Septic suitability in Upshur County, TX
Very limited
Upshur County, TX's SSURGO dominant class comes back "Very limited", covering 94% of the county. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. The county spans 582.98 square miles, home to 44,050 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Upshur County, TX at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Upshur County: conventional vs. engineered cost
94% of Upshur 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Upshur County, TX ranks 785 most-constrained nationally, and 53 of 253 within Texas.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems