Septic companies in Phoenix, AZ

What the ground in Phoenix is like

The USDA soil survey rates mapped ground in Phoenix for septic drain-field suitability across roughly 518 square miles. About 51% 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 Phoenix, 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 75% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement74.5%
• Flooding11.6%
• Slope10.4%
• Depth to bedrock10.2%

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 · 51.4% Very limited · Slow water movement · 181 map units · 518.47 sq mi · read 2026-08-30