Septic soil in Carlton County, MN, by the numbers
Very limited
In Carlton County, MN, 88.1% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 88.1% of Carlton County's land. Carlton County, MN is 861.195 square miles with a population of 36,745.
What Carlton County's reading doesn't cover
Nothing about Carlton County, MN's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Carlton County will actually do.
What a system would cost here
With 88.1% of Carlton 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 Carlton County, MN compares
Nationally, Carlton County, MN is the 1,460-most-constrained of 3,058 rated counties for septic soil. Within Minnesota alone it ranks 57 of 86.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems