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Buying land in Martin County, Florida: what to check

Martin County covers 544 square miles of land and 209 of water in Florida, with about 165,666 residents in 2024 (up 4.6% since 2020). The 2020 Census counted 85% of its land as rural and 93% of residents as living in urban areas. Farms operate 52% of the county's land. Below: how much of Martin County floods, what its soils allow, what farmland is worth and how often it's in drought, from free public data with every source linked.

Check a location in Martin CountySee a sample report

Martin County at a glance

In the 100-year floodplain

6.5%

Below the state's county median (7.5%)

FEMA National Risk Index

Hydric (wetland-type) soils

46%

Above the state's county median (38%)

USDA NRCS Web Soil Survey (SSURGO)

Soils very limited for septic

99%

USDA NRCS Web Soil Survey (SSURGO)

Farm land value, 2022

$7,304/acre

Above the state's county median ($6,645)

USDA NASS, 2022 Census of Agriculture

Weeks in severe drought

12%

Share of weekly maps, 2021–2026

U.S. Drought Monitor county statistics

Land classed rural

85%

Census 2020 Census urban and rural classification

What to check before buying land in Martin County

Ordered by what Martin County's numbers point to. Every parcel differs, so treat this as where to look first.

  1. 1.Expect wetlands; map them before you plan

    About 46% of Martin County's mapped soils are hydric (formed under saturated conditions, a federal wetland indicator) and 90% are poorly or very poorly drained (USDA SSURGO).

    Open the National Wetlands Inventory mapper at the parcel. Filling or draining a wetland can need a Clean Water Act Section 404 permit, and wet ground limits septic fields and building pads.

    Guide: Wetlands on land for sale

  2. 2.Budget for a perc test and maybe an engineered septic

    USDA rates 99% of Martin County's mapped soils "very limited" for conventional septic absorption fields and 0% "not limited".

    Without city sewer you need a septic permit from the county or state health department. Make the offer contingent on a passing soil or perc test; mound and aerobic systems can cost several times a conventional one.

    Guide: Perc tests and septic systems

  3. 3.Confirm the flood zone at your exact spot

    6.5% of the county's area is in the 1%-annual-chance (100-year) floodplain FEMA's National Risk Index uses for inland flooding; 1.1% is exposed to coastal flooding; 1.1% of its mapped soils flood occasionally or frequently.

    Even where little of the county floods, creeks and low spots do. Check the FEMA zone at the building site and the driveway route.

    Guide: Flood zones before buying land

  4. 4.Check wildfire exposure and insurance

    FEMA rates Martin County's wildfire risk relatively moderate, and 22% of the county's area is in the wildfire exposure zone the National Risk Index uses.

    Ask an insurer for a quote early; some carriers won't write new policies in high-hazard areas. Check access for fire trucks, nearby fire stations and the vegetation around the building site.

    Guide: Wildfire risk for rural land

  5. 5.Confirm legal road access and power

    The 2020 Census classified 85% of Martin County's land area as rural.

    Rural tracts are often sold without recorded access or a power line nearby. Get the title company to confirm a recorded easement or public road frontage, and ask the electric co-op what a line extension costs.

    Guide: Road access and landlocked land

  6. 6.Find out where the water comes from

    At least half of Martin County was in severe drought (D2) or worse in 12% of the 262 weekly U.S. Drought Monitor maps from 2021 to 2026.

    Ask whether the land has a public water connection, an existing well (and its log and yield), or neighbors' well depths from the state well database. For a new well, check permits and typical depth with the state agency first.

    Guide: Wells, public water and water rights

Flood zones, wetlands and water in Martin County

Area in the 1%-annual-chance (100-year) floodplain
6.5%, 30th lowest of 67 in Florida FEMA National Risk Index
Area exposed to coastal flooding
1.1% FEMA National Risk Index
Mapped soils that flood occasionally or frequently
1.1% USDA NRCS Web Soil Survey (SSURGO)
Hydric soils (a federal wetland indicator)
46% USDA NRCS Web Soil Survey (SSURGO)
Poorly or very poorly drained soils
90% USDA NRCS Web Soil Survey (SSURGO)
Surface water (lakes, rivers, reservoirs)
209 sq mi Census 2024 Gazetteer Files
Drought on 2026-10-27
24% moderate or worse, 0% severe or worse U.S. Drought Monitor county statistics

The floodplain share is the area FEMA's National Risk Index counts as exposed to inland flooding, mostly mapped 100-year flood zones. It says how common flood-prone land is in Martin County, not whether a given parcel floods. For that, look up the zone at your exact point on the FEMA Flood Map Service Center or run the free check.

Soils and terrain

Prime farmland
0% USDA NRCS Web Soil Survey (SSURGO)
Farmland of statewide importance
0% USDA NRCS Web Soil Survey (SSURGO)
Average slope over 15%
1.4% USDA NRCS Web Soil Survey (SSURGO)
Very limited for septic absorption fields
99% USDA NRCS Web Soil Survey (SSURGO)
Not limited for septic absorption fields
0% USDA NRCS Web Soil Survey (SSURGO)

Shares of Martin County's soil-surveyed land (about 346,611 acres, open water excluded), using each map unit's dominant condition in USDA's SSURGO soil survey. Soils change within a few hundred feet, so the soil at your building site is what matters.

Farms and land use

Farms (2022)
588 USDA NASS, 2022 Census of Agriculture
Share of the county's land in farms
52% USDA NASS, 2022 Census of Agriculture
Average farm size
305 acres (median 10) USDA NASS, 2022 Census of Agriculture
Average value of land and buildings
$7,304 per acre, 28th highest of 65 in Florida USDA NASS, 2022 Census of Agriculture
Cropland
46,492 acres USDA NASS, 2022 Census of Agriculture
Pasture and rangeland
129,187 acres USDA NASS, 2022 Census of Agriculture
Woodland on farms
45,779 acres USDA NASS, 2022 Census of Agriculture
Irrigated land
18,684 acres USDA NASS, 2022 Census of Agriculture

Natural hazard ratings

FEMA's National Risk Index rates each hazard for Martin County relative to every other U.S. county. Overall risk: Relatively Moderate.

  • HurricaneVery High
  • LightningRelatively High
  • Strong windRelatively High
  • Coastal floodingRelatively Moderate
  • River and inland floodingRelatively Moderate
  • TornadoRelatively Moderate
  • WildfireRelatively Moderate
  • DroughtRelatively Low
  • HailRelatively Low
  • Heat waveRelatively Low
  • EarthquakeVery Low
  • LandslideVery Low

FEMA National Risk Index, December 2025

Questions about buying land in Martin County

How much of Martin County, FL is in a flood zone?

About 6.5% of Martin County's area is in the 1%-annual-chance (100-year) floodplain used by FEMA's National Risk Index (December 2025), 30th lowest of 67 counties in Florida. Another 1.1% is exposed to coastal flooding. Whether a given parcel is in a flood zone depends on its exact location, so check the FEMA map at your pin.

How much does land cost per acre in Martin County?

The 2022 Census of Agriculture put the average value of farm land and buildings in Martin County at $7,304 an acre, 28th highest of 65 counties in Florida (the median Florida county was $6,645). It's a self-reported average across farms, so small homesites and recreational tracts often sell for more per acre.

Will a septic system work on land in Martin County?

Often, but test first. USDA soil surveys rate 99% of Martin County's mapped soils very limited for conventional septic absorption fields, usually because of wetness, slow permeability, shallow rock or flooding. A perc or soil test on the parcel decides what system the health department will permit.

Is there good farmland in Martin County?

0% of Martin County's mapped soils are prime farmland, 0% are prime only if drained, irrigated or protected from flooding, and 0% are farmland of statewide importance (USDA SSURGO). The 2022 Census of Agriculture counted 588 farms averaging 305 acres.

How often is Martin County in drought?

Since 2021, at least half of the county was in severe drought or worse in 12% of weekly U.S. Drought Monitor maps, and in extreme drought in 5.3%. On 2026-10-27, 24% of the county was in moderate drought or worse.

Can I check a specific property in Martin County?

Yes. Enter the address or drop a pin anywhere in Martin County on the free check. It shows which checks return data at that exact point, and the full report costs $29: flood zone, slope, soils, wetlands, roads, power lines, wildfire and more, each with its source. It is a screen of public maps, not a survey, title search or perc test.

Check the parcel, not just the county

County numbers tell you what to look for. The free check looks at your exact point in Martin County: flood zone, slope, soils, wetlands, roads, power and more. The full report is $29.

Check a location in Martin County

What these numbers can't tell you

  • County shares describe Martin County as a whole; a parcel can be entirely in or out of a flood zone, wetland or poor soil.
  • It doesn't look at the whole parcel, its boundaries, title, easements, zoning or permits.
  • It isn't a survey, appraisal, elevation certificate, soil or perc test, or Phase I environmental site assessment.
  • It can't see local distribution power lines, driveways, legal access, wells or mineral rights.
  • Maps lag behind the ground, and distances are straight-line, not driving distance.

Sources and vintages

Summarized per county by our build script on 2026-10-31. County figures cover the whole county; checks on the report are at your point.