Pushmataha County, OK's soil, for a septic absorption field
Very limited
Soil across 84.9% of Pushmataha County, OK rates "Very limited" in USDA's septic-absorption-field interpretation. That reading means a conventional system is a poor bet here - 84.9% of Pushmataha County lands in the strictest "very limited" bucket USDA uses. Pushmataha County covers 1,395.589 square miles and counts 10,800 residents.
This is a county figure, not a parcel figure
Nothing about Pushmataha County, OK's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Pushmataha County.
System cost, conventional vs. engineered
Given Pushmataha 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.
Pushmataha County's rank among Oklahoma counties
Nationally, Pushmataha County, OK is the 1,702-most-constrained of 3,058 rated counties for septic soil. Within Oklahoma alone it ranks 36 of 77.
Before you act on this
How this rating is built, and its real limits · Conventional vs. engineered septic systems