Septic companies in Oconomowoc, WI

What the ground in Oconomowoc is like

The USDA soil survey rates mapped ground in Oconomowoc for septic drain-field suitability across roughly 12 square miles. About 96% 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 Oconomowoc, 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 85% of the rated ground here.

The limiting features the survey records most often here:

• Seepage, bottom layer85.3%
• Slow water movement77.6%
• Depth to saturated zone27.8%
• Ponding18.5%

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 · 95.5% Very limited · Seepage, bottom layer · 74 map units · 11.82 sq mi · read 2026-08-30