What Lee County, TX's soil rates for a septic system
Very limited
Soil across 80.7% of Lee 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 80.7% of Lee County's land. Lee County covers 629.058 square miles and counts 18,451 residents.
This is a county figure, not a parcel figure
Two lots a mile apart in Lee County can carry different soil, even though they share one countywide rating. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Lee County.
System cost, conventional vs. engineered
Given Lee County's rating, plan for the engineered-system range rather than the conventional one. 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 Lee County, TX compares
Nationally, Lee County, TX is the 2,005-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 149 of 253.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems