Septic companies in Great Falls, MT

What the ground in Great Falls is like

The USDA soil survey rates mapped ground in Great Falls for septic drain-field suitability across roughly 23 square miles. About 94% 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 Great Falls, 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 76% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement75.8%
• Depth to bedrock23.8%
• Slope9.7%
• Seepage, bottom layer9.3%

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 · 93.5% Very limited · Slow water movement · 66 map units · 23.16 sq mi · read 2026-08-30