DeKalb County, MO: no USDA soil-survey match
Unrated
Unlike most of the 3,144 counties on this site, DeKalb County, MO has nothing to show: This county has no matching soil survey data - too rare a gap to guess at. A local percolation test is the only way to know.
What this number does and doesn't tell you
Two lots a mile apart in DeKalb County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
DeKalb County: conventional vs. engineered cost
With no SSURGO rating to go on, DeKalb County has no county-level steer either way on system cost. Conventional systems typically run $3,000-$8,000; where the soil doesn't allow one, engineered alternatives run $10,000-$40,000. A perc test decides which range applies.
Further reading
How this rating is built, and its real limits · What to check before buying rural land on septic