Seminole County, GA's soil, for a septic absorption field
Very limited
58.7% of Seminole County, GA's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 58.7% of Seminole County's land. Seminole County, GA is 237.551 square miles with a population of 9,274.
What Seminole County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Seminole County, GA - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Seminole County will actually do.
What a system would cost here
With 58.7% of Seminole County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
Where this sits nationally
Nationally, Seminole County, GA is the 2,745-most-constrained of 3,058 rated counties for septic soil. Within Georgia alone it ranks 84 of 159.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems