Blog · October 14, 2026 · Wisconsin
Port Washington Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Saukville.
Main page: Ozaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before an offer near Grafton, pull up the Port Washington flood zone map: a mapped flood zone changes insurance, permits and resale. This Port Washington guide covers: locating a parcel on FEMA's map, reading the zone codes, and pairing it with the Ozaukee County parcel viewer.
Where the Port Washington flood zone map lives
The official source is FEMA's Flood Map Service Center: search an address around Fredonia, and choose the dynamic map. A tract near Fredonia without an address is still easy to locate: zoom in from Interstate 43 and click inside the land.
Where the parcel data lives
Begin with the Ozaukee County parcel viewer; it maps every tax parcel in the county, Grafton included. If the land is near Cedarburg, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. Out toward Newburg, the record panel normally shows the owner of record, acreage on the tax roll, a parcel ID and often a sale date.
Backing up the map with records
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Newburg are filed with the Register of Deeds. Inherited tracts around Cedarburg may trace back through several deeds, and a title company is worth hiring on a real sale.
Beyond the mapped zones
Small streams around Cedarburg aren't always studied in detail, so walk the land after rain. Wetlands near Fredonia can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
Who handles what
Questions about value or the owner field for land near Cedarburg belong with the county real property listing office, since that office keeps the assessment data. Questions about what you can build around Cedarburg need the planning or permitting office, depending on whether the land is inside town limits.
A word on accuracy
Listed acreage is an estimate; just a licensed surveyor sets the real corners on land around Fredonia. For land near Newburg, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Port Washington, WI: the basics
Port Washington sits in Ozaukee County, Wisconsin, which means parcel data comes from the county. Port Washington is also the county seat, handy when you need recorded documents. For acreage around Saukville, the municipality handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Land beyond the city limits out by Fredonia often falls under county rules instead.
Questions to ask before you buy
Request for any Elevation Certificate for the house near Fredonia; getting a quote early avoids surprises.
Decoding the flood zone labels
An AE label comes with a base flood elevation, while plain Zone A does not; that elevation drives building rules near Belgium. In and around Fredonia, a low-risk label isn't a guarantee: FEMA notes that many claims come from moderate- and low-risk areas.
Use the county map alongside FEMA
FEMA doesn't draw property lines, so pair it with the Ozaukee County parcel viewer to see exactly which lot near Cedarburg you're looking at.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near Fredonia, though signal can drop in rural spots. A screenshot of the parcel near Saukville with its ID keeps working without signal.
Money questions tied to the zone
Closer to Saukville, ask for an Elevation Certificate: it records the building's elevation against the base flood. New construction in a floodplain near Belgium usually means extra permit review; call the permitting office before you plan.
Legal descriptions in Wisconsin
Wisconsin follows the Public Land Survey System, which means a tract near Fredonia is described by section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near Fredonia vary in size. Copy the legal description from the record for the parcel near Cedarburg for any title or survey request.
Ozaukee County in a few facts
Port Washington is the county seat, which is where the courthouse records live. You'll also find Saukville, Grafton, Fredonia, and Cedarburg, where town lots give way to larger tracts. Around 93,460 people live in Ozaukee County (Census estimate, 2023) across about 233 square miles. Ozaukee County dates to 1853, and some chains of title near Newburg are long. Features like Lake Michigan and Lion's Den Gorge Nature Preserve make handy reference points on the map near Newburg.
Port Washington: common questions
What is a base flood elevation near Grafton?
For most people, the BFE is printed in AE zones on FEMA's map; surveyors near Cedarburg use it often.
Is Zone X safe from flooding around Newburg?
It depends, but X zones around Fredonia are lower risk, not no risk, and floods still happen outside high-risk zones.
What does an AE label mean for a lot near Saukville?
It depends, but an AE zone has a 1% annual chance of flooding and a base flood elevation, which shapes building rules near Belgium.
Where can I see the Port Washington flood zone map for free?
FEMA's free map shows the zone for any spot near Newburg; then confirm the parcel on the county viewer.
Is there an app for the parcel map near Cedarburg?
No app is needed for most county viewers; load it before you lose coverage near Fredonia.
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.