Septic suitability in Texas County, OK
Somewhat limited
Texas County, OK's SSURGO dominant class comes back "Somewhat limited", covering 48.9% of the county. Modification usually rescues a conventional system at this rating - added fill or a larger field - rather than forcing a full engineered redesign. The county spans 2,041.293 square miles, home to 20,577 people.
What this number does and doesn't tell you
Texas 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.
Texas County: conventional vs. engineered cost
48.9% of Texas County carrying a "Somewhat 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 Texas County, OK compares
Among the 3,058 rated counties on this site, Texas County, OK ranks 2,922 most-constrained nationally, and 76 of 77 within Oklahoma.
Further reading
How this rating is built, and its real limits · How a percolation test actually works