Grayson County's SSURGO septic rating

Very limited

USDA puts Grayson County, TX at "Very limited" for septic absorption fields, the dominant reading across 87.4% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 87.4% of it sits in USDA's most-constrained bucket. For scale: 932.832 square miles and 150,532 people call Grayson County home.

Before you rely on this for one lot

Grayson County's rating is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Grayson County, TX

Grayson County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.

How Grayson County, TX compares

Among the 3,058 rated counties on this site, Grayson County, TX ranks 1,514 most-constrained nationally, and 109 of 253 within Texas.

Further reading

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