Septic soil in Bibb County, AL, by the numbers

Very limited

Soil across 91.2% of Bibb County, AL rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 91.2% of it sits in USDA's most-constrained bucket. Bibb County covers 622.47 square miles and counts 22,258 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Bibb County, AL at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Bibb County.

System cost, conventional vs. engineered

Given Bibb 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.

Bibb County's rank among Alabama counties

Nationally, Bibb County, AL is the 1,149-most-constrained of 3,058 rated counties for septic soil. Within Alabama alone it ranks 13 of 67.

Related guides

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