Septic companies in Kirkland, WA

What the ground in Kirkland is like

The USDA soil survey rates mapped ground in Kirkland for septic drain-field suitability across roughly 18 square miles. About 100% 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 Kirkland, the leading limit is slope: the ground falls steeply enough that a level trench line is hard to hold. A drain field has to sit across the grade without concentrating flow downhill; on steeper parcels that layout gets tighter. The survey flags that limit on about 79% of the rated ground here.

The limiting features the survey records most often here:

• Slope79.3%
• Depth to saturated zone78.6%
• Seepage, bottom layer22.3%
• Slow water movement13.1%

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 · Slope · 27 map units · 17.81 sq mi · read 2026-08-30