How do I find out if my house is in a flood zone in Sebastian FL?

Type your address into FEMA's Flood Map Service Center at msc.fema.gov, use the Indian River County flood map viewer linked on the City of Sebastian's Flood Maps page, or call the city's Community Development Department at 772-589-5518.

Will the City of Sebastian tell me my flood zone?

Yes. The Community Development Department will tell you the flood zone, map panel number and map date for any property inside Sebastian city limits.

What is the 50% rule in Sebastian?

If repairs or improvements cost 50 percent or more of the building's market value and the lowest floor is below the 100-year flood elevation, the home must be brought up to the city's flood rules, which can mean elevating it.

Does homeowners insurance cover flooding in Florida?

FEMA says most standard homeowners policies do not cover flood damage. Flood coverage is a separate policy, and it typically takes 30 days to become active.

Can I get an elevation certificate from the City of Sebastian?

The city says copies of elevation certificates may be available on request. Call Community Development at 772-589-5518 to ask about your address.

Storms & safety

Is my Sebastian home in a flood zone? How to look it up on the FEMA map, and who to call

Your flood zone affects how you can build, remodel and protect your house. In Sebastian, you can look it up yourself in a few minutes, or ask the city to do it for you.

October 18, 2026 · 3 min read · Sebastian

Ask most Sebastian homeowners what flood zone they are in and you will get a shrug. That is normal. Most of us only hear about it at closing, then forget.

But your flood zone matters long after you buy. It can change how you remodel, how high a new addition has to sit, and how you think about protecting the house. The good news: in Sebastian, finding out is free and takes a few minutes.

What a flood zone actually means

FEMA draws flood maps called Flood Insurance Rate Maps, or FIRMs. They split land into zones based on flood risk. The City of Sebastian explains the two terms you will see most.

Floodplain: an area flooded during a 100-year flood, or any area marked as an A or V zone on the FIRM.
Floodway: the normal channel of a creek or waterway plus the land next to it that has to stay open to carry floodwater. The city allows only low-damage uses there that do not block the flow.
Base flood elevation: the height floodwater is expected to reach in that 100-year flood. The city says homes in the floodplain are allowed if the lowest floor is at least one foot above it.

If your lot is outside the A and V zones, it is not in the mapped floodplain. That does not mean it never gets wet. Heavy rain and blocked swales can still put water in the yard and the street.

How to look up your Sebastian address

The City of Sebastian's Flood Maps page links to three free tools. Any of them works from a phone or a computer.

FEMA Flood Map Service Center (msc.fema.gov). Type in your street address and FEMA shows the official flood map for your spot.
Indian River County's flood map viewer. The city says it includes Sebastian and shows the Special Flood Hazard Areas, the high-risk zones.
The city's interactive maps. These show projects and information about your neighborhood.
Prefer a person? Call the Community Development Department at 772-589-5518, or stop by City Hall at 1225 Main Street. City Hall is open Monday through Friday, 8 a.m. to 4:30 p.m., and closed for lunch from noon to 1 p.m.

While you are on the phone, ask whether the city has an elevation certificate on file for your home. The city's flood page says copies may be available on request. An elevation certificate shows how high your lowest floor sits compared with the base flood elevation.

Planning a big remodel? Know the 50% rule

This is the part that surprises people. If your home's lowest floor is below the 100-year flood elevation, the city's flood rules may affect how you rebuild, renovate or add on.

The City of Sebastian's notice to owners explains it this way. If the cost of an improvement, or of repairing damage, equals or exceeds 50 percent of the market value of the building, the home has to be brought up to the city's flood rules. That can include raising the building to or above the 100-year flood elevation.

Market value: the city estimates it from your tax assessed value of the structure, not the land, plus about 15% to 20%. If you disagree, you can hire a state-licensed appraiser and submit an appraisal.
Cost estimate: you submit a detailed estimate signed by a licensed general contractor, with an affidavit that it covers all the work.
What does not count: items that are not a permanent part of the house, such as plans, surveys, sidewalks, pools, screens, sheds, gazebos and fences.
Elevation certificate: if the 50% line is crossed, the city needs one to find your lowest floor height.

What to do this week

Look up your zone on the FEMA map or call 772-589-5518. Write down the zone, the map panel number and the map date.
Ask the city whether an elevation certificate is on file for your address, and keep a copy with your house papers.
Planning an addition or big remodel? Ask the Building Department about the 50% rule before you sign a contract, not after.
Check your insurance papers. FEMA says most standard homeowners policies do not cover flood damage, and a flood policy typically takes 30 days to become active. Talk to a licensed agent with questions.
Keep your swale and culvert clear, and report ditch or drainage problems to Sebastian Public Works at 772-228-7001.

Common questions

How do I find out if my house is in a flood zone in Sebastian FL?: Type your address into FEMA's Flood Map Service Center at msc.fema.gov, use the Indian River County flood map viewer linked on the City of Sebastian's Flood Maps page, or call the city's Community Development Department at 772-589-5518.
Will the City of Sebastian tell me my flood zone?: Yes. The Community Development Department will tell you the flood zone, map panel number and map date for any property inside Sebastian city limits.
What is the 50% rule in Sebastian?: If repairs or improvements cost 50 percent or more of the building's market value and the lowest floor is below the 100-year flood elevation, the home must be brought up to the city's flood rules, which can mean elevating it.
Does homeowners insurance cover flooding in Florida?: FEMA says most standard homeowners policies do not cover flood damage. Flood coverage is a separate policy, and it typically takes 30 days to become active.
Can I get an elevation certificate from the City of Sebastian?: The city says copies of elevation certificates may be available on request. Call Community Development at 772-589-5518 to ask about your address.