Woodford County, IL: the USDA septic-suitability picture

Very limited

USDA puts Woodford County, IL at "Very limited" for septic absorption fields, the dominant reading across 90.8% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 90.8% of it sits in USDA's most-constrained bucket. The county spans 527.557 square miles, home to 38,290 people.

What this number does and doesn't tell you

Two lots a mile apart in Woodford County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Woodford County: conventional vs. engineered cost

90.8% of Woodford 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 Woodford County, IL compares

Among the 3,058 rated counties on this site, Woodford County, IL ranks 1,183 most-constrained nationally, and 44 of 101 within Illinois.

Further reading

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