What Lincoln County, SD's soil rates for a septic system
Very limited
In Lincoln County, SD, 72% 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 - 72% of it sits in USDA's most-constrained bucket. Lincoln County, SD is 577.293 square miles with a population of 75,244.
What Lincoln County's reading doesn't cover
Lincoln 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 Lincoln County will actually do.
What a system would cost here
With 72% of Lincoln 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.
Lincoln County's rank among South Dakota counties
Nationally, Lincoln County, SD is the 2,400-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 58 of 66.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems