Blog · October 14, 2026 · Illinois
Using the Chester Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Ellis Grove.
Main page: Randolph County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Percy? Checking the Chester flood zone map reveals whether the lot falls inside a mapped floodplain, and it costs nothing to check. What this Chester guide covers: finding the address on FEMA's map, reading the zone codes, and confirming the outline on the county map.
The Chester flood zone map: start here
Flood zones come from FEMA's Flood Map Service Center: type an address near Ellis Grove, and choose the dynamic map. A tract near Evansville without an address is still easy to locate: pan from the closest town and click inside the land.
The free map to start with
Begin with the Randolph County ArcGIS parcel map; it maps each tax parcel in the county, Rockwood included. For acreage around Steeleville, type a street address, an owner's name or a parcel number, then pick the result to center the map on it. For land near Evansville, the parcel card usually lists the owner of record, acreage on the tax roll, the parcel number and sometimes recent sales.
A quick look at the area
Chester is the county seat, home to the main records offices. You'll also find Kaskaskia, Ellis Grove, Rockwood, and Steeleville, where town lots give way to larger tracts. About 29,815 people live in Randolph County (Census estimate, 2023) on roughly 575 square miles. Randolph County dates to 1795, and some chains of title near Ellis Grove are long.
Chester, IL: the basics
Chester is part of Randolph County, Illinois, and the county assessor maps its lots. As the county seat, Chester hosts the courthouse, handy when you need recorded documents. Local government in Chester handles matters such as zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits out by Kaskaskia generally falls under county rules rather than the town's.
Questions to ask before you buy
Request for any Elevation Certificate for the house near Evansville; getting a quote early avoids surprises.
Offices that can help
Recorded documents for a parcel near Kaskaskia sit in the index kept by the county Recorder of Deeds (in many counties the County Clerk and Recorder), usually searchable by name or document number. Zoning, permits and septic questions near Ellis Grove go to planning, building or health offices, and the answer depends on jurisdiction.
Sections, lots and bearings
Illinois follows the Public Land Survey System, so deeds around Ellis Grove reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Ellis Grove can be irregular. Write down the legal description for the tract near Kaskaskia when you talk to a surveyor.
Low spots and local drainage
Small streams around Ellis Grove may not have detailed mapping, so look for water marks and debris lines. Wetlands near Percy can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
Limits of the parcel data
Parcel lines are drawn for taxes, not measured on the ground, so a fence near Steeleville often sits a few yards off the line on screen. For a home near Kaskaskia, records update in batches, so a deed recorded last month might lag behind.
Backing up the map with records
For anything that matters, get the recorded deed through the county Recorder of Deeds (in many counties the County Clerk and Recorder); the parcel map near Kaskaskia only summarizes it. Inherited tracts around Ellis Grove can trace back through several deeds, so a title company can sort it out before a purchase.
Decoding the flood zone labels
Zone AE comes with a base flood elevation, which plain A zones lack; surveyors near Rockwood use that number. For a parcel near Percy, a shaded X area is moderate risk, roughly the 100- to 500-year range; unshaded X means minimal mapped risk.
Matching the zone to the lot lines
FEMA doesn't draw property lines, so check the Randolph County ArcGIS parcel map too to confirm you have the right parcel near Rockwood.
Lenders and permits
If a building sits in a Special Flood Hazard Area and a federally regulated lender is involved, flood insurance is generally required in communities in the NFIP, which applies near Kaskaskia as much as anywhere. New construction in a floodplain near Steeleville can trigger elevation rules; check with the county or town building office early.
Chester: common questions
Why does the BFE matter near Ellis Grove?
Short answer: a BFE near Kaskaskia tells builders how high the lowest floor should be; local rules may require building above it.
Do I need flood insurance in Chester?
In most cases, lenders generally require it for buildings near Rockwood in a Special Flood Hazard Area when the loan is federally regulated or insured; outside those zones it's your call.
How do I check the flood zone for an address in Chester?
Usually, FEMA's free map shows the zone for any spot near Steeleville; no account is needed.
Does the county parcel map show flood zones around Steeleville?
In most cases, a flood layer may appear in the Randolph County ArcGIS parcel map layer list, though it can lag behind FEMA's current panels.
What is a parcel ID near Ellis Grove?
It's the number the Supervisor of Assessments, working with township assessors uses to track a tract near Percy, and it's on the record panel and tax bills.
Open the official Randolph County, IL parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.