Need a perc test or a septic design in Washtenaw County, MI? Washtenaw County has about 373,875 residents (2024 estimate) and 8 incorporated cities and towns. Describe your project once: perc test and septic design pros who work in Washtenaw County get back to you.
The local health department is the authority that reviews perc tests and septic permits for most of Washtenaw County.
Services available in Washtenaw 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 Washtenaw County
Do perc test and septic design pros cover the whole of Washtenaw 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 Michigan: 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.