Septic companies in Longview, WA

What the ground in Longview is like

The USDA soil survey rates mapped ground in Longview for septic drain-field suitability across roughly 15 square miles. About 96% 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 Longview, 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 82% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement82.1%
• Flooding76.7%
• Depth to saturated zone72.5%
• Seepage, bottom layer17.6%

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 · 95.6% Very limited · Slow water movement · 38 map units · 14.81 sq mi · read 2026-08-30