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APPENDIX B
RADON MITIGATION


  • SECTION B101
    GENERAL

    B101.1 Radon mitigation.
    Buildings in areas of High and Moderate Radon Potential (Zone 1 and 2), as determined by Figure B101.1 and Table B101.1 shall comply with Sections B201.1 through B201.10.

    FIGURE B101.1
    EPA MAP OF RADON ZONES

    a. pCi/L standard for picocuries per liter of radon gas. EPA recommends that all homes that measure 4 pCi/L and greater be mitigated
    The United States Environmental Protection Agency and the United States Geological Survey have evaluated the radon potential in the United States and have developed a map of radon zones designed to assist code officials in deciding whether radon-resistant features are applicable in new construction.
    The map assigns each of the 3,141 counties in the United States to one of three zones based on radon potential. Each zone designation reflects the average short-term radon measurement result that can be expected to be measured in a building without the implementation of radon control methods. The radon zone designation of highest priority is Zone 1 and Zone 2. Table 804.2 lists the Zone 1 counties illustrated on the map. The counties are listed by state and alphabetically within each zone. More detailed information can be obtained from state-specific booklets (EPA-402-R-93-021 through 070) available through the U.S. EPA National Service Center for Environmental Publications (NSCEP), U.S. EPA Regional Offices or State Radon Offices.

    TABLE B101.1
    EPA RADON ZONE 1 and 2 COUNTIES BY STATEa

    ALABAMAALASKAZone 2GilpinNew Haven
    Zone 1Zone 2AlamedaGrandNew London
    CalhounAnchorage MunicipalityAlpineGunnison
    ClayDillingham Census AreaAmadorHuerfanoZone 2
    CleburneFairbanks North StarCalaverasJacksonLitchfield
    ColbertBoroughContra CostaJeffersonTolland
    CoosaKenai PeninsulaEl DoradoKiowaWindham
    FranklinBoroughFresnoKit Carson
    JacksonMatanuska-SusitnaInyoLa PlataDELAWARE
    LauderdaleBoroughKernLarimerZone 2
    LawrenceSoutheast FairbanksLos AngelesLas AnimasNew Castle
    LimestoneCensus AreaMaderaLincoln
    MadisonMariposaLoganFLORIDA
    MorganARIZONAMonoMesaZone 2
    TalladegaZone 2MontereyMoffatAlachua
    ApacheNevadaMontezumaCitrus
    Zone 2CochisePlacerMontroseColumbia
    AutaugaCoconinoPlumasMorganHillsborough
    BarbourGilaRiversideOteroLeon
    BibbGrahamSan BenitoOurayMarion
    BlountGreenleeSan BernardinoParkMiami-Dade
    BullockLa PazSan FranciscoPhillipsPolk
    CherokeeMaricopaSan Luis ObispoPitkinUnion
    ChiltonMohaveSan MateoProwers
    CullmanNavajoSanta ClaraPuebloGEORGIA
    DallasPimaSanta CruzRio BlancoZone 1
    DeKalbPinalSierraSan MiguelCobb
    ElmoreSanta CruzTulareSedgwickDeKalb
    EtowahYavapaiTuolumneSummitFulton
    FayetteYumaYubaTellerGwinnett
    GreeneWashington
    HaleARKANSASCOLORADOWeldZone 2
    JeffersonZone 2Zone 1YumaBanks
    LamarBaxterAdamsBarrow
    LeeBentonArapahoeZone 2Bartow
    LowndesBooneBacaAlamosaButts
    MaconCarrollBentArchuletaCarroll
    MarionFultonBoulderConejosCatoosa
    MarshallGarlandBroomfieldCostillaCherokee
    MontgomeryIndependenceChaffeeEagleClarke
    PerryIzardCheyenneHinsdaleClayton
    PickensMarionClear CreekLakeCoweta
    RandolphMontgomeryCrowleyMineralDawson
    RussellRandolphCusterRio GrandeDouglas
    ShelbySearcyDeltaRouttElbert
    St ClairSharpDenverSaguacheFannin
    SumterStoneDoloresSan JuanFayette
    TuscaloosaDouglasFloyd
    WalkerCALIFORNIAEl PasoCONNECTICUTForsyth
    WinstonZone 1ElbertZone 1Franklin
    Santa BarbaraFremontFairfieldGilmer
    VenturaGarfieldMiddlesexGreene

    (continued)

    TABLE B101.1—continued
    EPA RADON ZONE 1 and 2 COUNTIES BY STATEa

    HabershamIdahoJerseyHardinHendricks
    HallKootenaiJo DaviessJacksonHenry
    HaralsonLatahKaneJasperHoward
    HarrisLemhiKendallJeffersonHuntington
    HartShoshoneKnoxJohnsonJay
    HeardValleyLaSalleKankakeeJennings
    HenryLeeLakeJohnson
    JacksonZone 2LivingstonLawrenceKosciusko
    JasperAdaLoganMacoupinLaGrange
    LamarBannockMaconMadisonLawrence
    LumpkinBear LakeMarshallMarionMadison
    MadisonBinghamMasonMcHenryMarion
    MeriwetherBonnevilleMcDonoughMonroeMarshall
    MonroeCanyonMcLeanMontgomeryMiami
    MorganCaribouMenardPerryMonroe
    NewtonCassiaMercerPopeMontgomery
    OconeeFranklinMorganRandolphNoble
    OglethorpeJeffersonMoultrieRichlandOrange
    PauldingJeromeOgleSalinePutnam
    PickensLincolnPeoriaShelbyRandolph
    PikeMadisonPiattSt ClairRush
    RabunMinidokaPikeUnionScott
    RichmondOneidaPutnamWabashShelby
    RockdaleOwyheeRock IslandWashingtonSt Joseph
    SpaldingPayetteSangamonWayneSteuben
    StephensPowerSchuylerWhiteTippecanoe
    TalbotTetonScottWillTipton
    TownsTwin FallsStarkWilliamsonUnion
    TroupStephensonVermillion
    UnionILLINOISTazewellINDIANAWabash
    UpsonZone 1VermilionZone 1Warren
    WalkerAdamsWarrenAdamsWashington
    WaltonBooneWhitesideAllenWayne
    WhiteBrownWinnebagoBartholomewWells
    WhitfieldBureauWoodfordBentonWhite
    CalhounBlackfordWhitley
    IDAHOCarrollZone 2Boone
    Zone 1CassBondCarrollZone 2
    BenewahChampaignChristianCassBrown
    BlaineColesClarkClarkClay
    BoiseDe KalbClayClintonCrawford
    BonnerDe WittClintonDe KalbDaviess
    BoundaryDouglasCookDecaturDearborn
    ButteEdgarCrawfordDelawareDubois
    CamasFordCumberlandElkhartFloyd
    ClarkFultonDuPageFayetteFranklin
    ClearwaterGreeneEdwardsFountainGibson
    CusterGrundyEffinghamFultonGreene
    ElmoreHancockFayetteGrantJackson
    FremontHendersonFranklinHamiltonJasper
    GoodingHenryGallatinHancockJefferson
    IroquoisHamiltonHarrisonKnox

    (continued)

    TABLE B101.1—continued
    EPA RADON ZONE 1 and 2 COUNTIES BY STATEa

    LakeDes MoinesSacLincolnElk
    LaPorteDickinsonScottLoganFranklin
    MartinDubuqueShelbyMarionGreenwood
    MorganEmmetSiouxMarshallHarper
    NewtonFayetteStoryMcPhersonHarvey
    OhioFloydTamaMeadeJefferson
    OwenFranklinTaylorMitchellLabette
    ParkeFremontUnionNemahaLinn
    PerryGreeneVan BurenNessLyon
    PikeGrundyWapelloNortonMiami
    PorterGuthrieWarrenOsborneMontgomery
    PoseyHamiltonWashingtonOttawaMorris
    PulaskiHancockWaynePawneeMorton
    RipleyHardinWebsterPhillipsNeosho
    SpencerHarrisonWinnebagoPottawatomieOsage
    StarkeHenryWinneshiekPrattReno
    SullivanHowardWoodburyRawlinsSedgwick
    SwitzerlandHumboldtWorthRepublicSeward
    VanderburghIdaWrightRiceShawnee
    VigoIowaRileyStafford
    WarrickJacksonKANSASRooksStevens
    JasperZone 1RushSumner
    IOWAJeffersonAtchisonRussellWabaunsee
    Zone 1JohnsonBartonSalineWilson
    AdairJonesBrownScottWoodson
    AdamsKeokukCheyenneSheridan
    AllamakeeKossuthClayShermanKENTUCKY
    AppanooseLeeCloudSmithZone 1
    AudubonLinnDecaturStantonAdair
    BentonLouisaDickinsonThomasAllen
    Black HawkLucasDouglasTregoBarren
    BooneLyonEllisWallaceBourbon
    BremerMadisonEllsworthWashingtonBoyle
    BuchananMahaskaFinneyWichitaBullitt
    Buena VistaMarionFordWyandotteCasey
    ButlerMarshallGearyClark
    CalhounMillsGoveZone 2Cumberland
    CarrollMitchellGrahamAllenFayette
    CassMononaGrantAndersonFranklin
    CedarMonroeGrayBarberGreen
    Cerro GordoMontgomeryGreeleyBourbonHarrison
    CherokeeMuscatineHamiltonButlerHart
    ChickasawO′BrienHaskellChaseJefferson
    ClarkeOsceolaHodgemanChautauquaJessamine
    ClayPageJacksonCherokeeLincoln
    ClaytonPalo AltoJewellClarkMarion
    ClintonPlymouthJohnsonCoffeyMercer
    CrawfordPocahontasKearnyComancheMetcalfe
    DallasPolkKingmanCowleyMonroe
    DavisPottawattamieKiowaCrawfordNelson
    DecaturPoweshiekLaneDoniphanPendleton
    DelawareRinggoldLeavenworthEdwardsPulaski

    (continued)

    TABLE B101.1—continued
    EPA RADON ZONE 1 and 2 COUNTIES BY STATEa

    RobertsonLetcherYorkJacksonDouglas
    RussellLewisZone 2KalamazooFaribault Count
    ScottLivingstonKnoxLenaweeFillmore
    TaylorLoganSagadahocSt JosephFreeborn
    WarrenLyonWaldoWashtenawGoodhue
    WoodfordMadisonWashingtonGrant
    MagoffinZone 2Hennepin
    Zone 2MartinMARYLANDAlconaHouston
    AndersonMasonZone 1AlgerHubbard
    BathMcCrearyBaltimoreAlpenaJackson
    BellMcLeanCalvertAntrimKanabec
    BooneMeadeCarrollBaragaKandiyohi
    BoydMenifeeFrederickBarryKittson
    BrackenMontgomeryHarfordCharlevoixLac qui Parle
    BreathittMorganHowardClintonLe Sueur
    BreckinridgeMuhlenbergMontgomeryDickinsonLincoln
    ButlerNicholasWashingtonEatonLyon
    CaldwellOhioEmmetMahnomen
    CampbellOldhamZone 2GeneseeMarshall
    CarrollOwenAlleganyGogebicMartin
    CarterOwsleyAnne ArundelHoughtonMcLeod
    ChristianPerryBaltimore CityInghamMeeker
    ClayPikeCecilIoniaMower
    ClintonPowellCharlesIronMurray
    CrittendenRockcastleGarrettKentNicollet
    DaviessRowanPrince George′sKeweenawNobles
    EdmonsonShelbySomersetLapeerNorman
    ElliottSimpsonLeelanauOlmsted
    EstillSpencerMASSACHUSETTSLivingstonOtter Tail
    FlemingToddZone 1MarquettePennington
    FloydTriggEssexMenomineePipestone
    GallatinTrimbleMiddlesexMonroePolk
    GarrardUnionWorcesterMontcalmPope
    GrantWashingtonMontmorencyRamsey
    GraysonWayneZone 2OaklandRed Lake
    GreenupWebsterBarnstableOtsegoRedwood
    HancockWhitleyBerkshirePresque IsleRenville
    HardinWolfeBristolSanilacRice
    HarlanDukesShiawasseeRock
    HendersonMAINEFranklinRoseau
    HenryZone 1HampdenMINNESOTAScott
    HopkinsAndroscogginHampshireZone 1Sherburne
    JacksonAroostookNantucketBeckerSibley
    JohnsonCumberlandNorfolkBig StoneStearns
    KentonFranklinPlymouthBlue EarthSteele
    KnottHancockBrownStevens
    KnoxKennebecMICHIGANCarverSwift
    LarueLincolnZone 1ChippewaTodd
    LaurelOxfordBranchClayTraverse
    LawrencePenobscotCalhounCottonwoodWabasha
    LeePiscataquisCassDakotaWadena
    LeslieSomersetHillsdaleDodgeWaseca

    (continued)

    TABLE B101.1—continued
    EPA RADON ZONE 1 and 2 COUNTIES BY STATEa

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