Septic Companies in Wisconsin, by city

294 septic companies in 16 cities. Every city page ranks the businesses in it by rating and review count, with featured placements marked.

Wisconsin homes off the city sewer run on private onsite wastewater treatment systems, the code's name for septic systems, and the work of keeping them running falls to a few hundred local companies. This page lists every Wisconsin city and town in this directory with the septic companies that serve it.

The rules are set by the state Department of Safety and Professional Services and carried out by counties, which issue sanitary permits, keep an inventory of systems and send owners reminders when an inspection or pumping is due. In most of the state that means your county zoning or sanitation office is where your service reports end up, and where a new system starts with a permit.

Most companies here pump tanks and holding tanks; many also inspect systems for the county maintenance program, and a smaller group designs and installs new or replacement systems, including mounds and at-grade systems where the soil will not take a conventional drain field. Soil testing before a new system is done by a certified soil tester.

The biggest city pages are in the places with the most septic companies, from Janesville and Fond du Lac in the south to Green Bay, Wausau, Chippewa Falls and Eau Claire, and up to Rhinelander, Minocqua and Eagle River in the Northwoods. Smaller towns have pages of their own when no larger city is close by.

Pick your city below. Every listing shows what the business offers, its Google rating and how to reach it.

All cities

Smaller towns

These towns have fewer than 3 listed septic companies and are too far from a larger city to share its page.

Frequently asked questions

How many septic companies are listed in Wisconsin?

294 at the last update on 2026-11-15, across 16 cities. Cities with fewer than 3 listed businesses are folded into the nearest city page.

Which Wisconsin city has the most septic companies?

Janesville, with 27 listed. Green Bay is next with 24.

Can I be listed here?

If you run a septic company in Wisconsin and are not listed, use the claim form and we will check the details and add you. Basic listings are free.