Darlington County, SC's soil, for a septic absorption field

Very limited

In Darlington County, SC, 78.7% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 78.7% of Darlington County's land. Darlington County, SC is 560.629 square miles with a population of 62,425.

What Darlington County's reading doesn't cover

Darlington County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Darlington County will actually do.

What a system would cost here

With 78.7% of Darlington 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.

Where this sits nationally

Nationally, Darlington County, SC is the 2,107-most-constrained of 3,058 rated counties for septic soil. Within South Carolina alone it ranks 20 of 46.

Before you act on this

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