Tillman County's SSURGO septic rating

Very limited

Tillman County, OK: USDA's soil survey calls 79.6% of the county "Very limited" for a septic leach field. Practically, that rules out a simple gravity system for most of the county - 79.6% of it sits in USDA's most-constrained bucket. The county spans 871.134 square miles, home to 6,736 people.

What this number does and doesn't tell you

Tillman County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Tillman County: conventional vs. engineered cost

79.6% of Tillman 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.

How Tillman County, OK compares

Among the 3,058 rated counties on this site, Tillman County, OK ranks 2,059 most-constrained nationally, and 53 of 77 within Oklahoma.

Further reading

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