What Ionia County, MI's soil rates for a septic system

Very limited

Soil across 96% of Ionia County, MI rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 96% of it sits in USDA's most-constrained bucket. Ionia County covers 571.32 square miles and counts 66,250 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Ionia 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 Ionia County.

System cost, conventional vs. engineered

Given Ionia 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 Ionia County, MI compares

Nationally, Ionia County, MI is the 527-most-constrained of 3,058 rated counties for septic soil. Within Michigan alone it ranks 23 of 83.

Before you act on this

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