Morrow County, OH: the USDA septic-suitability picture
Very limited
Morrow County, OH's SSURGO dominant class comes back "Very limited", covering 99.4% of the county. Practically, that rules out a simple gravity system for most of the county - 99.4% of it sits in USDA's most-constrained bucket. The county spans 406.134 square miles, home to 35,927 people.
What this number does and doesn't tell you
Two lots a mile apart in Morrow 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.
Morrow County: conventional vs. engineered cost
99.4% of Morrow 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.
Morrow County's rank among Ohio counties
Among the 3,058 rated counties on this site, Morrow County, OH ranks 34 most-constrained nationally, and 7 of 87 within Ohio.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems