Noble County, OK's soil, for a septic absorption field

Very limited

Soil across 83.1% of Noble County, OK rates "Very limited" in USDA's septic-absorption-field interpretation. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 83.1% of Noble County's land. Noble County covers 731.712 square miles and counts 10,896 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Noble County, OK - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Noble County.

System cost, conventional vs. engineered

Given Noble 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.

Noble County's rank among Oklahoma counties

Nationally, Noble County, OK is the 1,850-most-constrained of 3,058 rated counties for septic soil. Within Oklahoma alone it ranks 42 of 77.

Before you act on this

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