Adair County, MO Septic Rating
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, covering that same share of Adair County's land. The county spans 567 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