Randolph County, MO's soil, for a septic absorption field

Very limited

98.2% of Randolph County, MO's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 98.2% of Randolph County lands in the strictest "very limited" bucket USDA uses. Randolph County covers 482.713 square miles and counts 24,077 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Randolph County, MO at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Randolph County.

System cost, conventional vs. engineered

Given Randolph County's rating, plan for the engineered-system range rather than the conventional one. 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 Randolph County, MO compares

Nationally, Randolph County, MO is the 218-most-constrained of 3,058 rated counties for septic soil. Within Missouri alone it ranks 29 of 114.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems