Flagler County's SSURGO septic rating
Very limited
USDA puts Flagler County, FL at "Very limited" for septic absorption fields, the dominant reading across 93.3% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 93.3% of it sits in USDA's most-constrained bucket. The county spans 486.191 square miles, home to 136,744 people.
What this number does and doesn't tell you
Flagler County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Flagler County: conventional vs. engineered cost
93.3% of Flagler 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, Flagler County, FL ranks 882 most-constrained nationally, and 14 of 65 within Florida.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems