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

Very limited

Soil across 79.6% of Collier County, FL rates "Very limited" in USDA's septic-absorption-field interpretation. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Collier County, FL is 1,997.014 square miles with a population of 416,233.

What Collier County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Collier County, FL - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Collier County will actually do.

What a system would cost here

With 79.6% of Collier 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.

Collier County's rank among Florida counties

Nationally, Collier County, FL is the 2,055-most-constrained of 3,058 rated counties for septic soil. Within Florida alone it ranks 44 of 65.

Further reading

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