Septic soil in Osceola County, MI, by the numbers

Very limited

Soil across 94.4% of Osceola County, MI rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 94.4% of the county. Osceola County covers 566.291 square miles and counts 23,484 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Osceola County, MI at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Osceola County.

System cost, conventional vs. engineered

Given Osceola 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.

How Osceola County, MI compares

Nationally, Osceola County, MI is the 729-most-constrained of 3,058 rated counties for septic soil. Within Michigan alone it ranks 37 of 83.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems