Morgan County's SSURGO septic rating
Very limited
Morgan County, IL's SSURGO dominant class comes back "Very limited", covering 62.9% of the county. 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 568.959 square miles, home to 32,618 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Morgan County, IL - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Morgan County: conventional vs. engineered cost
62.9% of Morgan 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.
Morgan County's rank among Illinois counties
Among the 3,058 rated counties on this site, Morgan County, IL ranks 2,663 most-constrained nationally, and 89 of 101 within Illinois.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems