What McLean County, ND's soil rates for a septic system
Somewhat limited
Soil across 59.1% of McLean County, ND rates "Somewhat limited" in USDA's septic-absorption-field interpretation. It's a soil condition contractors work around routinely, with a bigger field or added fill, rather than one that forces an engineered system outright. McLean County, ND is 2,110.272 square miles with a population of 9,845.
What McLean County's reading doesn't cover
USDA's survey covers the whole of McLean County, ND at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in McLean County will actually do.
What a system would cost here
With 59.1% of McLean County rating "Somewhat 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 McLean County, ND compares
Nationally, McLean County, ND is the 3,018-most-constrained of 3,058 rated counties for septic soil. Within North Dakota alone it ranks 52 of 53.
Related guides
How this rating is built, and its real limits · How a percolation test actually works