Septic soil in Crosby County, TX, by the numbers
Very limited
67.3% of Crosby County, TX's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 67.3% of Crosby County's land. Crosby County, TX is 900.199 square miles with a population of 5,030.
What Crosby County's reading doesn't cover
Nothing about Crosby County, TX's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Crosby County will actually do.
What a system would cost here
With 67.3% of Crosby 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.
Where this sits nationally
Nationally, Crosby County, TX is the 2,554-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 205 of 253.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems