Warren County's SSURGO septic rating

Very limited

Warren County, NJ: USDA's soil survey calls 84.4% of the county "Very limited" for a septic leach field. 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. For scale: 356.541 square miles and 112,031 people call Warren County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Warren County, NJ - never a reading for one specific parcel. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Warren County, NJ

Warren County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.

Warren County's rank among New Jersey counties

Among the 3,058 rated counties on this site, Warren County, NJ ranks 1,742 most-constrained nationally, and 8 of 21 within New Jersey.

Before you act on this

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