Lenawee County's SSURGO septic rating
Very limited
USDA puts Lenawee County, MI at "Very limited" for septic absorption fields, the dominant reading across 92.2% of the county's soil. 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. The county spans 749.653 square miles, home to 97,746 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Lenawee County, MI at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Lenawee County: conventional vs. engineered cost
92.2% of Lenawee County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Lenawee County's rank among Michigan counties
Among the 3,058 rated counties on this site, Lenawee County, MI ranks 1,009 most-constrained nationally, and 49 of 83 within Michigan.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems