Blog · October 14, 2026 · Wisconsin
Using the Elkhorn Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Delavan.
Main page: Walworth County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before you buy or build near Delavan, pull up the Elkhorn flood zone map: the zone on that map shapes insurance, building rules and resale. What this Elkhorn guide covers: locating a parcel on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
The Elkhorn flood zone map: start here
Flood zones come from FEMA's Flood Map Service Center: search an address around Delavan, and choose the dynamic map. A tract near Walworth without an address can still be found: zoom in from Interstate 43 then click the parcel area.
Pulling up a parcel
Your first stop is the Walworth County parcel viewer; it covers each tax parcel around Walworth and Williams Bay. Without an address in hand, zoom in from Walworth and select the outline. For a tract near Lake Geneva, the record panel normally shows the owner of record, assessed acreage, the parcel number and often a sale date.
Who handles what
Questions about value or the owner field for land near Walworth belong with the county real property listing office, since that office keeps the assessment data. Zoning, permits and septic questions near Fontana-on-Geneva Lake are for the local planning and health departments, and the answer depends on jurisdiction.
City limits and county records
Elkhorn sits in Walworth County, Wisconsin, so its parcels are on the county's map. Elkhorn is also the county seat, so deeds and plats are filed in town. Out toward Lake Geneva, the municipality handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Land beyond the city limits near Walworth usually falls under county rules, not municipal ones.
Backing up the map with records
The map is an index, not the title: deeds, plats and easements covering ground around Delavan sit with the Register of Deeds. Inherited tracts around Delavan may go back through many deeds, so a title company can sort it out if money is changing hands.
How land is described here
Wisconsin is laid out under the Public Land Survey System, which means a tract near Delavan is described by section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Williams Bay odd-sized. Keep the legal description for land near Lake Geneva for any title or survey request.
Beyond the mapped zones
Low-lying fields near Walworth may not have detailed mapping, so walk the land after rain. Wet ground around Fontana-on-Geneva Lake is a separate issue from flood zones; check the National Wetlands Inventory mapper for a first look.
What to request from a seller
Ask the listing agent whether the home has flooded for the house near Walworth; getting a quote early keeps the budget honest.
Decoding the flood zone labels
With a lot near Williams Bay, zones beginning with A or V mark the Special Flood Hazard Area, meaning a 1% or greater chance of flooding each year. For property near Lake Geneva, a low-risk label isn't a guarantee: FEMA notes that floods happen outside mapped zones too.
Getting your bearings
Elkhorn is the county seat, which is where the courthouse records live. You'll also find Delavan, Williams Bay, Lake Geneva, and Fontana-on-Geneva Lake, each with its own cluster of lots. About 105,822 people live in Walworth County (Census Bureau estimate, 2023) on some 555 square miles. Walworth County was formed in 1839, which matters when you trace an old farm's title.
Matching the zone to the lot lines
Where a floodplain cuts across acreage near Fontana-on-Geneva Lake, the structure's footprint is the key question.
Lenders and permits
On ground around Lake Geneva, get the Elevation Certificate if one exists: it compares the building to the BFE. New construction in a floodplain near Fontana-on-Geneva Lake usually means extra permit review; check with the county or town building office early.
Next door to Walworth County
Walworth County touches Boone County, IL, McHenry County, IL, Jefferson County, Kenosha County, and Racine County, all with their own assessor records. A tract near the line by Williams Bay may be split in two county records, so look at the adjacent map too. For a home near Delavan, our state page links each neighboring county map for Wisconsin.
Elkhorn: common questions
What is a LOMA around Delavan?
It depends, but FEMA's LOMA process is the usual route when a building near Lyons sits above the base flood elevation, and lenders accept the result.
How often are flood maps updated around Walworth?
It depends, but zones near Williams Bay can shift when FEMA updates a panel; check the effective date on the panel.
Will my lender require flood insurance near Fontana-on-Geneva Lake?
For most people, lenders generally require it for buildings near Fontana-on-Geneva Lake in a Special Flood Hazard Area when the loan is federally regulated or insured; elsewhere it's optional.
What is a base flood elevation for land near Fontana-on-Geneva Lake?
Usually, a BFE near Lake Geneva tells builders how high the lowest floor should be; surveyors near Delavan use it often.
Is the parcel map a survey around Lyons?
No; boundary questions near Delavan need a licensed surveyor.
Open the official Walworth County, WI 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.