What Livingston County, NY's soil rates for a septic system
Very limited
Soil across 91.8% of Livingston County, NY rates "Very limited" in USDA's septic-absorption-field interpretation. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91.8% of Livingston County's land. Livingston County, NY is 631.653 square miles with a population of 61,561.
What Livingston County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Livingston County, NY - 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 Livingston County will actually do.
What a system would cost here
With 91.8% of Livingston 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, Livingston County, NY is the 1,063-most-constrained of 3,058 rated counties for septic soil. Within New York alone it ranks 25 of 61.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems