Blog · October 14, 2026 · Wisconsin
Delavan Flood Zone Map, Wisconsin: a practical guide
The zone on FEMA's map affects insurance, building and resale near Fontana-on-Geneva Lake.
Main page: Walworth County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Weighing a property around Walworth? Checking the Delavan flood zone map reveals whether the lot falls inside a mapped floodplain, and no account is needed. Covered here for Delavan: locating a parcel on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
Checking the Delavan flood zone map step by step
The official source is FEMA's Flood Map Service Center: type an address near Walworth, and choose the dynamic map. Rural land near Elkhorn with no street number can still be found: search the nearest road and click inside the land.
Getting to the right map
Property in and around Fontana-on-Geneva Lake can be looked up on the Walworth County parcel viewer, which opens without registering. If you're looking near Sharon, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. On ground around Williams Bay, write down the parcel ID from that panel; each records desk in the county asks for it first.
Delavan and the county around it
Delavan is part of Walworth County, Wisconsin, so its parcels are on the county's map. For a home near Elkhorn, city or town hall handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Acreage past the town limits near Sharon generally follows county rules instead.
A quick look at the area
Elkhorn serves as the county seat, home to the main records offices. You'll also find Darien, Williams Bay, and Fontana-on-Geneva Lake. About 105,822 people live in Walworth County (Census Bureau estimate, 2023) on roughly 555 square miles. Walworth County was formed in 1839, which matters when you trace an old farm's title.
Neighboring parcel maps
Walworth County borders Boone County, IL, McHenry County, IL, Jefferson County, Kenosha County, and Racine County, all with their own assessor records. Ground near Elkhorn that runs to the line can show up in two county records, so open the adjacent map as well. For a tract near Sharon, the Platbookmapper state page links every bordering county map across Wisconsin.
What to request from a seller
Request whether the home has flooded on the property near Darien; an insurance quote early keeps the budget honest.
Where the recorded documents are
Before you sign anything, get the recorded deed from the Register of Deeds; the parcel map near Elkhorn only summarizes it. Older tracts around Fontana-on-Geneva Lake can go back through many deeds, so a title company can sort it out before a purchase.
A word on accuracy
Acreage on the record is a tax-roll number; just a licensed surveyor establishes the real corners for a parcel near Fontana-on-Geneva Lake. For acreage around Williams Bay, records update in batches, so a deed recorded last month can take weeks to appear.
Beyond the mapped zones
Low-lying fields near Darien may not have detailed mapping, so walk the land after rain. Marshy spots near Sharon can limit building too; check the National Wetlands Inventory mapper for a first look.
What the zone letters mean
Out toward Williams Bay, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. With a lot near Elkhorn, a low-risk label isn't a guarantee: FEMA notes that many claims come from moderate- and low-risk areas.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the Walworth County parcel viewer too for the outline of the tract near Williams Bay.
What a flood zone means for a buyer
If the land is near Walworth, ask for an Elevation Certificate: it records the building's elevation against the base flood. New construction in a floodplain near Elkhorn can trigger elevation rules; call the permitting office early.
Reading the legal description
Wisconsin is laid out under the Public Land Survey System, so rural legal descriptions near Darien cite section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though real sections near Williams Bay vary in size. Copy the legal description from the record for the parcel near Darien before you request a deed or survey.
Frequently asked
How often are flood maps updated near Sharon?
Good question; a new study can move a zone line near Williams Bay; your community is notified before changes take effect.
Is AE a high-risk flood zone near Darien?
Both are high-risk zones, but only AE has a base flood elevation, so builders near Darien design to that elevation.
Can I challenge a flood zone near Fontana-on-Geneva Lake?
It depends, but you can ask FEMA for a LOMA if surveyed elevations show the building near Elkhorn is above the BFE, and lenders accept the result.
Can I see flood zones on the Walworth County parcel viewer?
For most people, a flood layer may appear in the Walworth County parcel viewer layer list, but FEMA's own map is the official source.
Where do I ask about an assessment near Williams Bay?
The county real property listing office handles values and the tax roll, and the Register of Deeds keeps deeds; planning offices cover zoning near Williams Bay
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.