What Kendall County, IL's soil rates for a septic system

Very limited

98.6% of Kendall County, IL's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 98.6% of Kendall County lands in the strictest "very limited" bucket USDA uses. Kendall County, IL is 320.243 square miles with a population of 143,171.

What Kendall County's reading doesn't cover

Nothing about Kendall County, IL'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 Kendall County will actually do.

What a system would cost here

With 98.6% of Kendall 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.

Kendall County's rank among Illinois counties

Nationally, Kendall County, IL is the 142-most-constrained of 3,058 rated counties for septic soil. Within Illinois alone it ranks 8 of 101.

Before you act on this

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