Septic companies in Knoxville, TN

What the ground in Knoxville is like

The USDA soil survey rates mapped ground in Knoxville for septic drain-field suitability across roughly 99 square miles. About 67% of the rated ground is classed "Very limited", meaning the soil has one or more features unfavorable for a conventional drain field, and the limits generally cannot be overcome without major soil reclamation, special design or expensive installation.

In Knoxville, the leading limit is slow water movement: effluent does not drain through the soil fast enough, so a conventional field can back up or pond when the ground cannot keep pace. The survey flags that limit on about 92% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement91.7%
• Slope58.0%
• Depth to bedrock11.2%
• Depth to saturated zone8.2%

This is survey data for mapped areas, not a substitute for a site evaluation on your own lot. Conditions on a single parcel can differ from the map.

USDA NRCS SSURGO, ENG Septic Tank Absorption Fields · 66.5% Very limited · Slow water movement · 71 map units · 98.75 sq mi · read 2026-08-30