Septic companies in Collinsville, IL

What the ground in Collinsville is like

The USDA soil survey rates mapped ground in Collinsville for septic drain-field suitability across roughly 15 square miles. About 77% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Collinsville, 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 100% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement99.6%
• Depth to saturated zone49.9%
• Flooding39.3%
• Slope34.8%

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 · 76.5% Very limited · Slow water movement · 70 map units · 15.44 sq mi · read 2026-08-30