Miller County, MO Septic Rating
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; that share is already USDA's strictest bucket, not a lesser constraint layered on top. The county spans 593 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