Columbia County, FL's soil, for a septic absorption field

Very limited

In Columbia County, FL, 88.7% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 88.7% of the county. Columbia County, FL is 797.377 square miles with a population of 73,977.

What Columbia County's reading doesn't cover

USDA's survey covers the whole of Columbia 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 Columbia County will actually do.

What a system would cost here

With 88.7% of Columbia 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.

Columbia County's rank among Florida counties

Nationally, Columbia County, FL is the 1,395-most-constrained of 3,058 rated counties for septic soil. Within Florida alone it ranks 29 of 65.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems