Sinkhole risk in Ozaukee County, WI: Mostly deep or small

Mostly deep or small

Some soluble rock, mostly deeply buried or in a small share of the county.

On soluble rock: 96%
At or near the surface: 0%
Buried under cover: 96%

What to do about a house in Ozaukee County

Sinkholes are uncommon here; watch for new depressions after heavy rain or leaking pipes.

That works out to roughly 224 of Ozaukee County's 233 square miles on soluble rock. With about 93,956 residents (403 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 298 map points about 0.9 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Ozaukee County

The nearest county rated sinkhole country is Oceana County, MI, about 69 miles east. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Sheboygan County, WI 17 mi north · 0% at surface
Washington County, WI 21 mi west · 0% at surface
Fond du Lac County, WI 37 mi northwest · 0% at surface
Waukesha County, WI 41 mi southwest · 0% at surface
Milwaukee County, WI 41 mi south · 0% at surface
Dodge County, WI 43 mi west · 0% at surface

What Ozaukee County is built on

The largest mapped soluble unit here is the Silurian, undivided (dolostone (dolomite)), Silurian in age, covering about 88% of the county. Next is the Traverse Group at 8%.

Against the rest of Wisconsin

Ozaukee County ranks 54 of 72 in Wisconsin for soluble rock at the surface, and sits above 0% of US counties on that measure.