Dubuque County, IA Septic Rating

Septic suitability in Dubuque County, IA

Very limited

USDA puts Dubuque County, IA at "Very limited" for septic absorption fields, the dominant reading across 88.3% of the county's soil. Expect the ground itself to work against a plain gravity system; that share is already USDA's strictest bucket, not a lesser constraint layered on top. For scale: 608 square miles and 99,242 people call Dubuque County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Dubuque County, IA - never a reading for one specific parcel. 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 Dubuque County, IA

Dubuque 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.

Dubuque County's rank among Iowa counties

Among the 3,058 rated counties on this site, Dubuque County, IA ranks 1,435 most-constrained nationally, and 77 of 99 within Iowa.

Related guides

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