Septic soil in Red Lake County, MN, by the numbers
Very limited
In Red Lake County, MN, 98.6% 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 - 98.6% of Red Lake County lands in the strictest "very limited" bucket USDA uses. Red Lake County, MN is 432.407 square miles with a population of 3,882.
What Red Lake County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Red Lake County, MN - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Red Lake County will actually do.
What a system would cost here
With 98.6% of Red Lake 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, Red Lake County, MN is the 165-most-constrained of 3,058 rated counties for septic soil. Within Minnesota alone it ranks 4 of 86.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems