Septic suitability in Miller County, MO
Very limited
USDA puts Miller County, MO at "Very limited" for septic absorption fields, the dominant reading across 96.7% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 96.7% of the county. The county spans 592.582 square miles, home to 25,668 people.
What this number does and doesn't tell you
Nothing about Miller County, MO's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Miller County: conventional vs. engineered cost
96.7% of Miller 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Miller County, MO ranks 416 most-constrained nationally, and 38 of 114 within Missouri.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems