What Holmes County, FL's soil rates for a septic system
Very limited
Soil across 86% of Holmes County, FL rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 86% of the county. Holmes County covers 478.858 square miles and counts 19,876 residents.
This is a county figure, not a parcel figure
Holmes County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Holmes County.
System cost, conventional vs. engineered
Given Holmes County's rating, plan for the engineered-system range rather than the conventional one. 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 Holmes County, FL compares
Nationally, Holmes County, FL is the 1,620-most-constrained of 3,058 rated counties for septic soil. Within Florida alone it ranks 33 of 65.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems