California: drinking water & radon

California has 3,064 active community water systems. Since 2016, 1017 reported health-based violations; 31 had a latest lead result above 15 ppb; 165 measured PFOA or PFOS at or above 4 ppt.

Radon zones in California

tap a county

Zone 1 · highestZone 2 · moderateZone 3 · low

All ZIP codes in California

2,554 ZIP codes.

90001Los Angeles90002Los Angeles90003Los Angeles90004Los Angeles90005Los Angeles90006Los Angeles90007Los Angeles90008Los Angeles90009Los Angeles90010Los Angeles90011Los Angeles90012Los Angeles90013Los Angeles90014Los Angeles90015Los Angeles90016Los Angeles90017Los Angeles90018Los Angeles90019Los Angeles90020Los Angeles90021Los Angeles90022Los Angeles90023Los Angeles90024Los Angeles90025Los Angeles90026Los Angeles90027Los Angeles90028Los Angeles90029Los Angeles90030Los Angeles90031Los Angeles90032Los Angeles90033Los Angeles90034Los Angeles90035Los Angeles90036Los Angeles90037Los Angeles90038Los Angeles90039Los Angeles90040Los Angeles90041Los Angeles90042Los Angeles90043Los Angeles90044Los Angeles90045Los Angeles90046Los Angeles90047Los Angeles90048Los Angeles90049Los Angeles90050Los Angeles90051Los Angeles90052Los Angeles90053Los Angeles90054Los Angeles90055Los Angeles90056Los Angeles90057Los Angeles90058Los Angeles90059Los Angeles90060Los Angeles90061Los Angeles90062Los Angeles90063Los Angeles90064Los Angeles90065Los Angeles90066Los Angeles90067Los Angeles90068Los Angeles90069West Hollywood90070Los Angeles90072Los Angeles90073Los Angeles90074Los Angeles90075Los Angeles90076Los Angeles90077Los Angeles90078Los Angeles90079Los Angeles90080Los Angeles90081Los Angeles90082Los Angeles90083Los Angeles90084Los Angeles90086Los Angeles90087Los Angeles90088Los Angeles90090Dodgertown90091Los Angeles90093Los Angeles90094Playa Vista90095Los Angeles90096Los Angeles90099Los Angeles90134Los Angeles90189Los Angeles90201Bell Gardens90202Bell90209Beverly Hills90210Beverly Hills90211Beverly Hills90212Beverly Hills90213Beverly Hills90220Compton90221Compton90222Compton90223Compton90224Compton90230Culver City90231Culver City90232Culver City90233Culver City90239Downey90240Downey90241Downey90242Downey90245El Segundo90247Gardena90248Gardena90249Gardena90250Hawthorne90251Hawthorne90254Hermosa Beach90255Huntington Park90260Lawndale90261Lawndale90262Lynwood90264Malibu90265Malibu90266Manhattan Beach90267Manhattan Beach90270Maywood90272Pacific Palisades90274Palos Verdes Peninsula90275Rancho Palos Verdes90277Redondo Beach90278Redondo Beach90280South Gate90290Topanga90291Venice90292Marina Del Rey90293Playa Del Rey90294Venice90295Marina Del Rey90296Playa Del Rey90301Inglewood90302Inglewood90303Inglewood90304Inglewood90305Inglewood90306Inglewood90307Inglewood90308Inglewood90309Inglewood90310Inglewood90311Inglewood90312Inglewood90401Santa Monica90402Santa Monica90403Santa Monica90404Santa Monica90405Santa Monica90406Santa Monica90407Santa Monica90408Santa Monica90409Santa Monica90410Santa Monica90411Santa Monica90501Torrance90502Torrance90503Torrance90504Torrance90505Torrance90507Torrance90508Torrance90509Torrance90510Torrance90601Whittier90602Whittier90603Whittier90604Whittier90605Whittier90606Whittier90607Whittier90608Whittier90609Whittier90610Whittier90620Buena Park90621Buena Park90622Buena Park90623La Palma90624Buena Park90630Cypress90631La Habra90632La Habra90633La Habra90637La Mirada90638La Mirada90640Montebello90650Norwalk90651Norwalk90652Norwalk90660Pico Rivera90661Pico Rivera90662Pico Rivera90670Santa Fe Springs90671Santa Fe Springs90680Stanton90701Artesia90702Artesia90703Cerritos90704Avalon90706Bellflower90707Bellflower90710Harbor City90711Lakewood90712Lakewood90713Lakewood90714Lakewood90715Lakewood90716Hawaiian Gardens90717Lomita90720Los Alamitos90721Los Alamitos90723Paramount90731San Pedro90732San Pedro90733San Pedro90734San Pedro90740Seal Beach90742Sunset Beach90743Surfside90744Wilmington90745Carson90746Carson90748Wilmington90749Carson90755Signal Hill90801Long Beach90802Long Beach90803Long Beach90804Long Beach90805Long Beach90806Long Beach90807Long Beach90808Long Beach90809Long Beach90810Long Beach90813Long Beach90814Long Beach90815Long Beach90831Long Beach90832Long Beach90833Long Beach90842Long Beach90844Long Beach90846Long Beach90847Long Beach90848Long Beach90853Long Beach90895Carson91001Altadena91003Altadena91006Arcadia91007Arcadia91008Duarte91009Duarte91010Duarte91011La Canada Flintridge91012La Canada Flintridge91016Monrovia91017Monrovia91020Montrose91021Montrose91023Mount Wilson91024Sierra Madre91025Sierra Madre91030South Pasadena91031South Pasadena91040Sunland91041Sunland91042Tujunga91043Tujunga91046Verdugo City91066Arcadia91077Arcadia91101Pasadena91102Pasadena91103Pasadena91104Pasadena91105Pasadena91106Pasadena91107Pasadena91108San Marino91109Pasadena91110Pasadena91114Pasadena91115Pasadena91116Pasadena91117Pasadena91118San Marino91121Pasadena91124Pasadena91125Pasadena91126Pasadena91129Pasadena91182Pasadena91184Pasadena91185Pasadena91188Pasadena91189Pasadena91199Pasadena91201Glendale91202Glendale91203Glendale91204Glendale91205Glendale91206Glendale91207Glendale91208Glendale91209Glendale91214La Crescenta91221Glendale91222Glendale91224La Crescenta91225Glendale91226Glendale91301Agoura Hills91302Calabasas91303Canoga Park91304Canoga Park91305Canoga Park91306Winnetka91307West Hills91308West Hills91309Canoga Park91310Castaic91311Chatsworth91313Chatsworth91316Encino91319Newbury Park91320Newbury Park91321Newhall91322Newhall91324Northridge91325Northridge91326Porter Ranch91327Northridge91328Northridge91329Northridge91330Northridge91331Pacoima91333Pacoima91334Pacoima91335Reseda91337Reseda91340San Fernando91341San Fernando91342Sylmar91343North Hills91344Granada Hills91345Mission Hills91346Mission Hills91350Santa Clarita91351Canyon Country91352Sun Valley91353Sun Valley91354Valencia91355Valencia91356Tarzana91357Tarzana91358Thousand Oaks91359Westlake Village91360Thousand Oaks91361Westlake Village91362Thousand Oaks91364Woodland Hills91365Woodland Hills91367Woodland Hills91371Woodland Hills91372Calabasas91376Agoura Hills91377Oak Park91380Santa Clarita91381Stevenson Ranch91382Santa Clarita91383Santa Clarita91384Castaic91385Valencia91386Canyon Country91387Canyon Country91390Santa Clarita91392Sylmar91393North Hills91394Granada Hills91395Mission Hills91396Winnetka91401Van Nuys91402Panorama City91403Sherman Oaks91404Van Nuys91405Van Nuys91406Van Nuys91407Van Nuys91408Van Nuys91409Van Nuys91410Van Nuys91411Van Nuys91412Panorama City91413Sherman Oaks91416Encino91423Sherman Oaks91426Encino91436Encino91470Van Nuys91482Van Nuys91495Sherman Oaks91496Van Nuys91499Van Nuys91501Burbank91502Burbank91503Burbank91504Burbank91505Burbank91506Burbank91507Burbank91508Burbank91510Burbank91526Burbank91601North Hollywood91602North Hollywood91603North Hollywood91604Studio City91605North Hollywood91606North Hollywood91607Valley Village91608Universal City91609North Hollywood91610Toluca Lake91611North Hollywood91612North Hollywood91614Studio City91615North Hollywood91616North Hollywood91617Valley Village91618North Hollywood91701Rancho Cucamonga91702Azusa91706Baldwin Park91708Chino91709Chino Hills91710Chino91711Claremont91714City Of Industry91715City Of Industry91716City Of Industry91722Covina91723Covina91724Covina91729Rancho Cucamonga91730Rancho Cucamonga91731El Monte91732El Monte91733South El Monte91734El Monte91735El Monte91737Rancho Cucamonga91739Rancho Cucamonga91740Glendora91741Glendora91743Guasti91744La Puente91745Hacienda Heights91746La Puente91747La Puente91748Rowland Heights91749La Puente91750La Verne91752Mira Loma91754Monterey Park91755Monterey Park91756Monterey Park91758Ontario91759Mount Baldy91761Ontario91762Ontario91763Montclair91764Ontario91765Diamond Bar91766Pomona91767Pomona91768Pomona91769Pomona91770Rosemead91771Rosemead91772Rosemead91773San Dimas91775San Gabriel91776San Gabriel91778San Gabriel91780Temple City91784Upland91785Upland91786Upland91788Walnut91789Walnut91790West Covina91791West Covina91792West Covina91793West Covina91801Alhambra91802Alhambra91803Alhambra91804Alhambra91896Alhambra91899Alhambra91901Alpine91902Bonita91903Alpine91905Boulevard91906Campo91908Bonita91909Chula Vista91910Chula Vista91911Chula Vista91912Chula Vista91913Chula Vista91914Chula Vista91915Chula Vista91916Descanso91917Dulzura91921Chula Vista91931Guatay91932Imperial Beach91933Imperial Beach91934Jacumba91935Jamul91941La Mesa91942La Mesa91943La Mesa91944La Mesa91945Lemon Grove91946Lemon Grove91948Mount Laguna91950National City91951National City91962Pine Valley91963Potrero91976Spring Valley91977Spring Valley91978Spring Valley91979Spring Valley91980Tecate91987Tecate92003Bonsall92004Borrego Springs92007Cardiff By The Sea92008Carlsbad92009Carlsbad92010Carlsbad92011Carlsbad92013Carlsbad92014Del Mar92018Carlsbad92019El Cajon92020El Cajon92021El Cajon92022El Cajon92023Encinitas92024Encinitas92025Escondido92026Escondido92027Escondido92028Fallbrook92029Escondido92030Escondido92033Escondido92036Julian92037La Jolla92038La Jolla92039La Jolla92040Lakeside92046Escondido92049Oceanside92051Oceanside92052Oceanside92054Oceanside92055Camp Pendleton92056Oceanside92057Oceanside92058Oceanside92059Pala92060Palomar Mountain92061Pauma Valley92064Poway92065Ramona92066Ranchita92067Rancho Santa Fe92068San Luis Rey92069San Marcos92070Santa Ysabel92071Santee92072Santee92074Poway92075Solana Beach92078San Marcos92079San Marcos92081Vista92082Valley Center92083Vista92084Vista92085Vista92086Warner Springs92088Fallbrook92091Rancho Santa Fe92092La Jolla92093La Jolla92096San Marcos92101San Diego92102San Diego92103San Diego92104San Diego92105San Diego92106San Diego92107San Diego92108San Diego92109San Diego92110San Diego92111San Diego92112San Diego92113San Diego92114San Diego92115San Diego92116San Diego92117San Diego92118Coronado92119San Diego92120San Diego92121San Diego92122San Diego92123San Diego92124San Diego92126San Diego92127San Diego92128San Diego92129San Diego92130San Diego92131San Diego92132San Diego92135San Diego92136San Diego92137San Diego92138San Diego92139San Diego92140San Diego92142San Diego92143San Ysidro92145San Diego92147San Diego92149San Diego92150San Diego92153San Diego92154San Diego92155San Diego92158San Diego92159San Diego92160San Diego92161San Diego92163San Diego92165San Diego92166San Diego92167San Diego92168San Diego92169San Diego92170San Diego92171San Diego92172San Diego92173San Ysidro92174San Diego92175San Diego92176San Diego92177San Diego92178Coronado92179San Diego92182San Diego92186San Diego92187San Diego92191San Diego92192San Diego92193San Diego92195San Diego92196San Diego92197San Diego92198San Diego92199San Diego92201Indio92202Indio92203Indio92210Indian Wells92211Palm Desert92220Banning92222Bard92223Beaumont92225Blythe92226Blythe92227Brawley92230Cabazon92231Calexico92232Calexico92233Calipatria92234Cathedral City92235Cathedral City92236Coachella92239Desert Center92240Desert Hot Springs92241Desert Hot Springs92242Earp92243El Centro92244El Centro92247La Quinta92248La Quinta92249Heber92250Holtville92251Imperial92252Joshua Tree92253La Quinta92254Mecca92255Palm Desert92256Morongo Valley92257Niland92258North Palm Springs92259Ocotillo92260Palm Desert92261Palm Desert92262Palm Springs92263Palm Springs92264Palm Springs92266Palo Verde92267Parker Dam92268Pioneertown92270Rancho Mirage92273Seeley92274Thermal92275Salton City92276Thousand Palms92277Twentynine Palms92278Twentynine Palms92280Vidal92281Westmorland92282Whitewater92283Winterhaven92284Yucca Valley92285Landers92286Yucca Valley92301Adelanto92304Amboy92305Angelus Oaks92307Apple Valley92308Apple Valley92309Baker92310Fort Irwin92311Barstow92312Barstow92313Grand Terrace92314Big Bear City92315Big Bear Lake92316Bloomington92317Blue Jay92320Calimesa92321Cedar Glen92322Cedarpines Park92323Cima92324Colton92325Crestline92327Daggett92328Death Valley92329Phelan92331Fontana92332Essex92333Fawnskin92334Fontana92335Fontana92336Fontana92337Fontana92338Ludlow92339Forest Falls92340Hesperia92341Green Valley Lake92342Helendale92344Hesperia92345Hesperia92346Highland92347Hinkley92352Lake Arrowhead92354Loma Linda92356Lucerne Valley92357Loma Linda92358Lytle Creek92359Mentone92363Needles92364Nipton92365Newberry Springs92366Mountain Pass92368Oro Grande92369Patton92371Phelan92372Pinon Hills92373Redlands92374Redlands92375Redlands92376Rialto92377Rialto92378Rimforest92382Running Springs92384Shoshone92385Skyforest92386Sugarloaf92389Tecopa92391Twin Peaks92392Victorville92393Victorville92394Victorville92395Victorville92397Wrightwood92398Yermo92399Yucaipa92401San Bernardino92402San Bernardino92403San Bernardino92404San Bernardino92405San Bernardino92406San Bernardino92407San Bernardino92408San Bernardino92410San Bernardino92411San Bernardino92413San Bernardino92418San Bernardino92423San Bernardino92427San Bernardino92501Riverside92502Riverside92503Riverside92504Riverside92505Riverside92506Riverside92507Riverside92508Riverside92509Riverside92513Riverside92514Riverside92516Riverside92517Riverside92518March Air Reserve Base92519Riverside92521Riverside92522Riverside92530Lake Elsinore92531Lake Elsinore92532Lake Elsinore92536Aguanga92539Anza92543Hemet92544Hemet92545Hemet92546Hemet92548Homeland92549Idyllwild92551Moreno Valley92552Moreno Valley92553Moreno Valley92554Moreno Valley92555Moreno Valley92556Moreno Valley92557Moreno Valley92561Mountain Center92562Murrieta92563Murrieta92564Murrieta92567Nuevo92570Perris92571Perris92572Perris92581San Jacinto92582San Jacinto92583San Jacinto92584Menifee92585Sun City92586Sun City92587Quail Valley92589Temecula92590Temecula92591Temecula92592Temecula92593Temecula92595Wildomar92596Winchester92599Perris92602Irvine92603Irvine92604Irvine92605Huntington Beach92606Irvine92607Laguna Niguel92609El Toro92610Foothill Ranch92612Irvine92614Irvine92615Huntington Beach92616Irvine92617Irvine92618Irvine92619Irvine92620Irvine92623Irvine92624Capistrano Beach92625Corona Del Mar92626Costa Mesa92627Costa Mesa92628Costa Mesa92629Dana Point92630Lake Forest92637Laguna Woods92646Huntington Beach92647Huntington Beach92648Huntington Beach92649Huntington Beach92650East Irvine92651Laguna Beach92652Laguna Beach92653Laguna Hills92654Laguna Hills92655Midway City92656Aliso Viejo92657Newport Coast92658Newport Beach92659Newport Beach92660Newport Beach92661Newport Beach92662Newport Beach92663Newport Beach92672San Clemente92673San Clemente92674San Clemente92675San Juan Capistrano92676Silverado92677Laguna Niguel92678Trabuco Canyon92679Trabuco Canyon92683Westminster92684Westminster92685Westminster92688Rancho Santa Margarita92690Mission Viejo92691Mission Viejo92692Mission Viejo92693San Juan Capistrano92694Ladera Ranch92697Irvine92698Aliso Viejo92701Santa Ana92702Santa Ana92703Santa Ana92704Santa Ana92705Santa Ana92706Santa Ana92707Santa Ana92708Fountain Valley92711Santa Ana92712Santa Ana92728Fountain Valley92735Santa Ana92780Tustin92781Tustin92782Tustin92799Santa Ana92801Anaheim92802Anaheim92803Anaheim92804Anaheim92805Anaheim92806Anaheim92807Anaheim92808Anaheim92809Anaheim92811Atwood92812Anaheim92814Anaheim92815Anaheim92816Anaheim92817Anaheim92821Brea92822Brea92823Brea92825Anaheim92831Fullerton92832Fullerton92833Fullerton92834Fullerton92835Fullerton92836Fullerton92837Fullerton92838Fullerton92840Garden Grove92841Garden Grove92842Garden Grove92843Garden Grove92844Garden Grove92845Garden Grove92846Garden Grove92850Anaheim92856Orange92857Orange92859Orange92860Norco92861Villa Park92862Orange92863Orange92864Orange92865Orange92866Orange92867Orange92868Orange92869Orange92870Placentia92871Placentia92877Corona92879Corona92880Corona92881Corona92882Corona92883Corona92885Yorba Linda92886Yorba Linda92887Yorba Linda92899Anaheim93001Ventura93002Ventura93003Ventura93004Ventura93005Ventura93006Ventura93007Ventura93009Ventura93010Camarillo93011Camarillo93012Camarillo93013Carpinteria93014Carpinteria93015Fillmore93016Fillmore93020Moorpark93021Moorpark93022Oak View93023Ojai93024Ojai93030Oxnard93031Oxnard93032Oxnard93033Oxnard93034Oxnard93035Oxnard93036Oxnard93040Piru93041Port Hueneme93042Point Mugu Nawc93043Port Hueneme Cbc Base93044Port Hueneme93060Santa Paula93061Santa Paula93062Simi Valley93063Simi Valley93064Brandeis93065Simi Valley93066Somis93067Summerland93094Simi Valley93099Simi Valley93101Santa Barbara93102Santa Barbara93103Santa Barbara93105Santa Barbara93106Santa Barbara93107Santa Barbara93108Santa Barbara93109Santa Barbara93110Santa Barbara93111Santa Barbara93116Goleta93117Goleta93118Goleta93120Santa Barbara93121Santa Barbara93130Santa Barbara93140Santa Barbara93150Santa Barbara93160Santa Barbara93190Santa Barbara93199Goleta93201Alpaugh93202Armona93203Arvin93204Avenal93205Bodfish93206Buttonwillow93207California Hot Springs93208Camp Nelson93210Coalinga93212Corcoran93215Delano93216Delano93218Ducor93219Earlimart93220Edison93221Exeter93222Pine Mountain Club93223Farmersville93224Fellows93225Frazier Park93226Glennville93227Goshen93230Hanford93232Hanford93234Huron93235Ivanhoe93237Kaweah93238Kernville93239Kettleman City93240Lake Isabella93241Lamont93242Laton93243Lebec93244Lemon Cove93245Lemoore93246Lemoore93247Lindsay93249Lost Hills93250Mc Farland93251Mc Kittrick93252Maricopa93254New Cuyama93255Onyx93256Pixley93257Porterville93258Porterville93260Posey93261Richgrove93262Sequoia National Park93263Shafter93265Springville93266Stratford93267Strathmore93268Taft93270Terra Bella93271Three Rivers93272Tipton93274Tulare93275Tulare93276Tupman93277Visalia93278Visalia93279Visalia93280Wasco93282Waukena93283Weldon93285Wofford Heights93286Woodlake93287Woody93290Visalia93291Visalia93292Visalia93301Bakersfield93302Bakersfield93303Bakersfield93304Bakersfield93305Bakersfield93306Bakersfield93307Bakersfield93308Bakersfield93309Bakersfield93311Bakersfield93312Bakersfield93313Bakersfield93314Bakersfield93380Bakersfield93383Bakersfield93384Bakersfield93385Bakersfield93386Bakersfield93387Bakersfield93388Bakersfield93389Bakersfield93390Bakersfield93401San Luis Obispo93402Los Osos93403San Luis Obispo93405San Luis Obispo93406San Luis Obispo93407San Luis Obispo93408San Luis Obispo93409San Luis Obispo93410San Luis Obispo93412Los Osos93420Arroyo Grande93422Atascadero93423Atascadero93424Avila Beach93426Bradley93427Buellton93428Cambria93429Casmalia93430Cayucos93432Creston93433Grover Beach93434Guadalupe93436Lompoc93437Lompoc93438Lompoc93440Los Alamos93441Los Olivos93442Morro Bay93443Morro Bay93444Nipomo93445Oceano93446Paso Robles93447Paso Robles93448Pismo Beach93449Pismo Beach93450San Ardo93451San Miguel93452San Simeon93453Santa Margarita93454Santa Maria93455Santa Maria93456Santa Maria93457Santa Maria93458Santa Maria93460Santa Ynez93461Shandon93463Solvang93464Solvang93465Templeton93475Oceano93483Grover Beach93501Mojave93502Mojave93504California City93505California City93510Acton93512Benton93513Big Pine93514Bishop93515Bishop93516Boron93517Bridgeport93518Caliente93519Cantil93522Darwin93523Edwards93524Edwards93526Independence93527Inyokern93528Johannesburg93529June Lake93530Keeler93531Keene93532Lake Hughes93534Lancaster93535Lancaster93536Lancaster93539Lancaster93541Lee Vining93542Little Lake93543Littlerock93544Llano93545Lone Pine93546Mammoth Lakes93549Olancha93550Palmdale93551Palmdale93552Palmdale93553Pearblossom93554Randsburg93555Ridgecrest93556Ridgecrest93558Red Mountain93560Rosamond93561Tehachapi93562Trona93563Valyermo93581Tehachapi93584Lancaster93586Lancaster93590Palmdale93591Palmdale93592Trona93596Boron93599Palmdale93601Ahwahnee93602Auberry93603Badger93604Bass Lake93605Big Creek93606Biola93607Burrel93608Cantua Creek93609Caruthers93610Chowchilla93611Clovis93612Clovis93613Clovis93614Coarsegold93615Cutler93616Del Rey93618Dinuba93619Clovis93620Dos Palos93621Dunlap93622Firebaugh93623Fish Camp93624Five Points93625Fowler93626Friant93627Helm93628Hume93630Kerman93631Kingsburg93633Kings Canyon National Pk93634Lakeshore93635Los Banos93636Madera93637Madera93638Madera93639Madera93640Mendota93641Miramonte93642Mono Hot Springs93643North Fork93644Oakhurst93645O Neals93646Orange Cove93647Orosi93648Parlier93649Piedra93650Fresno93651Prather93652Raisin City93653Raymond93654Reedley93656Riverdale93657Sanger93660San Joaquin93661Santa Rita Park93662Selma93664Shaver Lake93665South Dos Palos93666Sultana93667Tollhouse93668Tranquillity93669Wishon93670Yettem93673Traver93675Yokuts93701Fresno93702Fresno93703Fresno93704Fresno93705Fresno93706Fresno93707Fresno93708Fresno93709Fresno93710Fresno93711Fresno93712Fresno93714Fresno93715Fresno93716Fresno93717Fresno93718Fresno93720Fresno93721Fresno93722Fresno93723Fresno93724Fresno93725Fresno93726Fresno93727Fresno93728Fresno93729Fresno93730Fresno93737Fresno93740Fresno93744Fresno93745Fresno93747Fresno93750Fresno93755Fresno93760Fresno93761Fresno93764Fresno93765Fresno93771Fresno93772Fresno93773Fresno93774Fresno93775Fresno93776Fresno93777Fresno93778Fresno93779Fresno93786Fresno93790Fresno93791Fresno93792Fresno93793Fresno93794Fresno93844Fresno93888Fresno93901Salinas93902Salinas93905Salinas93906Salinas93907Salinas93908Salinas93912Salinas93915Salinas93920Big Sur93921Carmel By The Sea93922Carmel93923Carmel93924Carmel Valley93925Chualar93926Gonzales93927Greenfield93928Jolon93930King City93932Lockwood93933Marina93940Monterey93942Monterey93944Monterey93950Pacific Grove93953Pebble Beach93954San Lucas93955Seaside93960Soledad93962Spreckels94002Belmont94005Brisbane94010Burlingame94011Burlingame94014Daly City94015Daly City94016Daly City94017Daly City94018El Granada94019Half Moon Bay94020La Honda94021Loma Mar94022Los Altos94023Los Altos94024Los Altos94025Menlo Park94026Menlo Park94027Atherton94028Portola Valley94030Millbrae94037Montara94038Moss Beach94039Mountain View94040Mountain View94041Mountain View94042Mountain View94043Mountain View94044Pacifica94060Pescadero94061Redwood City94062Redwood City94063Redwood City94064Redwood City94065Redwood City94066San Bruno94070San Carlos94074San Gregorio94080South San Francisco94083South San Francisco94085Sunnyvale94086Sunnyvale94087Sunnyvale94088Sunnyvale94089Sunnyvale94102San Francisco94103San Francisco94104San Francisco94105San Francisco94107San Francisco94108San Francisco94109San Francisco94110San Francisco94111San Francisco94112San Francisco94114San Francisco94115San Francisco94116San Francisco94117San Francisco94118San Francisco94119San Francisco94120San Francisco94121San Francisco94122San Francisco94123San Francisco94124San Francisco94125San Francisco94126San Francisco94127San Francisco94128San Francisco94129San Francisco94130San Francisco94131San Francisco94132San Francisco94133San Francisco94134San Francisco94137San Francisco94139San Francisco94140San Francisco94141San Francisco94142San Francisco94144San Francisco94145San Francisco94146San Francisco94147San Francisco94151San Francisco94158San Francisco94159San Francisco94160San Francisco94161San Francisco94163San Francisco94164San Francisco94172San Francisco94177San Francisco94188San Francisco94203Sacramento94204Sacramento94205Sacramento94206Sacramento94207Sacramento94208Sacramento94209Sacramento94211Sacramento94229Sacramento94230Sacramento94232Sacramento94234Sacramento94235Sacramento94236Sacramento94237Sacramento94239Sacramento94240Sacramento94244Sacramento94245Sacramento94247Sacramento94248Sacramento94249Sacramento94250Sacramento94252Sacramento94254Sacramento94256Sacramento94257Sacramento94258Sacramento94259Sacramento94261Sacramento94262Sacramento94263Sacramento94267Sacramento94268Sacramento94269Sacramento94271Sacramento94273Sacramento94274Sacramento94277Sacramento94278Sacramento94279Sacramento94280Sacramento94282Sacramento94283Sacramento94284Sacramento94285Sacramento94287Sacramento94288Sacramento94289Sacramento94290Sacramento94291Sacramento94293Sacramento94294Sacramento94295Sacramento94296Sacramento94297Sacramento94298Sacramento94299Sacramento94301Palo Alto94302Palo Alto94303Palo Alto94304Palo Alto94305Stanford94306Palo Alto94309Palo Alto94401San Mateo94402San Mateo94403San Mateo94404San Mateo94497San Mateo94501Alameda94502Alameda94503American Canyon94505Discovery Bay94506Danville94507Alamo94508Angwin94509Antioch94510Benicia94511Bethel Island94512Birds Landing94513Brentwood94514Byron94515Calistoga94516Canyon94517Clayton94518Concord94519Concord94520Concord94521Concord94522Concord94523Pleasant Hill94524Concord94525Crockett94526Danville94527Concord94528Diablo94529Concord94530El Cerrito94531Antioch94533Fairfield94534Fairfield94535Travis Afb94536Fremont94537Fremont94538Fremont94539Fremont94540Hayward94541Hayward94542Hayward94543Hayward94544Hayward94545Hayward94546Castro Valley94547Hercules94548Knightsen94549Lafayette94550Livermore94551Livermore94552Castro Valley94553Martinez94555Fremont94556Moraga94557Hayward94558Napa94559Napa94560Newark94561Oakley94562Oakville94563Orinda94564Pinole94565Pittsburg94566Pleasanton94567Pope Valley94568Dublin94569Port Costa94570Moraga94571Rio Vista94572Rodeo94573Rutherford94574Saint Helena94575Moraga94576Deer Park94577San Leandro94578San Leandro94579San Leandro94580San Lorenzo94581Napa94582San Ramon94583San Ramon94585Suisun City94586Sunol94587Union City94588Pleasanton94589Vallejo94590Vallejo94591Vallejo94592Vallejo94595Walnut Creek94596Walnut Creek94597Walnut Creek94598Walnut Creek94599Yountville94601Oakland94602Oakland94603Oakland94604Oakland94605Oakland94606Oakland94607Oakland94608Emeryville94609Oakland94610Oakland94611Oakland94612Oakland94613Oakland94614Oakland94615Oakland94617Oakland94618Oakland94619Oakland94620Piedmont94621Oakland94622Oakland94623Oakland94624Oakland94649Oakland94659Oakland94660Oakland94661Oakland94662Emeryville94666Oakland94701Berkeley94702Berkeley94703Berkeley94704Berkeley94705Berkeley94706Albany94707Berkeley94708Berkeley94709Berkeley94710Berkeley94712Berkeley94720Berkeley94801Richmond94802Richmond94803El Sobrante94804Richmond94805Richmond94806San Pablo94807Richmond94808Richmond94820El Sobrante94850Richmond94901San Rafael94903San Rafael94904Greenbrae94912San Rafael94913San Rafael94914Kentfield94915San Rafael94920Belvedere Tiburon94922Bodega94923Bodega Bay94924Bolinas94925Corte Madera94926Rohnert Park94927Rohnert Park94928Rohnert Park94929Dillon Beach94930Fairfax94931Cotati94933Forest Knolls94937Inverness94938Lagunitas94939Larkspur94940Marshall94941Mill Valley94942Mill Valley94945Novato94946Nicasio94947Novato94948Novato94949Novato94950Olema94951Penngrove94952Petaluma94953Petaluma94954Petaluma94955Petaluma94956Point Reyes Station94957Ross94960San Anselmo94963San Geronimo94964San Quentin94965Sausalito94966Sausalito94970Stinson Beach94971Tomales94972Valley Ford94973Woodacre94974San Quentin94975Petaluma94976Corte Madera94977Larkspur94978Fairfax94979San Anselmo94998Novato94999Petaluma95001Aptos95002Alviso95003Aptos95004Aromas95005Ben Lomond95006Boulder Creek95007Brookdale95008Campbell95009Campbell95010Capitola95011Campbell95012Castroville95013Coyote95014Cupertino95015Cupertino95017Davenport95018Felton95019Freedom95020Gilroy95021Gilroy95023Hollister95024Hollister95026Holy City95030Los Gatos95031Los Gatos95032Los Gatos95033Los Gatos95035Milpitas95036Milpitas95037Morgan Hill95038Morgan Hill95039Moss Landing95041Mount Hermon95042New Almaden95043Paicines95044Redwood Estates95045San Juan Bautista95046San Martin95050Santa Clara95051Santa Clara95052Santa Clara95053Santa Clara95054Santa Clara95055Santa Clara95056Santa Clara95060Santa Cruz95061Santa Cruz95062Santa Cruz95063Santa Cruz95064Santa Cruz95065Santa Cruz95066Scotts Valley95067Scotts Valley95070Saratoga95071Saratoga95073Soquel95075Tres Pinos95076Watsonville95077Watsonville95101San Jose95103San Jose95106San Jose95108San Jose95109San Jose95110San Jose95111San Jose95112San Jose95113San Jose95115San Jose95116San Jose95117San Jose95118San Jose95119San Jose95120San Jose95121San Jose95122San Jose95123San Jose95124San Jose95125San Jose95126San Jose95127San Jose95128San Jose95129San Jose95130San Jose95131San Jose95132San Jose95133San Jose95134San Jose95135San Jose95136San Jose95138San Jose95139San Jose95140Mount Hamilton95148San Jose95150San Jose95151San Jose95152San Jose95153San Jose95154San Jose95155San Jose95156San Jose95157San Jose95158San Jose95159San Jose95160San Jose95161San Jose95164San Jose95170San Jose95172San Jose95173San Jose95190San Jose95191San Jose95193San Jose95194San Jose95196San Jose95201Stockton95202Stockton95203Stockton95204Stockton95205Stockton95206Stockton95207Stockton95208Stockton95209Stockton95210Stockton95212Stockton95213Stockton95214Stockton95215Stockton95219Stockton95220Acampo95221Altaville95222Angels Camp95223Arnold95224Avery95225Burson95226Campo Seco95227Clements95228Copperopolis95229Douglas Flat95230Farmington95231French Camp95232Glencoe95233Hathaway Pines95234Holt95236Linden95237Lockeford95240Lodi95241Lodi95242Lodi95245Mokelumne Hill95246Mountain Ranch95247Murphys95248Rail Road Flat95249San Andreas95251Vallecito95252Valley Springs95253Victor95254Wallace95255West Point95257Wilseyville95258Woodbridge95267Stockton95269Stockton95296Stockton95297Stockton95301Atwater95303Ballico95304Tracy95305Big Oak Flat95306Catheys Valley95307Ceres95309Chinese Camp95310Columbia95311Coulterville95312Cressey95313Crows Landing95315Delhi95316Denair95317El Nido95318El Portal95319Empire95320Escalon95321Groveland95322Gustine95323Hickman95324Hilmar95325Hornitos95326Hughson95327Jamestown95328Keyes95329La Grange95330Lathrop95333Le Grand95334Livingston95335Long Barn95336Manteca95337Manteca95338Mariposa95340Merced95341Merced95343Merced95344Merced95345Midpines95346Mi Wuk Village95347Moccasin95348Merced95350Modesto95351Modesto95352Modesto95353Modesto95354Modesto95355Modesto95356Modesto95357Modesto95358Modesto95360Newman95361Oakdale95363Patterson95364Pinecrest95365Planada95366Ripon95367Riverbank95368Salida95369Snelling95370Sonora95372Soulsbyville95373Standard95374Stevinson95375Strawberry95376Tracy95377Tracy95378Tracy95379Tuolumne95380Turlock95381Turlock95382Turlock95383Twain Harte95385Vernalis95386Waterford95387Westley95388Winton95389Yosemite National Park95391Tracy95397Modesto95401Santa Rosa95402Santa Rosa95403Santa Rosa95404Santa Rosa95405Santa Rosa95406Santa Rosa95407Santa Rosa95409Santa Rosa95410Albion95412Annapolis95415Boonville95416Boyes Hot Springs95417Branscomb95418Calpella95419Camp Meeker95420Caspar95421Cazadero95422Clearlake95423Clearlake Oaks95424Clearlake Park95425Cloverdale95426Cobb95427Comptche95428Covelo95429Dos Rios95430Duncans Mills95431Eldridge95432Elk95433El Verano95435Finley95436Forestville95437Fort Bragg95439Fulton95441Geyserville95442Glen Ellen95443Glenhaven95444Graton95445Gualala95446Guerneville95448Healdsburg95449Hopland95450Jenner95451Kelseyville95452Kenwood95453Lakeport95454Laytonville95456Little River95457Lower Lake95458Lucerne95459Manchester95460Mendocino95461Middletown95462Monte Rio95463Navarro95464Nice95465Occidental95466Philo95467Hidden Valley Lake95468Point Arena95469Potter Valley95470Redwood Valley95471Rio Nido95472Sebastopol95473Sebastopol95476Sonoma95480Stewarts Point95481Talmage95482Ukiah95485Upper Lake95486Villa Grande95487Vineburg95488Westport95490Willits95492Windsor95493Witter Springs95494Yorkville95497The Sea Ranch95501Eureka95502Eureka95503Eureka95511Alderpoint95514Blocksburg95518Arcata95519Mckinleyville95521Arcata95524Bayside95525Blue Lake95526Bridgeville95527Burnt Ranch95528Carlotta95531Crescent City95532Crescent City95534Cutten95536Ferndale95537Fields Landing95538Fort Dick95540Fortuna95542Garberville95543Gasquet95545Honeydew95546Hoopa95547Hydesville95548Klamath95549Kneeland95550Korbel95551Loleta95552Mad River95553Miranda95554Myers Flat95555Orick95556Orleans95558Petrolia95559Phillipsville95560Redway95562Rio Dell95563Salyer95564Samoa95565Scotia95567Smith River95568Somes Bar95569Redcrest95570Trinidad95571Weott95573Willow Creek95585Leggett95587Piercy95589Whitethorn95595Zenia95601Amador City95602Auburn95603Auburn95604Auburn95605West Sacramento95606Brooks95607Capay95608Carmichael95609Carmichael95610Citrus Heights95611Citrus Heights95612Clarksburg95613Coloma95614Cool95615Courtland95616Davis95617Davis95618Davis95619Diamond Springs95620Dixon95621Citrus Heights95623El Dorado95624Elk Grove95625Elmira95626Elverta95627Esparto95628Fair Oaks95629Fiddletown95630Folsom95631Foresthill95632Galt95633Garden Valley95634Georgetown95635Greenwood95636Grizzly Flats95637Guinda95638Herald95639Hood95640Ione95641Isleton95642Jackson95644Kit Carson95645Knights Landing95646Kirkwood95648Lincoln95650Loomis95651Lotus95652Mcclellan95653Madison95654Martell95655Mather95656Mount Aukum95658Newcastle95659Nicolaus95660North Highlands95661Roseville95662Orangevale95663Penryn95664Pilot Hill95665Pine Grove95666Pioneer95667Placerville95668Pleasant Grove95669Plymouth95670Rancho Cordova95671Represa95672Rescue95673Rio Linda95674Rio Oso95675River Pines95676Robbins95677Rocklin95678Roseville95679Rumsey95680Ryde95681Sheridan95682Shingle Springs95683Sloughhouse95684Somerset95685Sutter Creek95686Thornton95687Vacaville95688Vacaville95689Volcano95690Walnut Grove95691West Sacramento95692Wheatland95693Wilton95694Winters95695Woodland95696Vacaville95697Yolo95698Zamora95699Drytown95701Alta95703Applegate95709Camino95712Chicago Park95713Colfax95714Dutch Flat95715Emigrant Gap95717Gold Run95720Kyburz95721Echo Lake95722Meadow Vista95726Pollock Pines95728Soda Springs95735Twin Bridges95736Weimar95741Rancho Cordova95742Rancho Cordova95746Granite Bay95747Roseville95757Elk Grove95758Elk Grove95759Elk Grove95762El Dorado Hills95763Folsom95765Rocklin95776Woodland95798West Sacramento95799West Sacramento95811Sacramento95812Sacramento95813Sacramento95814Sacramento95815Sacramento95816Sacramento95817Sacramento95818Sacramento95819Sacramento95820Sacramento95821Sacramento95822Sacramento95823Sacramento95824Sacramento95825Sacramento95826Sacramento95827Sacramento95828Sacramento95829Sacramento95830Sacramento95831Sacramento95832Sacramento95833Sacramento95834Sacramento95835Sacramento95837Sacramento95838Sacramento95840Sacramento95841Sacramento95842Sacramento95843Antelope95851Sacramento95852Sacramento95853Sacramento95860Sacramento95864Sacramento95865Sacramento95866Sacramento95867Sacramento95894Sacramento95899Sacramento95901Marysville95903Beale Afb95910Alleghany95912Arbuckle95913Artois95914Bangor95915Belden95916Berry Creek95917Biggs95918Browns Valley95919Brownsville95920Butte City95922Camptonville95923Canyon Dam95924Cedar Ridge95925Challenge95926Chico95927Chico95928Chico95929Chico95930Clipper Mills95932Colusa95934Crescent Mills95935Dobbins95936Downieville95937Dunnigan95938Durham95939Elk Creek95940Feather Falls95941Forbestown95942Forest Ranch95943Glenn95944Goodyears Bar95945Grass Valley95946Penn Valley95947Greenville95948Gridley95949Grass Valley95950Grimes95951Hamilton City95953Live Oak95954Magalia95955Maxwell95956Meadow Valley95957Meridian95958Nelson95959Nevada City95960North San Juan95961Olivehurst95962Oregon House95963Orland95965Oroville95966Oroville95967Paradise95968Palermo95969Paradise95970Princeton95971Quincy95972Rackerby95973Chico95974Richvale95975Rough And Ready95976Chico95977Smartsville95978Stirling City95979Stonyford95980Storrie95981Strawberry Valley95982Sutter95983Taylorsville95984Twain95986Washington95987Williams95988Willows95991Yuba City95992Yuba City95993Yuba City96001Redding96002Redding96003Redding96006Adin96007Anderson96008Bella Vista96009Bieber96010Big Bar96011Big Bend96013Burney96014Callahan96015Canby96016Cassel96017Castella96019Shasta Lake96020Chester96021Corning96022Cottonwood96023Dorris96024Douglas City96025Dunsmuir96027Etna96028Fall River Mills96029Flournoy96031Forks Of Salmon96032Fort Jones96033French Gulch96034Gazelle96035Gerber96037Greenview96038Grenada96039Happy Camp96040Hat Creek96041Hayfork96044Hornbrook96046Hyampom96047Igo96048Junction City96049Redding96050Klamath River96051Lakehead96052Lewiston96054Lookout96055Los Molinos96056Mcarthur96057Mccloud96058Macdoel96059Manton96061Mill Creek96062Millville96063Mineral96064Montague96065Montgomery Creek96067Mount Shasta96068Nubieber96069Oak Run96070Obrien96071Old Station96073Palo Cedro96074Paskenta96075Paynes Creek96076Platina96078Proberta96079Shasta Lake96080Red Bluff96084Round Mountain96085Scott Bar96086Seiad Valley96087Shasta96088Shingletown96090Tehama96091Trinity Center96092Vina96093Weaverville96094Weed96095Whiskeytown96096Whitmore96097Yreka96099Redding96101Alturas96103Blairsden Graeagle96104Cedarville96105Chilcoot96106Clio96107Coleville96108Davis Creek96109Doyle96110Eagleville96111Floriston96112Fort Bidwell96113Herlong96114Janesville96115Lake City96116Likely96117Litchfield96118Loyalton96119Madeline96120Markleeville96121Milford96122Portola96123Ravendale96124Calpine96125Sierra City96126Sierraville96127Susanville96128Standish96129Beckwourth96130Susanville96132Termo96133Topaz96134Tulelake96135Vinton96136Wendel96137Westwood96140Carnelian Bay96141Homewood96142Tahoma96143Kings Beach96145Tahoe City96146Olympic Valley96148Tahoe Vista96150South Lake Tahoe96151South Lake Tahoe96152South Lake Tahoe96154South Lake Tahoe96155South Lake Tahoe96156South Lake Tahoe96157South Lake Tahoe96158South Lake Tahoe96160Truckee96161Truckee

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 California have violations?

1017 of 3,064 active community water systems in California reported at least one health-based violation since 2016 (EPA SDWIS).

What is the radon risk in California?

90 ZIP codes are in EPA radon zone 1 (highest potential), 1,491 in zone 2 and 952 in zone 3. EPA recommends testing every home.