Harrison County, TX's soil, for a septic absorption field

Very limited

Soil across 91.6% of Harrison County, TX rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 91.6% of it sits in USDA's most-constrained bucket. Harrison County, TX is 900.064 square miles with a population of 71,370.

What Harrison County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Harrison 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 Harrison County will actually do.

What a system would cost here

With 91.6% of Harrison 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 Harrison County, TX compares

Nationally, Harrison County, TX is the 1,095-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 78 of 253.

Further reading

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