What Ingham County, MI's soil rates for a septic system
Very limited
In Ingham County, MI, 90.9% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 90.9% of Ingham County's land. Ingham County covers 556.081 square miles and counts 290,427 residents.
This is a county figure, not a parcel figure
Ingham County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Ingham County.
System cost, conventional vs. engineered
Given Ingham County's rating, plan for the engineered-system range rather than the conventional one. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
Where this sits nationally
Nationally, Ingham County, MI is the 1,174-most-constrained of 3,058 rated counties for septic soil. Within Michigan alone it ranks 57 of 83.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems