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 - 99.2% of Coal County lands in the strictest "very limited" bucket USDA uses. The county spans 516.772 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