Septic companies in Sequim, WA

What the ground in Sequim is like

The USDA soil survey rates mapped ground in Sequim for septic drain-field suitability across roughly 6.3 square miles. About 100% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Sequim, the leading limit is seepage in the bottom layer: water moves through the soil too quickly. That is the opposite of a slow-drainage problem. The risk is untreated effluent reaching groundwater before the soil can clean it, not backup at the surface. The survey flags that limit on about 57% of the rated ground here.

The limiting features the survey records most often here:

• Seepage, bottom layer57.1%
• Filtering capacity57.1%
• Large stones54.6%
• Depth to saturated zone42.9%

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 · Seepage, bottom layer · 12 map units · 6.32 sq mi · read 2026-08-30