Yazoo County, MS's soil, for a septic absorption field

Very limited

In Yazoo County, MS, 92.1% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 92.1% of it sits in USDA's most-constrained bucket. Yazoo County covers 922.339 square miles and counts 23,024 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Yazoo County, MS - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Yazoo County.

System cost, conventional vs. engineered

Given Yazoo 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.

Yazoo County's rank among Mississippi counties

Nationally, Yazoo County, MS is the 1,030-most-constrained of 3,058 rated counties for septic soil. Within Mississippi alone it ranks 41 of 82.

Further reading

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