Pinellas County, FL: no USDA soil-survey match
Unrated
The dominant soil here (often already-developed urban land) carries no septic-suitability interpretation from USDA - too rare a gap to guess at. A local percolation test is the only way to know. Pinellas County, FL covers 273.793 square miles and is home to 965,870 people, but the dominant soil here carries no SSURGO absorption-field interpretation to report.
This is a county figure, not a parcel figure
Two lots a mile apart in Pinellas County can carry different soil, even though they share one countywide rating. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Pinellas County.
System cost, conventional vs. engineered
With no SSURGO rating to go on, Pinellas County has no county-level steer either way on system cost. Nationally, conventional systems run $3,000-$8,000 and engineered alternatives run $10,000-$40,000 - which one applies to a lot in Pinellas County is exactly what a perc test settles.
Before you act on this
How this rating is built, and its real limits · What to check before buying rural land on septic