King County, TX: the USDA septic-suitability picture

Very limited

King County, TX: USDA's soil survey calls 77.6% of the county "Very limited" for a septic leach field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 77.6% of the county. For scale: 910.873 square miles and 215 people call King County home.

Before you rely on this for one lot

Nothing about King County, TX's SSURGO figure applies to a specific address - it's a county-wide average. 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 King County, TX

King 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.

King County's rank among Texas counties

Among the 3,058 rated counties on this site, King County, TX ranks 2,157 most-constrained nationally, and 162 of 253 within Texas.

Related guides

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