Septic suitability in Douglas County, GA
Very limited
Douglas County, GA: USDA's soil survey calls 51.2% of the county "Very limited" for a septic leach field. 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 200.136 square miles, home to 151,887 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Douglas County, GA 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.
Douglas County: conventional vs. engineered cost
51.2% of Douglas 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.
Douglas County's rank among Georgia counties
Among the 3,058 rated counties on this site, Douglas County, GA ranks 2,855 most-constrained nationally, and 100 of 159 within Georgia.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems