Cass County, IA's soil, for a septic absorption field

Very limited

In Cass County, IA, 98.5% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 98.5% of the county. Cass County covers 564.258 square miles and counts 13,024 residents.

This is a county figure, not a parcel figure

Nothing about Cass County, IA's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Cass County.

System cost, conventional vs. engineered

Given Cass 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 Cass County, IA compares

Nationally, Cass County, IA is the 174-most-constrained of 3,058 rated counties for septic soil. Within Iowa alone it ranks 15 of 99.

Further reading

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