Septic companies in Kennewick, WA

What the ground in Kennewick is like

The USDA soil survey rates mapped ground in Kennewick for septic drain-field suitability across roughly 29 square miles. About 53% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Kennewick, 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 55% of the rated ground here.

The limiting features the survey records most often here:

• Slow water movement55.5%
• Slope26.0%
• Filtering capacity11.9%
• Depth to saturated zone3.6%

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 · 53.4% Very limited · Slow water movement · 64 map units · 28.57 sq mi · read 2026-08-30