What Ottawa County, MI's soil rates for a septic system
Very limited
93.2% of Ottawa 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. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Ottawa County, MI is 563.52 square miles with a population of 306,235.
What Ottawa County's reading doesn't cover
Nothing about Ottawa County, MI's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Ottawa County will actually do.
What a system would cost here
With 93.2% of Ottawa County rating "Very limited", a standard gravity system is not a safe assumption here. 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 Ottawa County, MI compares
Nationally, Ottawa County, MI is the 894-most-constrained of 3,058 rated counties for septic soil. Within Michigan alone it ranks 46 of 83.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems