What Camden County, NJ's soil rates for a septic system
Very limited
Soil across 80.7% of Camden County, NJ 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. Camden County, NJ is 221.365 square miles with a population of 533,988.
What Camden County's reading doesn't cover
USDA's survey covers the whole of Camden County, NJ 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 Camden County will actually do.
What a system would cost here
With 80.7% of Camden 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.
How Camden County, NJ compares
Nationally, Camden County, NJ is the 2,000-most-constrained of 3,058 rated counties for septic soil. Within New Jersey alone it ranks 15 of 21.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems