Septic soil in Lawrence County, PA, by the numbers

Very limited

Soil across 93.8% of Lawrence County, PA rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 93.8% of it sits in USDA's most-constrained bucket. Lawrence County, PA is 357.393 square miles with a population of 84,233.

What Lawrence County's reading doesn't cover

USDA's survey covers the whole of Lawrence County, PA 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 Lawrence County will actually do.

What a system would cost here

With 93.8% of Lawrence 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 Lawrence County, PA compares

Nationally, Lawrence County, PA is the 811-most-constrained of 3,058 rated counties for septic soil. Within Pennsylvania alone it ranks 31 of 66.

Before you act on this

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