What Lawrence County, SD's soil rates for a septic system
Very limited
In Lawrence County, SD, 89.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 89.6% of Lawrence County lands in the strictest "very limited" bucket USDA uses. Lawrence County, SD is 800.053 square miles with a population of 28,809.
What Lawrence County's reading doesn't cover
Two lots a mile apart in Lawrence County can carry different soil, even though they share one countywide rating. 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 89.6% 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, SD compares
Nationally, Lawrence County, SD is the 1,310-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 28 of 66.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems