What Caswell County, NC's soil rates for a septic system

Very limited

In Caswell County, NC, 77.3% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 77.3% of it sits in USDA's most-constrained bucket. Caswell County covers 425.501 square miles and counts 22,363 residents.

This is a county figure, not a parcel figure

Caswell County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Caswell County.

System cost, conventional vs. engineered

Given Caswell 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.

Where this sits nationally

Nationally, Caswell County, NC is the 2,167-most-constrained of 3,058 rated counties for septic soil. Within North Carolina alone it ranks 42 of 97.

Further reading

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