Colorado: drinking water & radon

Colorado has 1,102 active community water systems. Since 2016, 398 reported health-based violations; 2 had a latest lead result above 15 ppb; 15 measured PFOA or PFOS at or above 4 ppt.

Radon zones in Colorado

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

All ZIP codes in Colorado

625 ZIP codes.

80001Arvada80002Arvada80003Arvada80004Arvada80005Arvada80006Arvada80007Arvada80010Aurora80011Aurora80012Aurora80013Aurora80014Aurora80015Aurora80016Aurora80017Aurora80018Aurora80019Aurora80020Broomfield80021Broomfield80022Commerce City80023Broomfield80024Dupont80025Eldorado Springs80026Lafayette80027Louisville80030Westminster80031Westminster80033Wheat Ridge80034Wheat Ridge80035Westminster80036Westminster80037Commerce City80038Broomfield80040Aurora80041Aurora80042Aurora80044Aurora80045Aurora80046Aurora80047Aurora80101Agate80102Bennett80103Byers80104Castle Rock80105Deer Trail80106Elbert80107Elizabeth80108Castle Rock80109Castle Rock80110Englewood80111Englewood80112Englewood80113Englewood80116Franktown80117Kiowa80118Larkspur80120Littleton80121Littleton80122Littleton80123Littleton80124Lone Tree80125Littleton80126Littleton80127Littleton80128Littleton80129Littleton80130Littleton80131Louviers80132Monument80133Palmer Lake80134Parker80135Sedalia80136Strasburg80137Watkins80138Parker80150Englewood80151Englewood80155Englewood80160Littleton80161Littleton80162Littleton80163Littleton80165Littleton80166Littleton80201Denver80202Denver80203Denver80204Denver80205Denver80206Denver80207Denver80208Denver80209Denver80210Denver80211Denver80212Denver80214Denver80215Denver80216Denver80217Denver80218Denver80219Denver80220Denver80221Denver80222Denver80223Denver80224Denver80226Denver80227Denver80228Denver80229Denver80230Denver80231Denver80232Denver80233Denver80234Denver80235Denver80236Denver80237Denver80238Denver80239Denver80241Thornton80243Denver80244Denver80246Denver80247Denver80248Denver80249Denver80250Denver80256Denver80257Denver80259Denver80260Denver80261Denver80262Denver80263Denver80266Denver80271Denver80273Denver80274Denver80281Denver80290Denver80291Denver80299Denver80301Boulder80302Boulder80303Boulder80304Boulder80305Boulder80306Boulder80307Boulder80308Boulder80310Boulder80314Boulder80401Golden80402Golden80403Golden80420Alma80421Bailey80422Black Hawk80423Bond80424Breckenridge80425Buffalo Creek80426Burns80427Central City80428Clark80429Climax80430Coalmont80432Como80433Conifer80434Cowdrey80435Dillon80436Dumont80437Evergreen80438Empire80439Evergreen80440Fairplay80442Fraser80443Frisco80444Georgetown80446Granby80447Grand Lake80448Grant80449Hartsel80451Hot Sulphur Springs80452Idaho Springs80453Idledale80454Indian Hills80455Jamestown80456Jefferson80457Kittredge80459Kremmling80461Leadville80463Mc Coy80465Morrison80466Nederland80467Oak Creek80468Parshall80469Phippsburg80470Pine80471Pinecliffe80473Rand80474Rollinsville80475Shawnee80476Silver Plume80477Steamboat Springs80478Tabernash80479Toponas80480Walden80481Ward80482Winter Park80483Yampa80487Steamboat Springs80488Steamboat Springs80497Silverthorne80498Silverthorne80501Longmont80502Longmont80503Longmont80504Longmont80510Allenspark80511Estes Park80512Bellvue80513Berthoud80514Dacono80515Drake80516Erie80517Estes Park80520Firestone80521Fort Collins80522Fort Collins80524Fort Collins80525Fort Collins80526Fort Collins80527Fort Collins80528Fort Collins80530Frederick80532Glen Haven80533Hygiene80534Johnstown80535Laporte80536Livermore80537Loveland80538Loveland80539Loveland80540Lyons80541Masonville80542Mead80543Milliken80545Red Feather Lakes80546Severance80547Timnath80549Wellington80550Windsor80551Windsor80553Fort Collins80601Brighton80602Brighton80603Brighton80610Ault80611Briggsdale80612Carr80615Eaton80620Evans80621Fort Lupton80622Galeton80623Gilcrest80624Gill80631Greeley80632Greeley80633Greeley80634Greeley80638Greeley80640Henderson80642Hudson80643Keenesburg80644Kersey80645La Salle80648Nunn80649Orchard80650Pierce80651Platteville80652Roggen80653Weldona80654Wiggins80701Fort Morgan80720Akron80721Amherst80722Atwood80723Brush80726Crook80727Eckley80728Fleming80729Grover80731Haxtun80732Hereford80733Hillrose80734Holyoke80735Idalia80736Iliff80737Julesburg80740Lindon80741Merino80742New Raymer80743Otis80744Ovid80745Padroni80746Paoli80747Peetz80749Sedgwick80750Snyder80751Sterling80754Stoneham80755Vernon80757Woodrow80758Wray80759Yuma80801Anton80802Arapahoe80804Arriba80805Bethune80807Burlington80808Calhan80809Cascade80810Cheyenne Wells80812Cope80813Cripple Creek80814Divide80815Flagler80816Florissant80817Fountain80818Genoa80819Green Mountain Falls80820Guffey80821Hugo80822Joes80823Karval80824Kirk80825Kit Carson80826Limon80827Lake George80828Limon80829Manitou Springs80830Matheson80831Peyton80832Ramah80833Rush80834Seibert80835Simla80836Stratton80840Usaf Academy80841Usaf Academy80860Victor80861Vona80862Wild Horse80863Woodland Park80864Yoder80866Woodland Park80901Colorado Springs80902Colorado Springs80903Colorado Springs80904Colorado Springs80905Colorado Springs80906Colorado Springs80907Colorado Springs80908Colorado Springs80909Colorado Springs80910Colorado Springs80911Colorado Springs80913Colorado Springs80914Colorado Springs80915Colorado Springs80916Colorado Springs80917Colorado Springs80918Colorado Springs80919Colorado Springs80920Colorado Springs80921Colorado Springs80922Colorado Springs80923Colorado Springs80924Colorado Springs80925Colorado Springs80926Colorado Springs80927Colorado Springs80928Colorado Springs80929Colorado Springs80930Colorado Springs80931Colorado Springs80932Colorado Springs80933Colorado Springs80934Colorado Springs80935Colorado Springs80936Colorado Springs80937Colorado Springs80938Colorado Springs80939Colorado Springs80941Colorado Springs80942Colorado Springs80946Colorado Springs80947Colorado Springs80949Colorado Springs80950Colorado Springs80951Colorado Springs80960Colorado Springs80962Colorado Springs80970Colorado Springs80977Colorado Springs80995Colorado Springs80997Colorado Springs81001Pueblo81002Pueblo81003Pueblo81004Pueblo81005Pueblo81006Pueblo81007Pueblo81008Pueblo81009Pueblo81010Pueblo81011Pueblo81012Pueblo81019Colorado City81020Aguilar81021Arlington81022Avondale81023Beulah81024Boncarbo81025Boone81027Branson81029Campo81030Cheraw81034Crowley81036Eads81038Fort Lyon81039Fowler81040Gardner81041Granada81043Hartman81044Hasty81045Haswell81046Hoehne81047Holly81049Kim81050La Junta81052Lamar81054Las Animas81055La Veta81057Mc Clave81058Manzanola81059Model81062Olney Springs81063Ordway81064Pritchett81067Rocky Ford81069Rye81071Sheridan Lake81073Springfield81076Sugar City81077Swink81081Trinchera81082Trinidad81084Two Buttes81087Vilas81089Walsenburg81090Walsh81091Weston81092Wiley81101Alamosa81120Antonito81121Arboles81122Bayfield81123Blanca81124Capulin81125Center81126Chama81128Chromo81129Conejos81130Creede81131Crestone81132Del Norte81133Fort Garland81135Homelake81136Hooper81137Ignacio81138Jaroso81140La Jara81141Manassa81143Moffat81144Monte Vista81146Mosca81147Pagosa Springs81148Romeo81149Saguache81151Sanford81152San Luis81154South Fork81155Villa Grove81157Pagosa Springs81201Salida81210Almont81211Buena Vista81212Canon City81215Canon City81220Cimarron81221Coal Creek81222Coaldale81223Cotopaxi81224Crested Butte81225Crested Butte81226Florence81227Monarch81228Granite81230Gunnison81232Hillside81233Howard81235Lake City81236Nathrop81237Ohio City81239Parlin81240Penrose81241Pitkin81242Poncha Springs81243Powderhorn81244Rockvale81248Sargents81251Twin Lakes81252Westcliffe81253Wetmore81290Florence81301Durango81302Durango81303Durango81320Cahone81321Cortez81323Dolores81324Dove Creek81325Egnar81326Hesperus81327Lewis81328Mancos81329Marvel81330Mesa Verde National Park81331Pleasant View81332Rico81334Towaoc81335Yellow Jacket81401Montrose81402Montrose81403Montrose81410Austin81411Bedrock81413Cedaredge81414Cory81415Crawford81416Delta81418Eckert81419Hotchkiss81420Lazear81422Naturita81423Norwood81424Nucla81425Olathe81426Ophir81427Ouray81428Paonia81429Paradox81430Placerville81431Redvale81432Ridgway81433Silverton81434Somerset81435Telluride81501Grand Junction81502Grand Junction81503Grand Junction81504Grand Junction81505Grand Junction81506Grand Junction81507Grand Junction81520Clifton81521Fruita81522Gateway81523Glade Park81524Loma81525Mack81526Palisade81527Whitewater81601Glenwood Springs81602Glenwood Springs81610Dinosaur81611Aspen81612Aspen81615Snowmass Village81620Avon81621Basalt81623Carbondale81624Collbran81625Craig81626Craig81630De Beque81631Eagle81632Edwards81633Dinosaur81635Parachute81636Battlement Mesa81637Gypsum81638Hamilton81639Hayden81640Maybell81641Meeker81642Meredith81643Mesa81645Minturn81646Molina81647New Castle81648Rangely81649Red Cliff81650Rifle81652Silt81653Slater81654Snowmass81655Wolcott81656Woody Creek81657Vail81658Vail

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 Colorado have violations?

398 of 1,102 active community water systems in Colorado reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in Colorado?

571 ZIP codes are in EPA radon zone 1 (highest potential), 54 in zone 2 and 0 in zone 3. EPA recommends testing every home.