Delaware County, IA: the USDA septic-suitability picture

Very limited

Delaware County, IA's SSURGO dominant class comes back "Very limited", covering 96.1% of the county. Practically, that rules out a simple gravity system for most of the county - 96.1% of it sits in USDA's most-constrained bucket. For scale: 577.685 square miles and 17,609 people call Delaware County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Delaware 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 Delaware County, IA

Delaware 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.

How Delaware County, IA compares

Among the 3,058 rated counties on this site, Delaware County, IA ranks 516 most-constrained nationally, and 38 of 99 within Iowa.

Further reading

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