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

Somewhat limited

In Iredell County, NC, 49.5% of the surveyed land carries a "Somewhat limited" rating for a standard septic drain field. 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. Iredell County covers 574.471 square miles and counts 206,361 residents.

This is a county figure, not a parcel figure

Nothing about Iredell County, NC's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Iredell County.

System cost, conventional vs. engineered

Given Iredell 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.

How Iredell County, NC compares

Nationally, Iredell County, NC is the 2,956-most-constrained of 3,058 rated counties for septic soil. Within North Carolina alone it ranks 89 of 97.

Further reading

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