Septic suitability in Lyon County, MN
Very limited
Lyon County, MN: USDA's soil survey calls 96.7% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 96.7% of Lyon County lands in the strictest "very limited" bucket USDA uses. The county spans 714.411 square miles, home to 25,577 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Lyon County, MN at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Lyon County: conventional vs. engineered cost
96.7% of Lyon County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Lyon County's rank among Minnesota counties
Among the 3,058 rated counties on this site, Lyon County, MN ranks 417 most-constrained nationally, and 14 of 86 within Minnesota.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems