Connecticut: drinking water & radon

Connecticut has 504 active community water systems. Since 2016, 193 reported health-based violations; 5 had a latest lead result above 15 ppb; 37 measured PFOA or PFOS at or above 4 ppt.

Radon zones in Connecticut

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

All ZIP codes in Connecticut

418 ZIP codes.

06001Avon06002Bloomfield06006Windsor06010Bristol06011Bristol06013Burlington06016Broad Brook06018Canaan06019Canton06020Canton Center06021Colebrook06022Collinsville06023East Berlin06024East Canaan06025East Glastonbury06026East Granby06027East Hartland06028East Windsor Hill06029Ellington06030Farmington06031Falls Village06032Farmington06033Glastonbury06034Farmington06035Granby06037Berlin06039Lakeville06040Manchester06041Manchester06042Manchester06043Bolton06045Manchester06050New Britain06051New Britain06052New Britain06053New Britain06057New Hartford06058Norfolk06059North Canton06060North Granby06061Pine Meadow06062Plainville06063Barkhamsted06064Poquonock06065Riverton06066Vernon Rockville06067Rocky Hill06068Salisbury06069Sharon06070Simsbury06071Somers06072Somersville06073South Glastonbury06074South Windsor06075Stafford06076Stafford Springs06077Staffordville06078Suffield06079Taconic06080Suffield06081Tariffville06082Enfield06083Enfield06084Tolland06085Unionville06088East Windsor06089Weatogue06090West Granby06091West Hartland06092West Simsbury06093West Suffield06094Winchester Center06095Windsor06096Windsor Locks06098Winsted06101Hartford06102Hartford06103Hartford06104Hartford06105Hartford06106Hartford06107West Hartford06108East Hartford06109Wethersfield06110West Hartford06111Newington06112Hartford06114Hartford06115Hartford06117West Hartford06118East Hartford06119West Hartford06120Hartford06123Hartford06126Hartford06127West Hartford06128East Hartford06129Wethersfield06131Newington06132Hartford06133West Hartford06134Hartford06137West Hartford06138East Hartford06140Hartford06141Hartford06142Hartford06143Hartford06144Hartford06145Hartford06146Hartford06147Hartford06150Hartford06151Hartford06152Hartford06153Hartford06154Hartford06155Hartford06156Hartford06160Hartford06161Hartford06167Hartford06176Hartford06180Hartford06183Hartford06199Hartford06226Willimantic06231Amston06232Andover06233Ballouville06234Brooklyn06235Chaplin06237Columbia06238Coventry06239Danielson06241Dayville06242Eastford06243East Killingly06244East Woodstock06245Fabyan06246Grosvenor Dale06247Hampton06248Hebron06249Lebanon06250Mansfield Center06251Mansfield Depot06254North Franklin06255North Grosvenordale06256North Windham06259Pomfret Center06260Putnam06262Quinebaug06263Rogers06264Scotland06265South Willington06266South Windham06267South Woodstock06268Storrs Mansfield06269Storrs Mansfield06277Thompson06278Ashford06279Willington06280Windham06281Woodstock06282Woodstock Valley06320New London06330Baltic06331Canterbury06332Central Village06333East Lyme06334Bozrah06335Gales Ferry06336Gilman06338Mashantucket06339Ledyard06340Groton06350Hanover06351Jewett City06354Moosup06355Mystic06357Niantic06359North Stonington06360Norwich06365Preston06370Oakdale06371Old Lyme06372Old Mystic06373Oneco06374Plainfield06375Quaker Hill06376South Lyme06377Sterling06378Stonington06379Pawcatuck06380Taftville06382Uncasville06383Versailles06384Voluntown06385Waterford06387Wauregan06388West Mystic06389Yantic06401Ansonia06403Beacon Falls06404Botsford06405Branford06408Cheshire06409Centerbrook06410Cheshire06411Cheshire06412Chester06413Clinton06414Cobalt06415Colchester06416Cromwell06417Deep River06418Derby06419Killingworth06420Salem06422Durham06423East Haddam06424East Hampton06426Essex06437Guilford06438Haddam06439Hadlyme06440Hawleyville06441Higganum06442Ivoryton06443Madison06444Marion06447Marlborough06450Meriden06451Meriden06455Middlefield06456Middle Haddam06457Middletown06459Middletown06460Milford06461Milford06467Milldale06468Monroe06469Moodus06470Newtown06471North Branford06472Northford06473North Haven06474North Westchester06475Old Saybrook06477Orange06478Oxford06479Plantsville06480Portland06481Rockfall06482Sandy Hook06483Seymour06484Shelton06487South Britain06488Southbury06489Southington06491Stevenson06492Wallingford06493Wallingford06494Wallingford06495Wallingford06498Westbrook06501New Haven06502New Haven06503New Haven06504New Haven06505New Haven06506New Haven06507New Haven06508New Haven06509New Haven06510New Haven06511New Haven06512New Haven06513New Haven06514Hamden06515New Haven06516West Haven06517Hamden06518Hamden06519New Haven06520New Haven06521New Haven06524Bethany06525New Haven06530New Haven06531New Haven06532New Haven06533New Haven06534New Haven06535New Haven06536New Haven06537New Haven06538New Haven06540New Haven06601Bridgeport06602Bridgeport06604Bridgeport06605Bridgeport06606Bridgeport06607Bridgeport06608Bridgeport06610Bridgeport06611Trumbull06612Easton06614Stratford06615Stratford06673Bridgeport06699Bridgeport06701Waterbury06702Waterbury06703Waterbury06704Waterbury06705Waterbury06706Waterbury06708Waterbury06710Waterbury06712Prospect06716Wolcott06720Waterbury06721Waterbury06722Waterbury06723Waterbury06724Waterbury06725Waterbury06726Waterbury06749Waterbury06750Bantam06751Bethlehem06752Bridgewater06753Cornwall06754Cornwall Bridge06755Gaylordsville06756Goshen06757Kent06758Lakeside06759Litchfield06762Middlebury06763Morris06770Naugatuck06776New Milford06777New Preston Marble Dale06778Northfield06779Oakville06781Pequabuck06782Plymouth06783Roxbury06784Sherman06785South Kent06786Terryville06787Thomaston06790Torrington06791Harwinton06792Torrington06793Washington06794Washington Depot06795Watertown06796West Cornwall06798Woodbury06801Bethel06804Brookfield06807Cos Cob06810Danbury06811Danbury06812New Fairfield06813Danbury06820Darien06824Fairfield06825Fairfield06828Fairfield06829Georgetown06830Greenwich06831Greenwich06836Greenwich06838Greens Farms06840New Canaan06850Norwalk06851Norwalk06852Norwalk06853Norwalk06854Norwalk06855Norwalk06856Norwalk06857Norwalk06858Norwalk06860Norwalk06870Old Greenwich06875Redding Center06876Redding Ridge06877Ridgefield06878Riverside06879Ridgefield06880Westport06881Westport06883Weston06888Westport06889Westport06890Southport06896Redding06897Wilton06901Stamford06902Stamford06903Stamford06904Stamford06905Stamford06906Stamford06907Stamford06910Stamford06911Stamford06912Stamford06913Stamford06914Stamford06926Stamford06927Stamford

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 Connecticut have violations?

193 of 504 active community water systems in Connecticut reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in Connecticut?

143 ZIP codes are in EPA radon zone 1 (highest potential), 84 in zone 2 and 60 in zone 3. EPA recommends testing every home.