Septic companies in Boulder, CO

What the ground in Boulder is like

The USDA soil survey rates mapped ground in Boulder for septic drain-field suitability across roughly 27 square miles. About 97% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Boulder, 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 35% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement35.4%
• Large stones31.1%
• Filtering capacity27.4%
• Seepage, bottom layer26.3%

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 · 97.4% Very limited · Slow water movement · 38 map units · 26.93 sq mi · read 2026-08-30