Septic companies in Rochester, WA

What the ground in Rochester is like

The USDA soil survey rates mapped ground in Rochester for septic drain-field suitability across roughly 8.5 square miles. About 99% of the rated ground is classed "Very limited", the survey records severe restrictions for a conventional drain field across most of that ground.

In Rochester, 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 89% of the rated ground here.

The limiting features the survey records most often here:

• Seepage, bottom layer89.1%
• Filtering capacity74.0%
• Slope15.7%
• Slow water movement11.3%

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 · 99.2% Very limited · Seepage, bottom layer · 25 map units · 8.46 sq mi · read 2026-08-30