Septic soil in Warren County, NC, by the numbers

Somewhat limited

Soil across 78.8% of Warren County, NC rates "Somewhat limited" in USDA's septic-absorption-field interpretation. That's a middle reading: not the outright failure "very limited" soil produces, but not a clean pass either. Design changes often bridge the gap. Warren County covers 429.392 square miles and counts 19,081 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Warren County, NC at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Warren County.

System cost, conventional vs. engineered

Given Warren County's rating, plan for the engineered-system range rather than the conventional one. 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.

Warren County's rank among North Carolina counties

Nationally, Warren County, NC is the 3,050-most-constrained of 3,058 rated counties for septic soil. Within North Carolina alone it ranks 97 of 97.

Before you act on this

How this rating is built, and its real limits · How a percolation test actually works