Blog · October 14, 2026 · Wisconsin
Using the Ozaukee County Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near Port Washington.
Main page: Ozaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before an offer near Druecker, look at the Ozaukee County flood zone map: a mapped flood zone changes insurance, building rules and resale. This county guide covers: finding the address on FEMA's map, reading the zone codes, and matching it with the county parcel viewer around Fredonia.
Getting started with the Ozaukee County flood zone map
If you'd rather pan and zoom, try the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, which applies near Bayside as much as anywhere. A tract near Lake Michigan without an address is still easy to locate: zoom in from Interstate 43 and click the spot.
Getting to the right map
Begin with the Ozaukee County parcel viewer; it covers each assessed parcel from Grafton to Fredonia. Near Decker Corner, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. In and around Waubeka, the record panel usually lists the owner of record, acreage on the tax roll, a parcel ID and sometimes recent sales.
Neighboring parcel maps
Ozaukee County borders Muskegon County, MI, Oceana County, MI, Milwaukee County, Sheboygan County, and Washington County; every one of them runs a separate parcel map. A tract near the line by Belgium can be split in two county records, so open the neighboring map before you assume the acreage. For property near Grafton, our state page lists every bordering county map across Wisconsin.
Beyond the mapped zones
Creeks and ditches near Bayside may not have detailed mapping, so walk the land after rain. Wetlands near Mequon can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
Sections, lots and bearings
Wisconsin follows the Public Land Survey System, which means a tract near Mequon is described by 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 Bayside vary in size. Write down the legal description for the tract near Waubeka for any title or survey request.
Questions to ask before you buy
If you're looking near Lion's Den Gorge Nature Preserve, request about past flood claims before closing; an insurance quote early avoids surprises.
What the map can't tell you
Tax maps are drawn for assessment, not surveyed, so the edge of a yard near Port Washington often sits some distance off the line on screen. For a parcel near Waubeka, records update in batches, so a deed recorded last month might lag behind.
Zones on the Ozaukee County flood zone map
Zone AE includes a base flood elevation (BFE), and an unnumbered A zone has none; that elevation drives building rules near Lion's Den Gorge Nature Preserve. If the land is near Port Washington, a shaded X area is moderate risk, between the 1% and 0.2% annual chance floods; plain X, or C on older maps, is minimal risk.
Lining it up with the parcel map
FEMA doesn't draw property lines, so check the Ozaukee County parcel viewer too to see exactly which lot near Belgium you're looking at.
What a flood zone means for a buyer
For a structure inside an A or V zone and a federally regulated lender is involved, mandatory purchase rules apply where the community participates in the National Flood Insurance Program, whether the land is near Dacada or elsewhere in the county. Building or adding on near Decker in a mapped zone usually means extra permit review; check with the county or town building office before you plan.
Ozaukee County in a few facts
Port Washington holds the county offices, home to the main records offices. You'll also find Cedarburg, Mequon, Bayside, and Belgium, each with its own cluster of lots. Roughly 93,460 people live in Ozaukee County (Census estimate, 2023) across roughly 233 square miles. The county dates to 1853, and some chains of title near Lake Michigan are long. Features like Lake Michigan and Lion's Den Gorge Nature Preserve are easy to spot when you zoom out from Lion's Den Gorge Nature Preserve.
Using it on a phone
The parcel map usually runs in a mobile browser, which helps when you're standing on land near Druecker, but coverage can be spotty out of town. A screenshot of the parcel near Decker Corner with its ID is a good backup.
Ozaukee County: common questions
Why did my flood zone near Fredonia change?
For most people, zones near Decker can shift when FEMA updates a panel; your community is notified before changes take effect.
What is the difference between Zone A and AE around Lion's Den Gorge Nature Preserve?
For a parcel near Fredonia, both are high-risk zones, but only AE has a base flood elevation; unnumbered A zones don't list one.
Is flood insurance mandatory near Decker Corner?
Good question; for a building near Dacada in an A or V zone with a federally backed or regulated mortgage, it's generally required, in communities that take part in the NFIP.
Is my property near Waubeka in a flood zone?
For most people, search the address near Port Washington on FEMA's Flood Map Service Center, and the zone code appears on the map.
What's the tax parcel number used for near Cedarburg?
It's the number the county real property listing office uses to track a tract near Decker; you'll see it in the viewer and on tax statements.
Open the official Ozaukee 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.