Septic soil in Warren County, NY, by the numbers
Very limited
Soil across 67.9% of Warren County, NY 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 67.9% of the county. Warren County, NY is 867.222 square miles with a population of 65,288.
What Warren County's reading doesn't cover
USDA's survey covers the whole of Warren County, NY 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 Warren County will actually do.
What a system would cost here
With 67.9% of Warren 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.
Where this sits nationally
Nationally, Warren County, NY is the 2,531-most-constrained of 3,058 rated counties for septic soil. Within New York alone it ranks 58 of 61.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems