What Seminole County, OK's soil rates for a septic system

Very limited

89.6% of Seminole County, OK's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 89.6% of the county. Seminole County covers 632.819 square miles and counts 23,351 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Seminole County, OK 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 Seminole County.

System cost, conventional vs. engineered

Given Seminole 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.

Seminole County's rank among Oklahoma counties

Nationally, Seminole County, OK is the 1,311-most-constrained of 3,058 rated counties for septic soil. Within Oklahoma alone it ranks 19 of 77.

Related guides

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