Septic soil in Robertson County, TX, by the numbers

Very limited

Soil across 71% of Robertson County, TX rates "Very limited" in USDA's septic-absorption-field interpretation. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 71% of Robertson County's land. Robertson County, TX is 855.155 square miles with a population of 17,659.

What Robertson County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Robertson County, TX - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Robertson County will actually do.

What a system would cost here

With 71% of Robertson 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.

How Robertson County, TX compares

Nationally, Robertson County, TX is the 2,433-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 195 of 253.

Before you act on this

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