Septic soil in Clark County, OH, by the numbers

Very limited

Soil across 81.3% of Clark County, OH rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 81.3% of it sits in USDA's most-constrained bucket. Clark County covers 395.879 square miles and counts 134,985 residents.

This is a county figure, not a parcel figure

Two lots a mile apart in Clark County can carry different soil, even though they share one countywide rating. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Clark County.

System cost, conventional vs. engineered

Given Clark County's rating, plan for the engineered-system range rather than the conventional one. 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.

How Clark County, OH compares

Nationally, Clark County, OH is the 1,976-most-constrained of 3,058 rated counties for septic soil. Within Ohio alone it ranks 86 of 87.

Related guides

How this rating is built, and its real limits · Conventional vs. engineered septic systems