Wisconsin: drinking water & radon

Wisconsin has 978 active community water systems. Since 2016, 375 reported health-based violations; 6 had a latest lead result above 15 ppb; 20 measured PFOA or PFOS at or above 4 ppt.

Radon zones in Wisconsin

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

All ZIP codes in Wisconsin

872 ZIP codes.

53001Adell53002Allenton53003Ashippun53004Belgium53005Brookfield53006Brownsville53007Butler53008Brookfield53010Campbellsport53011Cascade53012Cedarburg53013Cedar Grove53014Chilton53015Cleveland53016Clyman53017Colgate53018Delafield53019Eden53020Elkhart Lake53021Fredonia53022Germantown53023Glenbeulah53024Grafton53026Greenbush53027Hartford53029Hartland53031Hingham53032Horicon53033Hubertus53034Hustisford53035Iron Ridge53036Ixonia53037Jackson53038Johnson Creek53039Juneau53040Kewaskum53042Kiel53044Kohler53045Brookfield53046Lannon53047Lebanon53048Lomira53049Malone53050Mayville53051Menomonee Falls53052Menomonee Falls53056Merton53057Mount Calvary53058Nashotah53059Neosho53060Newburg53061New Holstein53062New Holstein53063Newton53064North Lake53065Oakfield53066Oconomowoc53069Okauchee53070Oostburg53072Pewaukee53073Plymouth53074Port Washington53075Random Lake53076Richfield53078Rubicon53079Saint Cloud53080Saukville53081Sheboygan53082Sheboygan53083Sheboygan53085Sheboygan Falls53086Slinger53088Stockbridge53089Sussex53090West Bend53091Theresa53092Mequon53093Waldo53094Watertown53095West Bend53097Mequon53098Watertown53099Woodland53101Bassett53102Benet Lake53103Big Bend53104Bristol53105Burlington53108Caledonia53109Camp Lake53110Cudahy53114Darien53115Delavan53118Dousman53119Eagle53120East Troy53121Elkhorn53122Elm Grove53125Fontana53126Franksville53127Genesee Depot53128Genoa City53129Greendale53130Hales Corners53132Franklin53137Helenville53138Honey Creek53139Kansasville53140Kenosha53141Kenosha53142Kenosha53143Kenosha53144Kenosha53146New Berlin53147Lake Geneva53148Lyons53149Mukwonago53150Muskego53151New Berlin53152New Munster53153North Prairie53154Oak Creek53156Palmyra53157Pell Lake53158Pleasant Prairie53159Powers Lake53167Rochester53168Salem53170Silver Lake53171Somers53172South Milwaukee53176Springfield53177Sturtevant53178Sullivan53179Trevor53181Twin Lakes53182Union Grove53183Wales53184Walworth53185Waterford53186Waukesha53187Waukesha53188Waukesha53189Waukesha53190Whitewater53191Williams Bay53192Wilmot53194Woodworth53195Zenda53201Milwaukee53202Milwaukee53203Milwaukee53204Milwaukee53205Milwaukee53206Milwaukee53207Milwaukee53208Milwaukee53209Milwaukee53210Milwaukee53211Milwaukee53212Milwaukee53213Milwaukee53214Milwaukee53215Milwaukee53216Milwaukee53217Milwaukee53218Milwaukee53219Milwaukee53220Milwaukee53221Milwaukee53222Milwaukee53223Milwaukee53224Milwaukee53225Milwaukee53226Milwaukee53227Milwaukee53228Milwaukee53233Milwaukee53234Milwaukee53235Saint Francis53237Milwaukee53259Milwaukee53263Milwaukee53274Milwaukee53278Milwaukee53288Milwaukee53290Milwaukee53293Milwaukee53295Milwaukee53401Racine53402Racine53403Racine53404Racine53405Racine53406Racine53407Racine53408Racine53502Albany53503Arena53504Argyle53505Avalon53506Avoca53507Barneveld53508Belleville53510Belmont53511Beloit53512Beloit53515Black Earth53516Blanchardville53517Blue Mounds53518Blue River53520Brodhead53521Brooklyn53522Browntown53523Cambridge53525Clinton53526Cobb53527Cottage Grove53528Cross Plains53529Dane53530Darlington53531Deerfield53532Deforest53533Dodgeville53534Edgerton53535Edmund53536Evansville53537Footville53538Fort Atkinson53541Gratiot53542Hanover53543Highland53544Hollandale53545Janesville53546Janesville53547Janesville53548Janesville53549Jefferson53550Juda53551Lake Mills53553Linden53554Livingston53555Lodi53556Lone Rock53557Lowell53558Mc Farland53559Marshall53560Mazomanie53561Merrimac53562Middleton53563Milton53565Mineral Point53566Monroe53569Montfort53570Monticello53571Morrisonville53572Mount Horeb53573Muscoda53574New Glarus53575Oregon53576Orfordville53577Plain53578Prairie Du Sac53579Reeseville53580Rewey53581Richland Center53582Ridgeway53583Sauk City53584Sextonville53585Sharon53586Shullsburg53587South Wayne53588Spring Green53589Stoughton53590Sun Prairie53593Verona53594Waterloo53595Dodgeville53596Sun Prairie53597Waunakee53598Windsor53599Woodford53701Madison53702Madison53703Madison53704Madison53705Madison53706Madison53707Madison53708Madison53711Madison53713Madison53714Madison53715Madison53716Madison53717Madison53718Madison53719Madison53725Madison53726Madison53744Madison53774Madison53777Madison53782Madison53783Madison53784Madison53785Madison53786Madison53788Madison53790Madison53791Madison53792Madison53793Madison53794Madison53801Bagley53802Beetown53803Benton53804Bloomington53805Boscobel53806Cassville53807Cuba City53808Dickeyville53809Fennimore53810Glen Haven53811Hazel Green53812Kieler53813Lancaster53816Mount Hope53817Patch Grove53818Platteville53820Potosi53821Prairie Du Chien53824Sinsinawa53825Stitzer53826Wauzeka53827Woodman53901Portage53910Adams53911Arlington53913Baraboo53916Beaver Dam53919Brandon53920Briggsville53922Burnett53923Cambria53924Cazenovia53925Columbus53926Dalton53928Doylestown53929Elroy53930Endeavor53931Fairwater53932Fall River53933Fox Lake53934Friendship53935Friesland53936Grand Marsh53937Hillpoint53939Kingston53940Lake Delton53941La Valle53942Lime Ridge53943Loganville53944Lyndon Station53946Markesan53948Mauston53949Montello53950New Lisbon53951North Freedom53952Oxford53953Packwaukee53954Pardeeville53955Poynette53956Randolph53957Randolph53958Reedsburg53959Reedsburg53960Rio53961Rock Springs53962Union Center53963Waupun53964Westfield53965Wisconsin Dells53968Wonewoc53969Wyocena54001Amery54002Baldwin54003Beldenville54004Clayton54005Clear Lake54006Cushing54007Deer Park54009Dresser54011Ellsworth54013Glenwood City54014Hager City54015Hammond54016Hudson54017New Richmond54020Osceola54021Prescott54022River Falls54023Roberts54024Saint Croix Falls54025Somerset54026Star Prairie54027Wilson54028Woodville54082Houlton54101Abrams54102Amberg54103Armstrong Creek54104Athelstane54106Black Creek54107Bonduel54110Brillion54111Cecil54112Coleman54113Combined Locks54114Crivitz54115De Pere54119Dunbar54120Fence54121Florence54123Forest Junction54124Gillett54125Goodman54126Greenleaf54128Gresham54129Hilbert54130Kaukauna54131Freedom54135Keshena54136Kimberly54137Krakow54138Lakewood54139Lena54140Little Chute54141Little Suamico54143Marinette54149Mountain54150Neopit54151Niagara54152Nichols54153Oconto54154Oconto Falls54155Oneida54156Pembine54157Peshtigo54159Porterfield54161Pound54162Pulaski54165Seymour54166Shawano54169Sherwood54170Shiocton54171Sobieski54173Suamico54174Suring54175Townsend54177Wausaukee54180Wrightstown54201Algoma54202Baileys Harbor54204Brussels54205Casco54207Collins54208Denmark54209Egg Harbor54210Ellison Bay54211Ephraim54212Fish Creek54213Forestville54214Francis Creek54215Kellnersville54216Kewaunee54217Luxemburg54220Manitowoc54221Manitowoc54226Maplewood54227Maribel54228Mishicot54229New Franken54230Reedsville54232Saint Nazianz54234Sister Bay54235Sturgeon Bay54240Tisch Mills54241Two Rivers54245Valders54246Washington Island54247Whitelaw54301Green Bay54302Green Bay54303Green Bay54304Green Bay54305Green Bay54306Green Bay54307Green Bay54308Green Bay54311Green Bay54313Green Bay54324Green Bay54344Green Bay54401Wausau54402Wausau54403Wausau54404Marshfield54405Abbotsford54406Amherst54407Amherst Junction54408Aniwa54409Antigo54410Arpin54411Athens54412Auburndale54413Babcock54414Birnamwood54415Blenker54416Bowler54417Brokaw54418Bryant54420Chili54421Colby54422Curtiss54423Custer54424Deerbrook54425Dorchester54426Edgar54427Eland54428Elcho54429Elderon54430Elton54433Gilman54435Gleason54436Granton54437Greenwood54440Hatley54441Hewitt54442Irma54443Junction City54446Loyal54447Lublin54448Marathon54449Marshfield54450Mattoon54451Medford54452Merrill54454Milladore54455Mosinee54456Neillsville54457Nekoosa54458Nelsonville54459Ogema54460Owen54462Pearson54463Pelican Lake54464Phlox54465Pickerel54466Pittsville54467Plover54469Port Edwards54470Rib Lake54471Ringle54473Rosholt54474Rothschild54475Rudolph54476Schofield54479Spencer54480Stetsonville54481Stevens Point54482Stevens Point54484Stratford54485Summit Lake54486Tigerton54487Tomahawk54488Unity54489Vesper54490Westboro54491White Lake54492Stevens Point54493Willard54494Wisconsin Rapids54495Wisconsin Rapids54498Withee54499Wittenberg54501Rhinelander54511Argonne54512Boulder Junction54513Brantwood54514Butternut54515Catawba54517Clam Lake54519Conover54520Crandon54521Eagle River54524Fifield54525Gile54526Glen Flora54527Glidden54529Harshaw54530Hawkins54531Hazelhurst54532Heafford Junction54534Hurley54536Iron Belt54537Kennan54538Lac Du Flambeau54539Lake Tomahawk54540Land O Lakes54541Laona54542Long Lake54543Mc Naughton54545Manitowish Waters54546Mellen54547Mercer54548Minocqua54550Montreal54552Park Falls54554Phelps54555Phillips54556Prentice54557Presque Isle54558Saint Germain54559Saxon54560Sayner54561Star Lake54562Three Lakes54563Tony54564Tripoli54565Upson54566Wabeno54568Woodruff54601La Crosse54602La Crosse54603La Crosse54610Alma54611Alma Center54612Arcadia54613Arkdale54614Bangor54615Black River Falls54616Blair54618Camp Douglas54619Cashton54620Cataract54621Chaseburg54622Cochrane54623Coon Valley54624De Soto54625Dodge54626Eastman54627Ettrick54628Ferryville54629Fountain City54630Galesville54631Gays Mills54632Genoa54634Hillsboro54635Hixton54636Holmen54637Hustler54638Kendall54639La Farge54642Melrose54643Millston54644Mindoro54645Mount Sterling54646Necedah54648Norwalk54649Oakdale54650Onalaska54651Ontario54652Readstown54653Rockland54654Seneca54655Soldiers Grove54656Sparta54657Steuben54658Stoddard54659Taylor54660Tomah54661Trempealeau54662Tunnel City54664Viola54665Viroqua54666Warrens54667Westby54669West Salem54670Wilton54701Eau Claire54702Eau Claire54703Eau Claire54720Altoona54721Arkansaw54722Augusta54723Bay City54724Bloomer54725Boyceville54726Boyd54727Cadott54728Chetek54729Chippewa Falls54730Colfax54731Conrath54732Cornell54733Dallas54734Downing54735Downsville54736Durand54737Eau Galle54738Eleva54739Elk Mound54740Elmwood54741Fairchild54742Fall Creek54743Gilmanton54745Holcombe54746Humbird54747Independence54748Jim Falls54749Knapp54750Maiden Rock54751Menomonie54754Merrillan54755Mondovi54756Nelson54757New Auburn54758Osseo54759Pepin54760Pigeon Falls54761Plum City54762Prairie Farm54763Ridgeland54764Rock Falls54766Sheldon54767Spring Valley54768Stanley54769Stockholm54770Strum54771Thorp54772Wheeler54773Whitehall54774Chippewa Falls54801Spooner54805Almena54806Ashland54810Balsam Lake54812Barron54813Barronett54814Bayfield54816Benoit54817Birchwood54819Bruce54820Brule54821Cable54822Cameron54824Centuria54826Comstock54827Cornucopia54828Couderay54829Cumberland54830Danbury54832Drummond54835Exeland54836Foxboro54837Frederic54838Gordon54839Grand View54840Grantsburg54841Haugen54842Hawthorne54843Hayward54844Herbster54845Hertel54846High Bridge54847Iron River54848Ladysmith54849Lake Nebagamon54850La Pointe54853Luck54854Maple54855Marengo54856Mason54857Mikana54858Milltown54859Minong54861Odanah54862Ojibwa54864Poplar54865Port Wing54867Radisson54868Rice Lake54870Sarona54871Shell Lake54872Siren54873Solon Springs54874South Range54875Springbrook54876Stone Lake54880Superior54888Trego54889Turtle Lake54890Wascott54891Washburn54893Webster54895Weyerhaeuser54896Winter54901Oshkosh54902Oshkosh54903Oshkosh54904Oshkosh54906Oshkosh54909Almond54911Appleton54912Appleton54913Appleton54914Appleton54915Appleton54919Appleton54921Bancroft54922Bear Creek54923Berlin54926Big Falls54927Butte Des Morts54928Caroline54929Clintonville54930Coloma54931Dale54932Eldorado54933Embarrass54935Fond Du Lac54936Fond Du Lac54937Fond Du Lac54940Fremont54941Green Lake54942Greenville54943Hancock54944Hortonville54945Iola54946King54947Larsen54948Leopolis54949Manawa54950Marion54952Menasha54956Neenah54957Neenah54960Neshkoro54961New London54962Ogdensburg54963Omro54964Pickett54965Pine River54966Plainfield54967Poy Sippi54968Princeton54969Readfield54970Redgranite54971Ripon54974Rosendale54976Saxeville54977Scandinavia54978Tilleda54979Van Dyne54980Waukau54981Waupaca54982Wautoma54983Weyauwega54984Wild Rose54985Winnebago54986Winneconne

What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.

Questions

How many water systems in Wisconsin have violations?

375 of 978 active community water systems in Wisconsin reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in Wisconsin?

379 ZIP codes are in EPA radon zone 1 (highest potential), 493 in zone 2 and 0 in zone 3. EPA recommends testing every home.