Bay County, MI's soil, for a septic absorption field

Very limited

95.3% of Bay County, MI's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 95.3% of Bay County's land. Bay County covers 442.41 square miles and counts 102,651 residents.

This is a county figure, not a parcel figure

Nothing about Bay County, MI's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Bay County.

System cost, conventional vs. engineered

Given Bay 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 Bay County, MI compares

Nationally, Bay County, MI is the 624-most-constrained of 3,058 rated counties for septic soil. Within Michigan alone it ranks 30 of 83.

Related guides

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