Adair County's SSURGO septic rating
Very limited
Adair County, MO: USDA's soil survey calls 99.4% of the county "Very limited" for a septic leach field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 99.4% of Adair County's land. The county spans 567.324 square miles, home to 25,660 people.
What this number does and doesn't tell you
Nothing about Adair County, MO'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.
Adair County: conventional vs. engineered cost
99.4% 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, MO ranks 36 most-constrained nationally, and 5 of 114 within Missouri.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems