Septic companies in Moses Lake, WA

What the ground in Moses Lake is like

The USDA soil survey rates mapped ground in Moses Lake for septic drain-field suitability across roughly 18 square miles. About 74% of the rated ground is classed "Not limited", the survey records few restrictions for a conventional drain field across most of that ground.

In Moses Lake, the leading limit is filtering capacity: the soil does not clean effluent thoroughly enough on its way through. A drain field is a treatment system as well as a disposal path; when the ground cannot filter well, pathogens and nutrients travel farther than the survey allows. The survey flags that limit on about 10% of the rated ground here.

The limiting features the survey records most often here:

• Filtering capacity9.9%
• Slope9.7%
• Slow water movement7.9%
• Depth to cemented pan7.6%

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 · 73.5% Not limited · Filtering capacity · 50 map units · 18.14 sq mi · read 2026-08-30