Henry County, IL Septic Rating

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, covering that same share of Henry County's land. The county spans 823 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