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Map of Radon Zones in California based on Environmental Protection Agency (EPA) data

Back to Radon Zones in the United States




Radon zones
 Zone 3 (28 counties)
 Zone 2 (33 counties)
 Zone 1 (7 counties)
  Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones)
  Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
  Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)
Alameda County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94501Alameda352
94502Alameda140
94536Fremont483
94538Fremont501
94539Fremont290
94541Hayward150
94542Hayward30
94544Hayward231
94545Hayward42712
94546Castro Valley281
94550Livermore363
94551Livermore50
94552Castro Valley131
94555Fremont170
94560Newark180
94566Pleasanton272
94568Dublin150
94577San Leandro171
94578San Leandro161
94579San Leandro70
94580San Lorenzo100
94582Pleasanton420
94586Sunol285
94587Union City170
94588Pleasanton230
94601Oakland320
94602Oakland230
94603Oakland190
94605Oakland290
94606Oakland130
94607Oakland30
94608Emeryville90
94609Oakland101
94610Oakland191
94611Oakland573
94612Oakland420
94618Oakland255
94619Oakland300
94621Oakland450
94650Oakland30
94702Berkeley180
94703Berkeley180
94704Berkeley340
94705Berkeley132
94706Albany191
94707Berkeley363
94708Berkeley301
94709Berkeley50
94710Berkeley60



Alpine County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95646Kirkwood73
96120Markleeville4715



Amador County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95601Amador City41
95629Fiddletown258
95640Ione11734
95642Jackson9023
95665Pine Grove10551
95666Pioneer15760
95669Plymouth4213
95675River Pines119
95685Sutter Creek10330
95689Volcano3614
95699Drytown10



Butte County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95917Biggs20
95926Chico220
95927Chico30
95928Chico131
95940Feather Falls10
95941Forbestown10
95942Forest Ranch20
95948Gridley30
95954Magalia40
95965Oroville130
95966Oroville90
95969Paradise332
95973Chico70



Calaveras County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95221Altaville142
95222Angels Camp627
95223Arnold13356
95224Avery2115
95225Burson114
95226Campo Seco21
95228Copperopolis418
95232Glencoe64
95233Hathaway Pines2311
95245Mokelumne Hill6216
95246Mountain Ranch348
95247Murphys12636
95248Rail Road Flat95
95249San Andreas5612
95250Sheep Ranch41
95251Vallecito91
95252Valley Springs17344
95254Wallace156
95255West Point2913
95257Wilseyville22



Colusa County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95987Williams11



Contra Costa County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94506Danville191
94507Alamo50
94509Antioch80
94511Bethel Island20
94513Brentwood50
94514Byron80
94516Canyon20
94517Clayton60
94518Concord191
94519Concord50
94520Concord160
94521Concord173
94523Pleasant Hill251
94524Concord270
94525Crockett10
94526Danville410
94528Diablo30
94530El Cerrito200
94531Antioch20
94547Hercules70
94549Lafayette722
94553Martinez223
94556Moraga190
94561Oakley30
94563Orinda310
94564Pinole110
94565Pittsburg292
94583San Ramon403
94595Walnut Creek60
94596Walnut Creek361
94597Walnut Creek382
94598Walnut Creek273
94801Richmond50
94803El Sobrante70
94804Richmond310
94805Richmond101
94806San Pablo280



Del Norte County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95531Crescent City101
95548Klamath20



El Dorado County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95613Coloma10
95614Cool40
95619Diamond Springs150
95623El Dorado41
95633Garden Valley10
95634Georgetown40
95651Lotus10
95656Mount Aukum10
95664Pilot Hill31
95667Placerville6113
95672Rescue80
95682Shingle Springs421
95684Somerset20
95709Camino90
95726Pollock Pines100
95762El Dorado Hills293
96150South Lake Tahoe626319
96151South Lake Tahoe654164
96152South Lake Tahoe93
96153South Lake Tahoe31
96154South Lake Tahoe66
96155South Lake Tahoe256
96156South Lake Tahoe3721
96157South Lake Tahoe139
96158South Lake Tahoe9244



Fresno County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93210Coalinga130
93602Auberry114
93608Cantua Creek10
93609Caruthers10
93611Clovis381
93612Clovis312
93613Clovis11
93616Del Rey160
93619Clovis52
93622Firebaugh20
93625Fowler30
93626Friant10
93630Kerman3816
93631Kingsburg120
93640Mendota20
93641Miramonte10
93646Orange Cove20
93648Parlier554
93650Fresno10
93651Prather80
93654Reedley151
93656Riverdale30
93657Sanger130
93660San Joaquin20
93662Selma81
93667Tollhouse103
93675Squaw Valley50
93701Fresno21
93702Fresno60
93703Fresno200
93704Fresno240
93705Fresno140
93706Fresno298
93708Fresno10
93710Fresno272
93711Fresno6110
93712Fresno10
93720Fresno332
93722Fresno381
93725Fresno211
93726Fresno240
93727Fresno190
93728Fresno30
93740Fresno172
93747Fresno20
93777Fresno10
93790Fresno10



Glenn County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95913Artois10
95943Glenn10
95951Hamilton City20
95963Orland30
95988Willows60



Humboldt County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95501Eureka311
95502Eureka20
95503Eureka110
95511Alderpoint40
95518Arcata20
95521Arcata160
95524Bayside40
95525Blue Lake20
95526Bridgeville10
95536Ferndale20
95537Fields Landing10
95540Fortuna40
95547Hydesville30
95549Kneeland20
95551Loleta80
95556Orleans10
95558Petrolia10
95560Redway20
95562Rio Dell30
95564Samoa10
95565Scotia10
95569Redcrest10
95570Trinidad20
95573Willow Creek20
95589Whitethorn80



Imperial County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
92227Brawley30
92232Calexico910
92243El Centro30
92244El Centro30
92249Heber10
92251Imperial110



Inyo County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93513Big Pine153
93514Bishop7420
93515Bishop10
93526Independence282
93530Keeler10
93545Lone Pine10



Kern County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93203Arvin60
93205Bodfish30
93206Buttonwillow10
93215Delano30
93220Edison31
93222Frazier Park61
93225Frazier Park73
93238Kernville55
93240Lake Isabella70
93241Lamont30
93243Lebec10
93250McFarland2912
93251McKittrick10
93252Maricopa20
93255Onyx21
93263Shafter362
93268Taft91
93280Wasco270
93283Weldon20
93285Wofford Heights30
93301Bakersfield80
93302Bakersfield10
93303Bakersfield10
93304Bakersfield170
93305Bakersfield71
93306Bakersfield518
93307Bakersfield687
93308Bakersfield382
93309Bakersfield461
93311Bakersfield180
93312Bakersfield445
93313Bakersfield121
93314Bakersfield32
93384Bakersfield10
93389Bakersfield20
93501Mojave50
93505California City71
93516Boron20
93518-Caliente80
93523Edwards10
93524Edwards20
93554Randsburg20
93555Ridgecrest413
93556Ridgecrest10
93560Rosamond121
93561Tehachapi235
93581Tehachapi20
93582Tehachapi20



Kings County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93202Armona20
93204Avenal343
93212Corcoran115
93230Hanford241
93245Lemoore81



Lake County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95422Clearlake130
95423Clearlake Oaks40
95443Glenhaven10
95451Kelseyville92
95453Lakeport190
95457Lower Lake70
95458Lucerne11
95461Middletown40
95485Upper Lake10



Lassen County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96009Bieber20
96109Doyle20
96113Herlong10
96114Janesville91
96128Standish10
96130Susanville342
96137Westwood61



Los Angeles County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
90001Los Angeles431
90002Los Angeles30
90003Los Angeles30
90004Los Angeles540
90005Los Angeles80
90006Los Angeles130
90007Los Angeles401
90008Los Angeles40
90010Los Angeles111
90011Los Angeles10
90012Los Angeles70
90013Los Angeles40
90014Los Angeles40
90016Los Angeles60
90017Los Angeles150
90018Los Angeles40
90019Los Angeles210
90020Los Angeles160
90021Los Angeles20
90023Los Angeles40
90024Los Angeles743
90025Los Angeles907
90026Los Angeles373
90027Los Angeles558
90028Los Angeles110
90029Los Angeles50
90031Los Angeles200
90032Los Angeles91
90033Los Angeles40
90034Los Angeles520
90035Los Angeles380
90036Los Angeles451
90037Los Angeles30
90038Los Angeles20
90039Los Angeles132
90040Los Angeles10
90041Los Angeles231
90042Los Angeles262
90043Los Angeles188
90044Los Angeles20
90045Los Angeles534
90046Los Angeles757
90047Los Angeles100
90048Los Angeles381
90049Los Angeles16216
90050Los Angeles10
90052Los Angeles10
90056Los Angeles50
90057Los Angeles61
90059Los Angeles70
90062Los Angeles10
90063Los Angeles30
90064Los Angeles871
90065Los Angeles133
90066Los Angeles942
90067Los Angeles70
90068Los Angeles1185
90069West Hollywood280
90071Los Angeles10
90076Los Angeles10
90077Los Angeles5815
90078Los Angeles42
90082Los Angeles10
90086Los Angeles10
90093Los Angeles20
90201Bell30
90209Beverly Hills20
90210Beverly Hills14713
90211Beverly Hills340
90212Beverly Hills496
90213Beverly Hills10
90220Compton40
90221Compton10
90222Compton10
90224Compton21
90230Culver City436
90232Culver City130
90233Culver City10
90240Downey60
90241Downey140
90242Downey70
90245El Segundo881
90247Gardena210
90248Gardena20
90249Gardena80
90250Hawthorne190
90254Hermosa Beach341
90255Huntington Park10
90260Lawndale90
90262Lynwood40
90264Malibu10
90265Malibu699
90266Manhattan Beach481
90267Manhattan Beach20
90270Maywood10
90272Pacific Palisades26613
90274Palos Verdes Peninsula29683
90275Rancho Palos Verdes39775
90277Redondo Beach814
90278Redondo Beach510
90280South Gate100
90290Topanga472
90291Venice342
90292Marina Del Rey252
90293Playa Del Rey170
90294Venice10
90295Marina Del Rey10
90301Inglewood42
90302Inglewood40
90303Inglewood10
90304Inglewood10
90305Inglewood20
90309Inglewood10
90401Santa Monica110
90402Santa Monica8116
90403Santa Monica311
90404Santa Monica90
90405Santa Monica653
90406Santa Monica20
90409Santa Monica10
90501Torrance260
90502Torrance216
90503Torrance173
90504Torrance160
90505Torrance615
90509Torrance20
90510Torrance10
90601Whittier80
90602Whittier83
90603Whittier121
90604Whittier122
90605Whittier102
90606Whittier50
90637La Mirada30
90638La Mirada240
90640Montebello140
90650Norwalk130
90660Pico Rivera60
90670Santa Fe Springs30
90701Artesia80
90703Cerritos160
90704Avalon10
90706Bellflower220
90710Harbor City160
90711Lakewood20
90712Lakewood210
90713Lakewood230
90715Lakewood30
90716Hawaiian Gardens20
90717Lomita283
90723Paramount190
90731San Pedro515
90732San Pedro737
90744Wilmington70
90745Carson80
90746Carson90
90755Signal Hill50
90802Long Beach370
90803Long Beach480
90804Long Beach141
90805Long Beach110
90806Long Beach120
90807Long Beach250
90808Long Beach210
90809Long Beach20
90810Long Beach110
90813Long Beach10
90814Long Beach100
90815Long Beach351
90832Long Beach20
91001Altadena453
91006Arcadia480
91007Arcadia160
91009Duarte10
91010Duarte130
91011La Canada Flintridge562
91012La Canada20
91016Monrovia210
91017Monrovia10
91020Montrose100
91024Sierra Madre140
91030South Pasadena3910
91031South Pasadena21
91040Sunland370
91042Tujunga504
91077Arcadia10
91101Pasadena351
91102Pasadena10
91103Pasadena170
91104Pasadena223
91105Pasadena271
91106Pasadena222
91107Pasadena451
91108San Marino421
91109Pasadena20
91118San Marino20
91125Pasadena10
91201Glendale150
91202Glendale190
91203Glendale41
91204Glendale10
91205Glendale41
91206Glendale310
91207Glendale150
91208Glendale400
91209Glendale10
91214La Crescenta330
91301Agoura Hills52658
91302Calabasas30652
91303Canoga Park443
91304Canoga Park18529
91306Winnetka617
91307West Hills21564
91308West Hills21
91309Canoga Park10
91311Chatsworth19632
91313Chatsworth20
91316Encino20361
91321Newhall180
91324Northridge6310
91325Northridge10228
91326Northridge1635
91330Northridge31
91331Pacoima340
91335Reseda11924
91337Reseda10
91340San Fernando10
91342Sylmar6514
91343North Hills977
91344Granada Hills16427
91345Mission Hills200
91350Santa Clarita470
91351Canyon Country230
91352Sun Valley182
91354Valencia180
91355Valencia560
91356Tarzana21034
91357Tarzana10
91363Westlake Village10
91364Woodland Hills29493
91365Woodland Hills188
91367Woodland Hills348117
91372Calabasas94
91376Agoura Hills10
91380Santa Clarita30
91381Stevenson Ranch160
91384Castaic230
91385Valencia10
91387Canyon Country240
91390Santa Clarita120
91392Sylmar20
91394Granada Hills40
91401Van Nuys610
91402Panorama City350
91403Sherman Oaks12720
91405Van Nuys390
91406Van Nuys841
91408Van Nuys11
91409Van Nuys60
91411Van Nuys300
91412Panorama City10
91413Sherman Oaks41
91416Encino10
91423Sherman Oaks16737
91426Encino21
91436Encino28225
91501Burbank140
91502Burbank160
91503Burbank20
91504Burbank380
91505Burbank550
91506Burbank240
91508Burbank10
91510Burbank50
91522Burbank20
91601North Hollywood630
91602North Hollywood490
91604Studio City12320
91605North Hollywood561
91606North Hollywood380
91607Valley Village900
91608Universal City40
91617Valley Village20
91702Azusa50
91706Baldwin Park50
91711Claremont350
91722Covina50
91723Covina40
91724Covina151
91731El Monte30
91732El Monte10
91733South El Monte10
91740Glendora260
91741Glendora100
91744La Puente90
91745Hacienda Heights220
91746La Puente90
91748Rowland Heights200
91750La Verne190
91754Monterey Park60
91755Monterey Park50
91756Monterey Park10
91759Mt Baldy11
91765Diamond Bar366
91766Pomona495
91767Pomona110
91768Pomona30
91769Pomona10
91770Rosemead92
91773San Dimas230
91775San Gabriel160
91776San Gabriel60
91780Temple City160
91788Walnut10
91789Walnut200
91790West Covina130
91791West Covina121
91792West Covina71
91801Alhambra261
91803Alhambra90
93510Acton100
93532Lake Hughes10
93534Lancaster200
93535Lancaster210
93536Lancaster311
93543Littlerock40
93544Llano20
93550Palmdale290
93551Palmdale300
93552Palmdale50
93553Pearblossom70
93590Palmdale10
93591Palmdale10



Madera County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93601Ahwahnee280
93604Bass Lake165
93610Chowchilla40
93614Coarsegold241
93637Madera130
93638Madera222
93643North Fork5016
93644Oakhurst14425
93645O Neals10
93653Raymond60
93669Wishon31



Marin County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94901San Rafael410
94903San Rafael272
94904Greenbrae182
94920Belvedere Tiburon200
94924Bolinas30
94925Corte Madera131
94930Fairfax80
94933Forest Knolls30
94937Inverness52
94939Larkspur120
94941Mill Valley432
94942Mill Valley10
94945Novato290
94946-Nicasio10
94947Novato403
94949Novato170
94950Olema10
94956Point Reyes Station30
94957Ross30
94960San Anselmo150
94965Sausalito280
94970Stinson Beach10
94973Woodacre10
94979San Anselmo10



Mariposa County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93623Fish Camp31
95306Catheys Valley51
95311Coulterville30
95318El Portal60
95325Hornitos10
95338Mariposa261
95345Midpines10
95389Yosemite National Park40



Mendocino County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95410Albion10
95415Boonville20
95428Covelo10
95437Fort Bragg104
95456Littleriver10
95459Manchester20
95460Mendocino20
95463Navarro10
95468Point Arena20
95469Potter Valley52
95470Redwood Valley40
95482Ukiah140
95490Willits70



Merced County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93635Los Banos170
93661Santa Rita Park10
95301Atwater100
95315Delhi20
95317El Nido10
95322Gustine20
95324Hilmar20
95333Le Grand10
95340Merced359
95344Merced11
95348Merced61



Modoc County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96006Adin20
96101Alturas50
96104Cedarville52
96110Eagleville10
96112Fort Bidwell283
96116Likely11



Mono County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93517Bridgeport31
93541Lee Vining40
93546Mammoth Lakes123
96107Coleville52



Monterey County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93426Bradley40
93450San Ardo10
93901Salinas1215
93902Salinas10
93905Salinas273
93906Salinas1072
93907Salinas1141
93908Salinas1413
93912Salinas10
93921Carmel191
93922Carmel30
93923Carmel15611
93924Carmel Valley9225
93925Chualar20
93926Gonzales51
93927Greenfield80
93930King City285
93933Marina711
93940Monterey29316
93942Monterey20
93950Pacific Grove1891
93953Pebble Beach812
93955Seaside850
93960Soledad60
93962Spreckels10
95004Aromas180
95012Castroville70
95039Moss Landing10



Napa County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94503American Canyon110
94508Angwin30
94515Calistoga10
94558Napa809
94559Napa152
94574Saint Helena154
94581Napa10
94599Yountville40



Nevada County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95712Chicago Park20
95728Soda Springs30
95924Cedar Ridge30
95945Grass Valley6214
95946Penn Valley210
95949Grass Valley254
95959Nevada City5616
95960North San Juan20
95975Rough And Ready50
96160Truckee6418
96161Truckee27872
96162Truckee5015



Orange County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
90620Buena Park200
90621Buena Park71
90623La Palma190
90630Cypress501
90631La Habra355
90680Stanton90
90720Los Alamitos330
90740Seal Beach241
90743Surfside10
92602Irvine51
92603Irvine150
92604Irvine414
92606Irvine130
92607Laguna Niguel10
92610Foothill Ranch211
92612Irvine130
92614Irvine372
92615Huntington Beach40
92618Irvine240
92620Irvine433
92624Capistrano Beach31
92625Corona Del Mar425
92626Costa Mesa705
92627Costa Mesa442
92628Costa Mesa10
92629Dana Point340
92630Lake Forest880
92637Laguna Woods70
92646Huntington Beach690
92647Huntington Beach971
92648Huntington Beach642
92649Huntington Beach472
92651Laguna Beach462
92653Laguna Hills1085
92654Laguna Hills60
92655Midway City100
92656Aliso Viejo732
92657Newport Coast190
92660Newport Beach530
92663Newport Beach608
92672San Clemente474
92673San Clemente631
92674San Clemente11
92675San Juan Capistrano394
92676Silverado30
92677Laguna Niguel1349
92679Trabuco Canyon1000
92683Westminster470
92685Westminster550
92688Rancho Santa Margarita790
92690Mission Viejo40
92691Mission Viejo774
92692Mission Viejo1163
92693San Juan Capistrano30
92697Irvine20
92698Irvine10
92701Santa Ana40
92703Santa Ana40
92704Santa Ana142
92705Santa Ana645
92706Santa Ana130
92707Santa Ana140
92708Fountain Valley560
92728Fountain Valley10
92780Tustin391
92782Tustin234
92801Anaheim282
92802Anaheim170
92804Anaheim300
92805Anaheim271
92806Anaheim291
92807Anaheim565
92808Anaheim320
92814Anaheim10
92817Anaheim20
92821Brea581
92823Brea52
92831Fullerton413
92832Fullerton120
92833Fullerton242
92834Fullerton80
92835Fullerton232
92840Garden Grove580
92841Garden Grove90
92843Garden Grove50
92844Garden Grove130
92845Garden Grove230
92861Villa Park124
92865Orange1454
92866Orange180
92867Orange433
92868Orange40
92869Orange371
92870Placentia608
92885Yorba Linda10
92886Yorba Linda767
92887Yorba Linda464



Placer County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95602Auburn80
95603Auburn492
95604Auburn20
95631Foresthill132
95648Lincoln140
95650Loomis170
95658Newcastle140
95661Roseville252
95663Penryn10
95677Rocklin163
95678Roseville310
95681Sheridan10
95701Alta11
95703Applegate123
95713Colfax123
95717Gold Run10
95722Meadow Vista60
95736Weimar20
95746Granite Bay152
95747Roseville120
95765Rocklin172
96140Carnelian Bay297
96141Homewood91
96142Tahoma91
96143Kings Beach469
96145Tahoe City8922
96146Olympic Valley253
96148Tahoe Vista235



Plumas County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95934Crescent Mills10
95947Greenville10
95956Meadow Valley10
95971Quincy218
96020Chester20
96103Blairsden-Graeagle40
96105Chilcoot10
96122Portola80



Riverside County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
91718Corona60
91719Corona110
91720Corona210
91752Mira Loma30
91760Norco30
92201Indio100
92202Indio10
92203Indio50
92210Indian Wells30
92211Palm Desert90
92220Banning60
92223Beaumont130
92225Blythe10
92230Cabazon20
92234Cathedral City110
92235Cathedral City10
92239Desert Center10
92240Desert Hot Springs40
92241Desert Hot Springs20
92253La Quinta150
92254Mecca10
92258North Palm Springs50
92260Palm Desert211
92261Palm Desert11
92262Palm Springs371
92263Palm Springs20
92264Palm Springs160
92270Rancho Mirage202
92274Thermal10
92320Calimesa30
92501Riverside61
92503Riverside160
92504Riverside201
92505Riverside110
92506Riverside221
92507Riverside330
92508Riverside70
92509Riverside110
92519Riverside10
92530Lake Elsinore30
92532Lake Elsinore10
92536Aguanga10
92543Hemet80
92544Hemet220
92545Hemet60
92546Hemet10
92548Homeland10
92549Idyllwild92
92551Moreno Valley40
92553Moreno Valley130
92555Moreno Valley40
92557Moreno Valley80
92561Mountain Center20
92562Murrieta291
92563Murrieta202
92567Nuevo20
92570Perris20
92571Perris10
92582San Jacinto92
92583San Jacinto120
92584Menifee30
92585Sun City60
92586Sun City70
92587Sun City227
92590Temecula20
92591Temecula80
92592Temecula140
92595Wildomar50
92860Norco10
92879Corona50
92880Corona141
92881Corona50
92882Corona300
92883Corona81



Sacramento County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94203Sacramento41
94234Sacramento52
94271Sacramento11
95608Carmichael262
95610Citrus Heights141
95611Citrus Heights20
95621Citrus Heights171
95624Elk Grove181
95626Elverta40
95628Fair Oaks515
95630Folsom416
95632Galt61
95638Herald20
95641Isleton10
95655Mather31
95660North Highlands211
95662Orangevale200
95670Rancho Cordova290
95671Represa10
95673Rio Linda20
95683Sloughhouse31
95690Walnut Grove10
95693Wilton10
95741Rancho Cordova40
95742Rancho Cordova60
95757Elk Grove20
95758Elk Grove211
95814Sacramento30
95815Sacramento40
95816Sacramento191
95817Sacramento50
95818Sacramento377
95819Sacramento120
95820Sacramento90
95821Sacramento262
95822Sacramento120
95823Sacramento50
95824Sacramento60
95825Sacramento90
95826Sacramento211
95827Sacramento83
95828Sacramento142
95829Sacramento141
95831Sacramento322
95832Sacramento20
95833Sacramento180
95834Sacramento390
95835Sacramento31
95841Sacramento121
95842Sacramento110
95843Antelope211
95851Sacramento20
95864Sacramento161
95899Sacramento80



San Benito County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95023Hollister110
95045San Juan Bautista31
95075Tres Pinos10



San Bernardino County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
91701Alta Loma320
91708Chino20
91709Chino Hills270
91710Chino140
91730Rancho Cucamonga340
91737Alta Loma182
91739Rancho Cucamonga140
91761Ontario70
91762Ontario190
91763Montclair30
91764Ontario221
91784Upland160
91785Upland10
91786Upland222
92242Earp10
92252Joshua Tree60
92256Morongo Valley21
92268Pioneertown20
92277Twentynine Palms170
92278Twentynine Palms77314
92284Yucca Valley170
92285Landers20
92286Yucca Valley10
92301Adelanto70
92307Apple Valley271
92308Apple Valley80
92310Fort Irwin220
92311Barstow362
92312Barstow20
92313Grand Terrace40
92314Big Bear City81
92315Big Bear Lake30
92316Bloomington20
92317Blue Jay43
92322Cedarpines Park11
92324Colton100
92325Crestline1912
92326Crest Park10
92329Phelan20
92335Fontana340
92336Fontana160
92337Fontana30
92338Ludlow10
92340Hesperia20
92341Green Valley Lake1511
92342Helendale40
92345Hesperia60
92346Highland170
92347Hinkley10
92352Lake Arrowhead61
92354Loma Linda100
92356Lucerne Valley53
92358Lytle Creek10
92359Mentone40
92363Needles550
92366Mountain Pass274
92371Phelan10
92373Redlands290
92374Redlands850
92376Rialto120
92377Rialto40
92382Running Springs52
92386Sugarloaf30
92391Twin Peaks71
92392Victorville170
92393Victorville10
92395Victorville40
92397Wrightwood91
92398Yermo20
92399Yucaipa100
92401San Bernardino30
92404San Bernardino100
92405San Bernardino60
92407San Bernardino70
92410San Bernardino10
92412San Bernardino10
92416San Bernardino10
93558Red Mountain10



San Diego County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
91901Alpine80
91902Bonita20
91903Alpine20
91906Campo41
91910Chula Vista202
91911Chula Vista40
91913Chula Vista30
91914Chula Vista50
91915Chula Vista30
91916Descanso80
91931Guatay10
91932Imperial Beach200
91934Jacumba10
91935Jamul60
91941La Mesa150
91942La Mesa81
91943La Mesa10
91945Lemon Grove20
91950National City110
91962Pine Valley11
91977Spring Valley160
91978Spring Valley10
92003Bonsall30
92004Borrego Springs20
92007Cardiff by the Sea70
92008Carlsbad351
92009Carlsbad230
92014Del Mar130
92019El Cajon170
92020El Cajon220
92021El Cajon341
92022El Cajon10
92024Encinitas425
92025Escondido426
92026Escondido211
92027Escondido111
92028Fallbrook573
92029Escondido51
92030Escondido10
92033Escondido40
92036Julian120
92037La Jolla415
92038La Jolla20
92040Lakeside550
92054Oceanside320
92055Camp Pendleton10
92056Oceanside370
92057Oceanside130
92058Oceanside10
92059Pala40
92060Palomar Mountain11
92061Pauma Valley10
92064Poway525
92065Ramona586
92067Rancho Santa Fe61
92069San Marcos292
92070Santa Ysabel20
92071Santee272
92072Santee10
92075Solana Beach152
92078San Marcos50
92081Vista30
92082Valley Center94
92083Vista232
92084Vista301
92085Vista10
92086Warner Springs11
92088Fallbrook10
92091Rancho Santa Fe20
92092La Jolla10
92093La Jolla21
92101San Diego50
92102San Diego60
92103San Diego171
92104San Diego192
92105San Diego80
92106San Diego151
92107San Diego172
92108San Diego60
92109San Diego130
92110San Diego150
92111San Diego123
92113San Diego20
92114San Diego20
92115San Diego193
92116San Diego70
92117San Diego142
92118Coronado160
92119San Diego170
92120San Diego252
92121San Diego31
92122San Diego250
92123San Diego80
92124San Diego160
92126San Diego4617
92127San Diego100
92128San Diego210
92129San Diego190
92130San Diego280
92131San Diego160
92139San Diego40
92154San Diego30
92160San Diego80
92173San Ysidro141



San Francisco County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94101San Francisco20
94102San Francisco360
94103San Francisco91
94104San Francisco50
94105San Francisco100
94107San Francisco340
94108San Francisco50
94109San Francisco270
94110San Francisco281
94111San Francisco130
94112San Francisco210
94114San Francisco452
94115San Francisco90
94116San Francisco260
94117San Francisco204
94118San Francisco221
94119San Francisco10
94121San Francisco230
94122San Francisco382
94123San Francisco100
94124San Francisco70
94127San Francisco262
94129San Francisco101
94131San Francisco170
94132San Francisco30
94133San Francisco200
94134San Francisco51
94137San Francisco10
94142San Francisco10
94188San Francisco10



San Joaquin County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95204Stockton100
95205Stockton81
95206Stockton50
95207Stockton3712
95209Stockton82
95210Stockton31
95212Stockton20
95215Stockton10
95219Stockton50
95220Acampo40
95227Clements10
95236Linden31
95237Lockeford10
95240Lodi152
95242Lodi83
95258Woodbridge10
95269Stockton21
95290Stockton10
95304Banta10
95320Escalon41
95330Lathrop20
95336Manteca30
95337Manteca41
95366Ripon70
95376Tracy121
95377Tracy20



San Luis Obispo County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93401San Luis Obispo1733
93402Los Osos1220
93405San Luis Obispo1033
93406San Luis Obispo30
93420Arroyo Grande20510
93422Atascadero18336
93423Atascadero20
93424Avila Beach10
93428Cambria640
93430Cayucos202
93432Creston30
93433Grover Beach420
93442Morro Bay580
93443Morro Bay10
93444Nipomo860
93445Oceano230
93446Paso Robles15714
93447Paso Robles10
93449Pismo Beach404
93451San Miguel102
93452San Simeon3718
93453Santa Margarita100
93465Templeton6917



San Mateo County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94002Belmont8611
94005Brisbane50
94010Burlingame852
94014Daly City290
94015Daly City390
94018El Granada40
94019Half Moon Bay380
94020La Honda93
94021Loma Mar10
94025Menlo Park8521
94026Menlo Park10
94027Atherton5017
94028Portola Valley374
94029Menlo Park10
94030Millbrae380
94037Montara130
94038Moss Beach160
94044Pacifica661
94060Pescadero10
94061Redwood City371
94062Redwood City11326
94063Redwood City162
94065Redwood City140
94066San Bruno443
94070San Carlos835
94074San Gregorio10
94080South San Francisco922
94128San Francisco10
94303Palo Alto200
94401San Mateo90
94402San Mateo1356
94403San Mateo681
94404San Mateo450



Santa Barbara County
Radon zone : 1

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93013Carpinteria550
93014Carpinteria31
93067Summerland5829
93101Santa Barbara681
93102Santa Barbara30
93103Santa Barbara859
93105Santa Barbara35497
93106Santa Barbara30
93107Santa Barbara20
93108Santa Barbara16526
93109Santa Barbara1003
93110Santa Barbara1229
93111Santa Barbara14611
93116Goleta123
93117Goleta31248
93118Goleta20
93120Santa Barbara10
93130Santa Barbara94
93140Santa Barbara192
93150Santa Barbara31
93160Santa Barbara30
93190Santa Barbara20
93427Buellton80
93434Guadalupe10
93436Lompoc343115
93437Lompoc21
93438Lompoc132
93440Los Alamos20
93454Santa Maria342
93455Santa Maria561
93456Santa Maria20
93458Santa Maria30
93460Santa Ynez202
93463Solvang191
93464Solvang20



Santa Clara County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94022Los Altos493
94023Los Altos60
94024Los Altos390
94040Mountain View320
94041Mountain View110
94042Mountain View20
94043Mountain View211
94085Sunnyvale387
94086Sunnyvale293
94087Sunnyvale587
94089Sunnyvale100
94301Palo Alto377
94304Palo Alto30
94305Palo Alto81
94306Palo Alto293
95002Alviso10
95008Campbell362
95014Cupertino430
95020Gilroy140
95030Los Gatos245
95031Los Gatos10
95032Los Gatos330
95033Los Gatos11237
95035Milpitas290
95037Morgan Hill210
95038Morgan Hill20
95046San Martin52
95050Santa Clara181
95051Santa Clara390
95054Santa Clara90
95056Santa Clara140
95070Saratoga559
95108San Jose20
95110San Jose40
95111San Jose50
95112San Jose150
95113San Jose50
95116San Jose40
95117San Jose191
95118San Jose272
95119San Jose20
95120San Jose280
95121San Jose70
95122San Jose60
95123San Jose330
95124San Jose231
95125San Jose697
95126San Jose480
95127San Jose201
95128San Jose182
95129San Jose200
95130San Jose40
95131San Jose210
95132San Jose90
95133San Jose30
95134San Jose50
95135San Jose50
95136San Jose30
95138San Jose90
95139San Jose40
95140Mount Hamilton10
95148San Jose80
95150San Jose11
95151San Jose11
95158San Jose10
95160San Jose10
95164San Jose20



Santa Cruz County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95001Aptos50
95003Aptos2569
95005Ben Lomond7421
95006Boulder Creek706
95010Capitola671
95017Davenport20
95018Felton9623
95019Freedom80
95060Santa Cruz48228
95061Santa Cruz20
95062Santa Cruz2553
95063Santa Cruz40
95064Santa Cruz192
95065Santa Cruz1023
95066Scotts Valley15420
95067Scotts Valley10
95073Soquel942
95076Watsonville2231



Shasta County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96001Redding370
96002Redding230
96003Redding353
96007Anderson142
96008Bella Vista20
96013Burney50
96019Shasta Lake61
96022Cottonwood130
96028Fall River Mills20
96049Redding64
96051Lakehead10
96056McArthur30
96062Millville10
96065Montgomery Creek20
96069Oak Run11
96073Palo Cedro50
96076Platina10
96079Shasta Lake10
96084Round Mountain10
96087Shasta20
96088Shingletown80
96089Summit City20
96099Redding10



Sierra County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96118Loyalton10
96124Calpine30
96126Sierraville10



Siskiyou County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96023Dorris30
96025Dunsmuir30
96027Etna30
96032Fort Jones10
96038Grenada20
96039Happy Camp20
96044Hornbrook10
96050Klamath River20
96057McCloud40
96064Montague50
96067Mount Shasta161
96086Seiad Valley10
96094Weed50
96097Yreka90
96134Tulelake60



Solano County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94510Benicia170
94533Fairfield370
94534Fairfield100
94571Rio Vista40
94585Suisun City80
94589Vallejo100
94590Vallejo130
94591Vallejo112
95620Dixon50
95687Vacaville292
95688Vacaville130



Sonoma County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
94927Rohnert Park11
94928Rohnert Park141
94931Cotati70
94951Penngrove30
94952Petaluma312
94954Petaluma150
95401Santa Rosa260
95402Santa Rosa40
95403Santa Rosa100
95404Santa Rosa191
95405Santa Rosa141
95407Santa Rosa180
95409Santa Rosa163
95416Boyes Hot Springs20
95425Cloverdale50
95436Forestville30
95439Fulton40
95442Glen Ellen20
95446Guerneville10
95448Healdsburg173
95452Kenwood20
95471Rio Nido10
95472Sebastopol220
95473Sebastopol30
95476Sonoma300
95486Villa Grande20
95492Windsor150
95497The Sea Ranch10



Stanislaus County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95307Ceres30
95316Denair20
95323Hickman20
95326Hughson30
95329La Grange3315
95350Modesto130
95351Modesto91
95355Modesto192
95356Modesto92
95357Modesto10
95358Modesto30
95360Newman30
95361Oakdale241
95363Patterson10
95367Riverbank64
95380Turlock80
95382Turlock20
95386Waterford10



Sutter County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95659Nicolaus10
95674Rio Oso30
95953Live Oak70
95991Yuba City193
95992Yuba City10
95993Yuba City123



Tehama County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
96021Corning60
96055Los Molinos20
96059Manton10
96063Mineral10
96080Red Bluff191
96090Tehama10



Trinity County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95563Salyer20
95595Zenia10
96010Big Bar10
96041Hayfork30
96052Lewiston20
96091Trinity Center20
96093Weaverville20



Tulare County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
93207California Hot Springs62
93218Ducor10
93219Earlimart10
93221Exeter71
93223Farmersville20
93235Ivanhoe20
93237Kaweah10
93244Lemon Cove20
93247Lindsay90
93257Porterville350
93261Richgrove10
93265Springville203
93267Strathmore30
93270Terra Bella139
93271Three Rivers2416
93272Tipton10
93274Tulare191
93277Visalia4811
93279Visalia20
93286Woodlake10
93291Visalia201
93292Visalia91
93603Badger10
93615Cutler10
93618Dinuba200
93647Orosi10



Tuolumne County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95305Big Oak Flat71
95309Chinese Camp10
95310Columbia6323
95321Groveland16273
95327Jamestown6818
95335Long Barn209
95346Mi Wuk Village4721
95347Moccasin11
95364Pinecrest113
95370Sonora625203
95372Soulsbyville4711
95373Standard30
95375Strawberry63
95379Tuolumne7231
95383Twain Harte15961



Ventura County
Radon zone : 1

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
91319Newbury Park10
91320Newbury Park21611
91358Thousand Oaks20
91359Thousand Oaks150
91360Thousand Oaks23118
91361Westlake Village29223
91362Thousand Oaks56377
91377Oak Park12015
93001Ventura678
93002Ventura40
93003Ventura1396
93004Ventura590
93005Ventura20
93006Ventura20
93010Camarillo12711
93011Camarillo80
93012Camarillo1122
93015Fillmore235
93016Fillmore40
93020Moorpark20
93021Moorpark25211
93022Oak View1143
93023Ojai2518
93024Ojai20
93030Oxnard381
93031Oxnard40
93032Oxnard10
93033Oxnard120
93035Oxnard220
93036Oxnard100
93041Port Hueneme230
93060Santa Paula612
93061Santa Paula31
93062Simi Valley300
93063Simi Valley1447
93065Simi Valley25911
93066Somis175



Yolo County
Radon zone : 3

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95605Broderick40
95607Capay10
95612Clarksburg20
95616Davis472
95618El Macero160
95627Esparto10
95645Knights Landing10
95691West Sacramento370
95695Woodland220
95698Zamora10
95776Woodland20



Yuba County
Radon zone : 2

Zip codeCityNumber of testsNumber of tests >= 4 pCi/L
95692Wheatland21
95901Marysville200
95903Beale AFB10
95918Browns Valley20
95919Brownsville20
95922Camptonville20
95977Smartville10




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