Septic companies in Coos Bay, OR

What the ground in Coos Bay is like

The USDA soil survey rates mapped ground in Coos Bay for septic drain-field suitability across roughly 11 square miles. About 98% 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 Coos Bay, 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 91% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement91.2%
• Slope66.0%
• Seepage, bottom layer49.7%
• Depth to bedrock36.2%

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 · 98.4% Very limited · Slow water movement · 35 map units · 10.63 sq mi · read 2026-08-30