What Highlands County, FL's soil rates for a septic system
Very limited
Soil across 91.4% of Highlands County, FL rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 91.4% of it sits in USDA's most-constrained bucket. Highlands County, FL is 1,017.67 square miles with a population of 109,778.
What Highlands County's reading doesn't cover
USDA's survey covers the whole of Highlands County, FL at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Highlands County will actually do.
What a system would cost here
With 91.4% of Highlands 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.
How Highlands County, FL compares
Nationally, Highlands County, FL is the 1,114-most-constrained of 3,058 rated counties for septic soil. Within Florida alone it ranks 16 of 65.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems