Coal County, OK Septic Rating
Septic suitability in Coal County, OK
Very limited
Coal County, OK: USDA's soil survey calls 99.2% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - it's already USDA's strictest "very limited" bucket, not a partial constraint. The county spans 517 square miles, home to 5,414 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Coal County, OK - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Coal County: conventional vs. engineered cost
99.2% of Coal County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Coal County's rank among Oklahoma counties
Among the 3,058 rated counties on this site, Coal County, OK ranks 72 most-constrained nationally, and 1 of 77 within Oklahoma.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems