Septic companies in Chehalis, WA

What the ground in Chehalis is like

The USDA soil survey rates mapped ground in Chehalis for septic drain-field suitability across roughly 5.8 square miles. About 100% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Chehalis, 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 78% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement77.9%
• Depth to saturated zone54.0%
• Ponding29.0%
• Flooding28.3%

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 · 100% Very limited · Slow water movement · 28 map units · 5.81 sq mi · read 2026-08-30