Septic companies in Pasco, WA

What the ground in Pasco is like

The USDA soil survey rates mapped ground in Pasco for septic drain-field suitability across roughly 39 square miles. About 88% 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 Pasco, 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 88% of the rated ground here.

The limiting features the survey records most often here:

• Filtering capacity88.1%
• Slow water movement6.2%
• Slope4.2%

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 · 88.4% Very limited · Filtering capacity · 34 map units · 38.96 sq mi · read 2026-08-30