Allamakee County's SSURGO septic rating

Very limited

Allamakee County, IA's SSURGO dominant class comes back "Very limited", covering 93.3% of the county. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 93.3% of the county. For scale: 639.071 square miles and 14,184 people call Allamakee County home.

Before you rely on this for one lot

USDA's survey covers the whole of Allamakee County, IA at once, not any single address. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Allamakee County, IA

Allamakee County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Allamakee County, IA ranks 891 most-constrained nationally, and 64 of 99 within Iowa.

Related guides

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