Septic soil in Barton County, MO, by the numbers
Very limited
In Barton County, MO, 98.9% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 98.9% of Barton County lands in the strictest "very limited" bucket USDA uses. Barton County, MO is 592.03 square miles with a population of 11,717.
What Barton County's reading doesn't cover
USDA's survey covers the whole of Barton County, MO at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Barton County will actually do.
What a system would cost here
With 98.9% of Barton County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
How Barton County, MO compares
Nationally, Barton County, MO is the 110-most-constrained of 3,058 rated counties for septic soil. Within Missouri alone it ranks 17 of 114.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems