What Phillips County, MT's soil rates for a septic system
Very limited
81.1% of Phillips County, MT's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Practically, that rules out a simple gravity system for most of the county - 81.1% of it sits in USDA's most-constrained bucket. Phillips County, MT is 5,140.422 square miles with a population of 4,214.
What Phillips County's reading doesn't cover
Phillips 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 Phillips County will actually do.
What a system would cost here
With 81.1% of Phillips 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.
Phillips County's rank among Montana counties
Nationally, Phillips County, MT is the 1,989-most-constrained of 3,058 rated counties for septic soil. Within Montana alone it ranks 28 of 54.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems