Check land in Illinois before you buy

Flood zone, slope, soils, wetlands, roads, power and wildfire for any point in Illinois, written up in plain English with the source next to every value. Check the Land, powered by Isopleth.

Check a location in Illinois See a sample report

What the $29 report covers in Illinois

You drop a pin or enter an address anywhere in Illinois. The screen asks about 75 questions of public datasets at that point and within stated search radii, then explains each answer and names its source.

Hazards: FEMA flood zone and floodplain, wildfire, tornado and hail frequency, landslide, seismic and wind design values
Terrain & soils: slope, elevation, soil drainage and farmland class
Infrastructure & access: nearest roads, high-voltage lines, substations and gas pipelines, water and sewer service, fire stations, hospitals and schools
Environment: wetlands and streams, protected land and critical habitat, Superfund, brownfield and leaking-tank sites, dams

The free preview checks coverage first: how many checks returned a value at your point and which sources had nothing there. If too much core data is missing, it says so rather than selling you a thin report. How it works.

Real example values in Illinois

These are values the Isopleth API (the data engine behind the report) returned on 2026-10-29 at the Census Bureau's interior point of Illinois's 3 largest counties by land area. They show what the report reads, not what your land has: values change within a few hundred feet, so check your own pin.

Check	McLean County	LaSalle County	Iroquois County
Hazards
FEMA flood zone	X	X	X
Inside a mapped floodplain	No	No	No
Wildfire frequency (tract average)	0.000037 a year	0.00012 a year	0.000025 a year
Tornado frequency (tract average)	0.18 a year	0.11 a year	0.17 a year
Hail frequency (tract average)	3.3 a year	4.3 a year	2.8 a year
Terrain & soils
Elevation	820 ft (250 m)	476 ft (145 m)	647 ft (197 m)
Slope	2.5°	0.8°	0.5°
Soil drainage	Somewhat poorly drained	Poorly drained	Poorly drained
Farmland class	Prime	Prime if conditions met	Prime if conditions met
Infrastructure & access
Nearest major road	795 m (2,609 ft)	0.7 mi (1.1 km)	1.5 mi (2.4 km)
Nearest high-voltage transmission line	1.0 mi (1.6 km)	no data	791 m (2,594 ft)
Nearest substation	2.7 mi (4.4 km)	2.2 mi (3.5 km)	5.2 mi (8.4 km)
Nearest interstate gas pipeline	3.7 mi (5.9 km)	1.8 mi (2.9 km)	874 m (2,866 ft)
In a public water service area	No	No	No
Nearest fire station	3.7 mi (5.9 km)	0.8 mi (1.2 km)	5.7 mi (9.2 km)
Nearest hospital	4.6 mi (7.5 km)	2.9 mi (4.7 km)	5.5 mi (8.8 km)
Nearest school	2.6 mi (4.2 km)	1.6 mi (2.5 km)	1.7 mi (2.7 km)
Environment
On a mapped wetland	No	No	No
Nearest mapped wetland	no data	24 m (80 ft)	435 m (1,428 ft)
On protected land	No	No	No

Frequencies are FEMA National Risk Index annual averages for the Census tract. "No data" means that dataset had nothing at that point, and the report would list it as a gap.

What it can't tell you

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.

Common questions

Does Check the Land work in Illinois?

Yes. The screen runs at any point in Illinois that you choose by address or coordinates. Coverage varies from place to place, so the free preview shows which checks returned data at your point before you pay.

Is the FEMA flood map available everywhere in Illinois?

A FEMA flood zone came back at all 3 of our sample points in Illinois, but some rural areas have no digital FEMA map. The preview tells you if your point is one of them, and the report then says the flood zone is unknown rather than calling it safe.

What does the $29 report check in Illinois?

About 75 checks at your point and set search radii: flood zone and floodplain, slope, elevation and soils, wetlands and streams, protected land and critical habitat, wildfire, tornado and hail frequency, the nearest roads (one came back at all 3 of our sample points), transmission lines, substations and gas pipelines, water and sewer service areas, nearby fire stations, hospitals and schools, and EPA-listed sites such as Superfund and leaking tanks.

Is this a survey, title search or Phase I?

No. It is a preliminary screen of mapped public data at one point. It does not look at the whole parcel, its boundaries, title, easements, zoning or permits, and it is not a survey, appraisal, soil or perc test or Phase I environmental site assessment.

How much does it cost?

The preview is free. The full report is $29 per location (initial test price), one payment with no subscription.

Looking at land in Illinois?

Run the free preview first. It shows what data exists at your point. The full report is $29 (initial test price). Questions: [email protected].

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