Natrona County's SSURGO septic rating

Very limited

USDA puts Natrona County, WY at "Very limited" for septic absorption fields, the dominant reading across 61.1% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 61.1% of Natrona County's land. For scale: 5,340.537 square miles and 80,410 people call Natrona County home.

Before you rely on this for one lot

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

Natrona 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, Natrona County, WY ranks 2,706 most-constrained nationally, and 16 of 22 within Wyoming.

Related guides

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