can support a Letter of Map Amendment, and under Risk Rating 2.0 elevation is among the strongest factors in the premium.
Checking the flood zone for a commercial address
The lookup works identically for commercial property, and the mandatory-purchase rule is the same: a federally backed loan on a building in an A or V zone requires flood insurance regardless of whether it is a house or a warehouse.
What differs is the cover available. NFIP commercial limits stop at $500,000 building and $500,000 contents, which is frequently nowhere near a commercial rebuild cost, and the federal policy does not cover business interruption at all. Both are gaps the private market fills. Commercial flood insurance covers how.
Your flood zone is not permanent
Flood zones change when FEMA revises a map, and a property can move in either direction. Maps are redrawn as new engineering studies finish, as levees gain or lose accreditation, and as development changes how water moves. A property in Zone X today can sit in an AE zone after the next revision — and the reverse happens too, which is how owners end up carrying cover a newer map no longer requires.
- This tool reports the map in effect right now. It is not a forecast and it knows nothing about revisions in progress.
- Preliminary maps exist before they take effect. If FEMA has a study underway where you are, the zone applying at your next renewal may already differ from what you see here.
- One property can be changed on its own. A Letter of Map Amendment or Revision can move a single building out of a high-risk zone, usually where a survey shows it stands above the base flood elevation, without the surrounding map changing.
- Changes move cost both ways. Into a high-risk zone, cover becomes mandatory with a federally backed mortgage. Out of one, it becomes optional — but 29% of NFIP flood claims come from moderate- to low-risk areas, so optional is not the same as unnecessary.
If a lender, an escrow deadline or a map revision is driving the decision, confirm the zone at the point of purchase rather than trusting an earlier lookup. We will do that with you.
What your flood zone tells you, and what it does not
Your flood zone determines whether flood insurance is mandatory. It does not determine your premium.
In an A or V zone with a federally backed mortgage, your lender has to require flood insurance. Outside those zones the decision is yours. Which zones require flood insurance sets out the rule.
On price: since October 2021 the NFIP has priced under Risk Rating 2.0, which rates the individual building — elevation, distance to water, cost to rebuild, foundation type — and does not use the zone as a rating factor at all. Two homes in the same zone can pay very different amounts. What flood insurance actually costs works through the measured figures.
And the map does not tell you whether you will flood. It describes a modelled event. Water does not read it.
Zone by zone: Zone X · Zone A · Zone AE · Zones AH and AO · Zones V and VE
Frequently Asked Questions
How do I find out what flood zone my address is in?
Enter the address in the lookup on this page. It queries FEMA’s National Flood Hazard Layer directly and returns the flood zone, whether the property is in a Special Flood Hazard Area, and the base flood elevation where FEMA publishes one. It is free and requires no account.
Is this the same flood zone my lender will use?
Yes. This reads FEMA’s National Flood Hazard Layer, which is the current effective flood map lenders and insurers rely on. Because maps get revised, confirm the zone at the point of purchase if a loan or escrow deadline depends on it.
What does it mean if my address is in Zone X?
Zone X is outside the Special Flood Hazard Area, so flood insurance is not federally required and no base flood elevation is assigned. It is usually much cheaper — in Zone X we typically place private policies at around $450 a year, all in. It is not risk-free: 29% of NFIP flood claims come from moderate- to low-risk areas.
Can my flood zone change?
Yes. FEMA revises flood maps as new studies are completed, as levees gain or lose accreditation, and as development alters drainage. A single property can also be redesignated on its own through a Letter of Map Amendment, usually where a survey shows the building stands above the base flood elevation.
Why does my address show no flood zone?
Parts of the United States have never been mapped by FEMA. An unmapped location is not the same as a low-risk one — it means the hazard was never studied, and insurers treat unmapped addresses differently from one another.
How do I find the base flood elevation in Zone AE?
The lookup on this page returns it, because FEMA publishes a BFE for Zone AE. Comparing it against your building’s elevation, certified by a surveyor, is what determines whether you sit above or below the expected flood height — and whether a Letter of Map Amendment is worth pursuing.
Does my flood zone set my flood insurance premium?
No. Under Risk Rating 2.0, in effect since October 2021, the NFIP prices each building on its own characteristics — elevation, distance to water, rebuilding cost and foundation type. Your zone determines whether cover is mandatory, not what it costs.