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Combined exposures · In-home geology

Radon and arsenic in Minnesota homes

Two in-home geologic exposures, estimated for the same Minnesota ZIP codes: modeled indoor radon and modeled groundwater arsenic. This page is scoped to Minnesota.

MinnesotaData release 2026Modeled inputs

Across parts of Minnesota, two separate geologic exposures show up in the same ZIP codes — a modeled likelihood of elevated arsenic in groundwater, and modeled indoor radon. Here is exactly what each measurement is, and the federal reference each is measured against.

How we measure this →
Modeled indoor radonEPA action levelModeled · ZCTA-native

Where the modeled value crosses the line, this area's modeled radon runs above EPA's 4 pCi/L action level — the level at which the EPA recommends taking action to reduce indoor radon. It is an action level, a recommendation to act, never a regulatory limit.

EPA indoor-radon action level — 4 pCi/L. A recommendation to act, not a regulatory limit.

Modeled groundwater arsenicEPA public-water limitModeled likelihood

USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems. Most private wells are federally unregulated, so this is a modeled likelihood, never a measured exceedance.

EPA drinking-water maximum contaminant limit — 10 µg/L. Applies to public systems; private wells are not covered.

What this is — and isn't. These are two exposures estimated for the same place. This page does not claim one causes the other, does not combine them into a single risk number, and does not link either to any health outcome. It reports where both figures are elevated together, and nothing more.

Minnesota ZIP codes where both are elevated

The Minnesota ZIP codes (ZCTAs) that rank among the highest 10% of US ZIP codes for both modeled exposures. The ranking is national; this list is Minnesota only. How each area reads depends on whether its modeled radon actually crosses the 4 pCi/L action level — see the two labels below.

Above action levelmodeled radon crosses 4 pCi/L — the federal-reference sentence rendersElevated (top 10% in the US)in the top 10% of US ZIP codes but below 4 pCi/L — reads as a ranking, not the 4 pCi/L sentence
  • 56116in Beaver CreekAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56138in HillsAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56150in LakefieldAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56156in LuverneAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56277in OliviaAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56167in Round LakeAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56171in SherburnAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56172in SlaytonAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56173in SteenAbove action level

    USGS models a high likelihood that groundwater arsenic here exceeds 10 µg/L — the level EPA sets as the limit for public water systems — and this area's modeled radon runs above EPA's 4 pCi/L action level.

  • 56111in AlphaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56010in AmboyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55307in ArlingtonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56209in AtwaterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56211in BeardsleyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56312in BelgradeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56212in BellinghamElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56517in BeltramiElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56214in BelviewElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56118in Bingham LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55310in Bird IslandElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56216in BlomkestElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56013in Blue EarthElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56218in BoydElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56119in BrewsterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56014in BricelynElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55312in BrowntonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55314in Buffalo LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56120in ButterfieldElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56220in CanbyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56121in CeylonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56634in ClearbrookElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56224in ClementsElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56523in ClimaxElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56225in ClintonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56019in ComfreyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56228in CosmosElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56021in CourtlandElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56716in CrookstonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56231in DanversElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56232in DawsonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56271in De GraffElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56023in DelavanElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56236in DumontElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56127in DunnellElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56025in EastonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56237in EchoElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55329in Eden ValleyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56531in Elbow LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56533in ElizabethElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56027in ElmoreElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55332in FairfaxElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56031in FairmontElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56536in FeltonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56723in FisherElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55333in FranklinElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56131in FuldaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56132in GarvinElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55334in GaylordElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55335in GibbonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55336in GlencoeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56240in GracevilleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56039in GranadaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55338in Green IsleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56243in Grove CityElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55339in HamburgElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56041in HanskaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56134in HardwickElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55342in HectorElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56137in Heron LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56249in HollowayElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56141in IonaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56143in JacksonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56048in JanesvilleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56145in JeffersElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56146in KanaranziElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56251in KandiyohiElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56147in KennethElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56252in KerkhovenElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56051in KiesterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56054in LafayetteElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56055in Lake CrystalElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56253in Lake LillianElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56554in Lake ParkElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56151in Lake WilsonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56152in LambertonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56057in Le CenterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56058in Le SueurElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55354in Lester PrairieElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56255in LucanElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56062in MadeliaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56256in MadisonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56158in MagnoliaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56001in MankatoElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56065in MapletonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56257in MariettaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56263in MilroyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56068in Minnesota LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56069in MontgomeryElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56560in MoorheadElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56266in MorganElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56270in MortonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56159in Mountain LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55367in New GermanyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56273in New LondonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56072in New RichlandElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56073in New UlmElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56160in OdinElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56161in OkabenaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56162in OrmsbyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56278in OrtonvilleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56078in PembertonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56279in PennockElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56574in PerleyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55370in PlatoElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56280in PorterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56281in PrinsburgElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56282in RaymondElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56283in Redwood FallsElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56284in RenvilleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56166in RevereElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56579in RothsayElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56580in SabinElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56285in Sacred HeartElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56083in SanbornElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55381in Silver LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56085in Sleepy EyeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56288in SpicerElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56087in SpringfieldElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56081in St. JamesElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56757in StephenElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55385in StewartElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56174in StordenElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56291in TauntonElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56583in TintahElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56175in TracyElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56176in TrimontElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56088in TrumanElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56090in Vernon CenterElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56292in VestaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56293in WabassoElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56091in WaldorfElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56180in Walnut GroveElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56294in WandaElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56762in WarrenElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56096in WatervilleElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55389in WatkinsElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56181in WelcomeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56097in WellsElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56183in WestbrookElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56201in WillmarElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56101in WindomElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56098in WinnebagoElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 55396in WinthropElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

  • 56297in Wood LakeElevated (top 10% in the US)

    This area ranks among the highest 10% of US ZIP codes for both modeled radon and modeled groundwater arsenic.

Coverage & how to read this

Modeled, not measured. Indoor radon uses the Li national ZCTA-level model; groundwater arsenic uses the USGS private-well probability model. Neither is a reading from your home or tap. A ZIP with an unobservable leg is shown as not measured, never as "not impacted." Both references are federal: radon's 4 pCi/L is an action level (a recommendation to act), arsenic's 10 µg/L is the maximum contaminant limit EPA sets for public water systems. A ZIP reaches this list by ranking among the highest 10% of US ZIP codes for each exposure — the ranking is national, and this list is Minnesota only. Read the full combined-exposure methodology →

Each ZIP links to its full ZipVitals page. Minnesota only — the national list is on the explainer page.