Henry County, IL: the USDA septic-suitability picture

Very limited

USDA puts Henry County, IL at "Very limited" for septic absorption fields, the dominant reading across 60.4% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 60.4% of Henry County's land. The county spans 823.186 square miles, home to 48,177 people.

What this number does and doesn't tell you

Nothing about Henry County, IL's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Henry County: conventional vs. engineered cost

60.4% of Henry 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.

How Henry County, IL compares

Among the 3,058 rated counties on this site, Henry County, IL ranks 2,721 most-constrained nationally, and 92 of 101 within Illinois.

Further reading

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