Hart County, GA: the USDA septic-suitability picture
Somewhat limited
Hart County, GA's SSURGO dominant class comes back "Somewhat limited", covering 72.9% 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 232.423 square miles, home to 28,052 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Hart 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.
Hart County: conventional vs. engineered cost
72.9% of Hart 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Hart County, GA ranks 3,049 most-constrained nationally, and 159 of 159 within Georgia.
Related guides
How this rating is built, and its real limits · How a percolation test actually works