Need a perc test or a septic design in St. Croix County, WI? St. Croix County has about 97,954 residents (2024 estimate) and 12 incorporated cities and towns. Describe your project once: perc test and septic design pros who work in St. Croix County get back to you.
The local health department is the authority that reviews perc tests and septic permits for most of St. Croix County.
Services available in St. Croix County
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Perc test and soil evaluation
Percolation test and soil evaluation on the lot, required by the health department before a septic permit is issued.
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Septic system design
Design of the septic system from the soil results, submitted with the permit application.
Frequently asked questions in St. Croix County
Do perc test and septic design pros cover the whole of St. Croix County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Perc Testing in Wisconsin: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.