Adair County's SSURGO septic rating
Very limited
Adair County, KY's SSURGO dominant class comes back "Very limited", covering 82.3% of the county. That reading means a conventional system is a poor bet here - 82.3% of Adair County lands in the strictest "very limited" bucket USDA uses. The county spans 405.292 square miles, home to 19,239 people.
What this number does and doesn't tell you
Two lots a mile apart in Adair 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.
Adair County: conventional vs. engineered cost
82.3% of Adair 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Adair County, KY ranks 1,907 most-constrained nationally, and 85 of 119 within Kentucky.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems