Septic soil in Emmet County, IA, by the numbers

Very limited

Soil across 87.1% of Emmet County, IA rates "Very limited" in USDA's septic-absorption-field interpretation. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 87.1% of Emmet County's land. Emmet County covers 395.89 square miles and counts 9,162 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Emmet County, IA - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Emmet County.

System cost, conventional vs. engineered

Given Emmet 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 Emmet County, IA compares

Nationally, Emmet County, IA is the 1,535-most-constrained of 3,058 rated counties for septic soil. Within Iowa alone it ranks 80 of 99.

Further reading

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