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

Very limited

In Hamilton County, TX, 91.3% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91.3% of Hamilton County's land. Hamilton County covers 835.915 square miles and counts 8,644 residents.

This is a county figure, not a parcel figure

Hamilton County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Hamilton County.

System cost, conventional vs. engineered

Given Hamilton 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.

Where this sits nationally

Nationally, Hamilton County, TX is the 1,141-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 85 of 253.

Further reading

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