Septic suitability in Montgomery County, IA

Very limited

USDA puts Montgomery County, IA at "Very limited" for septic absorption fields, the dominant reading across 98.7% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 98.7% of it sits in USDA's most-constrained bucket. The county spans 424.097 square miles, home to 10,063 people.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Montgomery County, IA - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Montgomery County: conventional vs. engineered cost

98.7% of Montgomery County carrying a "Very limited" reading changes the realistic budget here. 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, Montgomery County, IA ranks 136 most-constrained nationally, and 11 of 99 within Iowa.

Before you act on this

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