| Municipality/District | Municipality/District | Municipality/District |
|---|---|---|
| Village of Adell | Village of Albany | Algoma Sanitary District #1 |
| City of Algoma | Village of Allouez | Village of Alma Center |
| City of Alma | Village of Almena | City of Altoona |
| City of Amery | Village of Amherst | City of Arcadia |
| Village of Arena | Village of Argyle | Village of Arlington |
| Ashippun Sanitary District | Village of Athens | Village of Auburndale |
| City of Augusta | Village of Avoca | Village of Baldwin |
| Village of Balsam Lake | Village of Bangor | Village of Barneveld |
| City of Barron | City of Bayfield | Village of Bear Creek |
| City of Beaver Dam | Village of Belgium | Village of Belleville |
| Village of Belmont | City of Beloit | Town of Beloit |
| City of Berlin | Big Round Lake Protection & Rehabilitation District | Village of Birchwood |
| Village of Biron | Village of Black Creek | Village of Black Earth |
| City of Black River Falls | City of Blair | City of Bloomer |
| Village of Bloomington | Village of Blue Mounds | Village of Blue River |
| Bluffview Sanitary District | Village of Bowler | Village of Boyceville |
| City of Brillion | Village of Bristol | Brockway Sanitary District #1 |
| City of Brodhead | City of Brookfield | Village of Brooklyn |
| Village of Browntown | Village of Bruce | City of Burlington |
| Burnett Sanitary District #1 | Village of Butternut | Village of Caledonia |
| Village of Cambria | Village of Cambridge | Village of Cameron |
| Village of Camp Douglas | Village of Campbellsport | Village of Cascade |
| Village of Casco | Village of Cashton | Village of Cassville |
| Village of Cazenovia | Village of Cedar Grove | Central Brown County Water Authority |
| Village of Chaseburg | City of Chetek | Chili Sanitary District #1 |
| City of Chilton | Clarks Mills Sanitary District | City of Clintonville |
| Village of Cobb | City of Colby | Village of Coleman |
| City of Columbus | Village of Conrath | Consolidated Koshkonong Sanitary Commission |
| City of Cornell | Village of Cottage Grove | City of Crandon |
| Village of Cross Plains | City of Cumberland | Village of Curtiss |
| Dale Sanitary District #1 | Village of Dallas | Village of Dane |
| City of Darlington | Village of De Soto | Village of Deer Park |
| Village of Deerfield | City of Delavan | Village of Denmark |
| Village of Dickeyville | City of Dodgeville | Village of Dorchester |
| Village of Dousman | Town of Dover | Village of Dresser |
| Village of East Troy | Village of Eastman | Village of Eden |
| Village of Edgar | City of Edgerton | Village of Egg Harbor |
| City of Elkhorn | Village of Ellsworth | City of Elroy |
| Village of Ephraim | City of Evansville | Village of Fairwater |
| Village of Fall Creek | Town of Farmington Sanitary District | City of Fennimore |
| Village of Ferryville | Town of Florence | City of Fond du Lac |
| Village of Fontana | Forest Junction Sanitary District | City of Fort Atkinson |
| City of Fountain City | Village of Fox Crossing | Fox West Regional Sewerage Commission |
| City of Franklin | Village of Frederic | Village of Fredonia |
| Freedom Sanitary District #1 | Village of Friesland | City of Galesville |
| Village of Genoa | City of Gillett | Village of Glen Flora |
| City of Glenwood City | Glidden Sanitary District | Village of Grafton |
| Village of Granton | Village of Grantsburg | Village of Gratiot |
| Green Lake Sanitary District | City of Green Lake | Village of Greendale |
| Village of Greenleaf | Village of Greenville | City of Greenwood |
| Village of Gresham | Village of Hales Corners | Village of Hammond |
| Village of Hancock | Hatfield Sanitary District #1 | Village of Haugen |
| Village of Hawkins | City of Hayward | Village of Highland |
| Village of Hilbert | Hillpoint Sanitary District | City of Hillsboro |
| Hingham Sanitary District | Village of Hobart | Ho-Chunk Nation |
| Holland Sanitary District #1 | Village of Holmen | City of Horicon |
| Village of Hortonville | Village of Howards Grove | City of Hudson |
| City of Hurley | City of Independence | Village of Iron Ridge |
| Iron River Sanitary District #1 | Town of Ixonia | Village of Jackson |
| City of Jefferson | Village of Johnson Creek | Village of Junction City |
| City of Juneau | Village of Kellnersville | Kelly Lake Sanitary District #1 |
| Village of Kendall | Village of Kewaskum | Krakow Sanitary District No. 1 |
| Village of Kronenwetter | City of La Crosse | Village of La Farge |
| Village of La Valle | City of Ladysmith | Village of Lake Delton |
| Village of Lake Hallie | Lake Tomahawk Sanitary Dist #1 | Lakeland Sanitary District #1 |
| City of Lancaster | Larsen Winchester Sanitary District | Lebanon Sanitary District #1 |
| Village of Lena | Village of Little Chute | Little Suamico Sanitary District #1 |
| City of Lodi | Village of Loganville | Village of Lomira |
| Village of Lone Rock | Village of Lowell | City of Loyal |
| Village of Luck | Village of Lyndon Station | Village of Lynxville |
| Lyons Sanitary District #2 | Madeline Sanitary District | Village of Maiden Rock |
| Village of Maine | Maple Grove Sanitary District | Village of Marathon City |
| City of Markesan | Village of Marshall | Village of Mattoon |
| City of Mauston | City of Mayville | Village of Mazomanie |
| Village of McFarland | City of Mellen | Village of Melrose |
| City of Menomonie | City of Merrill | Village of Merrillan |
| Village of Merrimac | Village of Milladore | City of Mineral Point |
| Village of Minong | Village of Mishicot | City of Monroe |
| Village of Montfort | Village of Monticello | City of Montreal |
| City of Mosinee | Village of Mount Horeb | Village of Mount Pleasant |
| Village of Mount Sterling | Village of Muscoda | City of Muskego |
| Village of Necedah | Neenah - Menasha Sewerage Commission | City of Neenah |
| City of Nekoosa | Village of Nelson | Village of Neshkoro |
| Village of New Auburn | City of New Berlin | Village of New Glarus |
| City of New Holstein | City of New Lisbon | City of New Richmond |
| Village of Newburg | City of Niagara | Village of North Freedom |
| Village of Norwalk | Norway Sanitary District #1 | City of Oak Creek |
| Village of Oakfield | Town of Oakland Sanitary District #1 | City of Oconto Falls |
| O'Dell's Bay Sanitary District #1 | City of Omro | City of Onalaska |
| Village of Ontario | Village of Oostburg | Village of Orfordville |
| Village of Osceola | City of Osseo | City of Owen |
| Village of Paddock Lake | Village of Palmyra | City of Park Falls |
| Village of Patch Grove | Village of Pepin | City of Peshtigo |
| City of Pewaukee | Phelps Sanitary District #1 | City of Phillips |
| City of Pittsville | Village of Plain | City of Platteville |
| Village of Plover | Village of Plum City | Village of Poplar |
| City of Portage | Portland Sanitary District #1 | Village of Poynette |
| City of Prairie du Chien | Village of Prairie du Sac | City of Princeton |
| Village of Pulaski | Village of Radisson | Village of Randolph |
| Village of Random Lake | Village of Redgranite | City of Reedsburg |
| Village of Reedsville | Village of Reeseville | Village of Rewey |
| City of Rhinelander | Village of Rib Lake | City of Rice Lake |
| City of Richland Center | Richmond Sanitary District #1 | Village of Ridgeway |
| Village of Rio | City of Ripon | City of River Falls |
| Village of Roberts | Village of Rock Springs | Village of Rockdale |
| Rockland Sanitary District #1 | Village of Rockland | Town of Rome |
| Village of Rosendale | Village of Saint Cloud | City of Saint Croix Falls |
| Village of Saint Nazianz | Village of Salem Lakes | Village of Saukville |
| Seneca Sanitary District #1 | City of Seymour | Village of Sharon |
| City of Shawano | City of Sheboygan Falls | Shelby Sanitary District #2 |
| Village of Sheldon | City of Shell Lake | Village of Sherwood |
| City of Shullsburg | Village of Siren | Village of Slinger |
| Village of Soldiers Grove | Village of Somers | Village of Somerset |
| Village of South Wayne | City of Sparta | Village of Spencer |
| Village of Spring Valley | St. Joseph's Sanitary District No. 1 | City of Stanley |
| City of Stevens Point | Village of Stockbridge | Village of Stoddard |
| City of Stoughton - Utilities | Village of Stratford | City of Sturgeon Bay |
| Village of Suring | Village of Sussex | Village of Tennyson |
| Village of Theresa | City of Thorp | Three Lakes Sanitary District #1 |
| Village of Tigerton | City of Tomah | City of Tomahawk |
| Village of Tony | Village of Trempealeau | Village of Turtle Lake |
| Village of Twin Lakes | Village of Union Grove | Village of Waldo |
| Walworth County Metropolitan Sewerage District | City of Washburn | Waterford Sanitary District #1 |
| Village of Waterford | City of Waterloo | City of Waupaca |
| Village of Wausaukee | Village of Wauzeka | Village of Webster |
| City of West Allis | Village of West Baraboo | Village of West Salem |
| Westboro Sanitary District #1 | City of Westby | Western Racine County Sewerage District |
| Village of Weyerhaeuser | Village of Whitefish Bay | City of Whitehall |
| Village of Whitelaw | Village of Whiting | Village of Windsor |
| Village of Winneconne | Village of Winter | City of Wisconsin Dells |
| City of Wisconsin Rapids | Village of Withee | Village of Woodville |
| Village of Wrightstown | Village of Yorkville |