Zoning in Ozaukee County, WI: Town-by-Town Rules

Most Wisconsin counties have some form of county general zoning covering unincorporated land. Ozaukee County doesn't -- each of its six towns runs its own zoning ordinance independently, and the county's own role is limited to the statewide shoreland and floodplain mandates. Here's what that structure actually means for evaluating a specific parcel, and a live example of how fast growth pressure can move here.

This page covers what's specific to Ozaukee County. For the general explanation, see the national guide.

Six towns, six independent zoning ordinances

Wisconsin's normal county/town zoning split assumes a county has adopted general zoning that most towns have opted into, with a handful of exceptions running their own. Ozaukee County appears to run the opposite way: this research pass found independent, town-adopted zoning ordinances for all six of the county's towns. The Town of Belgium's zoning ordinance dates back to 1966 and is amended directly by its own Town Board. The Town of Cedarburg's zoning is explicitly adopted under the authority of Wis. Stat. sec. 60.61 and 62.23(7) -- the statutory basis for independent town zoning power. The Town of Grafton's zoning cites an even broader set of enabling statutes (sec. 60.61, 60.62, 61.35, and 62.23(7)). The Towns of Fredonia, Saukville, and Port Washington each separately publish and maintain their own town zoning codes as well.

The practical effect: if you're evaluating a rural parcel in Ozaukee County, the zoning district, permitted uses, setbacks, and any conditional-use or variance process are all determined and administered by that parcel's own town -- not by an Ozaukee County planning department zoning map. This is a meaningfully different research path than in most other Wisconsin counties covered by this project, where the county is usually the first call. Confirm which specific town a parcel sits in and contact that town directly; a mailing address inside a city (like Port Washington or Cedarburg) does not necessarily mean the parcel is inside that city's limits rather than the same-named surrounding town.

What the county still controls: shoreland, floodplain, and septic

None of this means Ozaukee County has no regulatory role at all. The county directly administers its Shoreland Protection Ordinance (Chapter 19 of the county code) and Floodplain Zoning Ordinance (Chapter 18) in unincorporated shoreland and floodplain areas -- both implementing statewide mandates (NR 115 shoreland zoning, and FEMA-based floodplain mapping) that apply on top of, not instead of, whatever general zoning a town has adopted. Wisconsin law doesn't let a town opt out of these statewide programs, so a parcel within 1,000 feet of Lake Michigan or an inland lake, or 300 feet of a river or stream, is subject to the county's shoreland rules regardless of which town it's in.

The county's Land & Water Management Department also administers POWTS (septic) permitting countywide under the statewide SPS 383 standard through its Sanitation and Health Ordinance (Chapter 9), and maintains a separate ordinance (Chapter 15) covering land the county itself owns. For a specific parcel, expect to make at least two calls: the town for general zoning, and the county's Land & Water Management Department for shoreland/floodplain status and septic permitting.

A live example of growth pressure: the Town of Port Washington land acquisition

Ozaukee Press and FOX6 Milwaukee have both reported on a large, active land acquisition effort in the Town of Port Washington: landowners describe a commercial real estate agent securing the right to purchase between 1,000 and 2,000 acres of mostly farmland on behalf of an undisclosed buyer described as a semiconductor manufacturer, with offers reported around $40,000-$42,000 per acre -- well above typical farmland values -- and sellers bound by non-disclosure agreements once they've agreed to sell. The area involved reportedly runs north from Knellsville at the town's border with the City of Port Washington toward Dixie Road, between I-43 and the Ozaukee Interurban Trail.

As of this research pass, the buyer's identity and specific development plans were not independently confirmed, and the situation appears to still be unfolding. What it illustrates concretely, though, is how quickly land values and land-use pressure can shift even in a small, historically rural pocket of a county otherwise known for its affluent, established Lake Michigan suburbs. Because the Town of Port Washington -- not the county -- controls the general zoning that would ultimately need to change for large-scale industrial development to proceed, any eventual rezoning fight or approval process here would run through the town's own planning process. If you're evaluating land anywhere in this specific area, check current news coverage and ask the Town of Port Washington directly about pending rezoning petitions before assuming today's rural zoning and land values are stable.

Zoning in Ozaukee County: Why the Towns, Not the County, Are in Charge

Six towns, six independent zoning ordinances

What the county still controls: shoreland, floodplain, and septic

A live example of growth pressure: the Town of Port Washington land acquisition

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