What Webster County, IA's soil rates for a septic system

Very limited

93% of Webster County, IA's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Practically, that rules out a simple gravity system for most of the county - 93% of it sits in USDA's most-constrained bucket. Webster County, IA is 715.704 square miles with a population of 36,909.

What Webster County's reading doesn't cover

USDA's survey covers the whole of Webster County, IA at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Webster County will actually do.

What a system would cost here

With 93% of Webster County rating "Very limited", a standard gravity system is not a safe assumption here. 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.

Where this sits nationally

Nationally, Webster County, IA is the 927-most-constrained of 3,058 rated counties for septic soil. Within Iowa alone it ranks 65 of 99.

Before you act on this

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