| Subject | Counties Served |
| Large Private Onsite Wastewater Treatment Systems (POWTS) | Adams, Brown, Buffalo, Calumet, Clark, Door, Fond Du Lac, Green Lake, Jackson, Juneau, Kewaunee, Manitowoc, Marathon, Marquette, Outagamie, Portage, Trempealeau, Waupaca, Waushara, Winnebago, Wood |
| Municipal Wastewater Plan Review | Adams, Brown, Buffalo, Calumet, Clark, Door, Fond Du Lac, Green Lake, Jackson, Juneau, Kewaunee, Manitowoc, Marathon, Marquette, Outagamie, Portage, Trempealeau, Waupaca, Waushara, Winnebago, Wood |
| Sanitary Sewer Collection Systems | Statewide |
| Sewer Extension Plan Review | Statewide |
| Wastewater Treatment Plants | Adams, Brown, Buffalo, Calumet, Clark, Door, Fond Du Lac, Green Lake, Jackson, Juneau, Kewaunee, Manitowoc, Marathon, Marquette, Outagamie, Portage, Trempealeau, Waupaca, Waushara, Winnebago, Wood |