What Indian River County, FL's soil rates for a septic system
Very limited
Soil across 90.7% of Indian River County, FL rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 90.7% of it sits in USDA's most-constrained bucket. Indian River County, FL is 502.555 square miles with a population of 172,139.
What Indian River County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Indian River 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 Indian River County will actually do.
What a system would cost here
With 90.7% of Indian River 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.
Indian River County's rank among Florida counties
Nationally, Indian River County, FL is the 1,191-most-constrained of 3,058 rated counties for septic soil. Within Florida alone it ranks 19 of 65.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems