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Combined exposures · In-home geology

Radon and arsenic in Ohio homes

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

OhioData release 2026Modeled inputs

Across parts of Ohio, 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.

Ohio ZIP codes where both are elevated

The Ohio ZIP codes (ZCTAs) that rank among the highest 10% of US ZIP codes for both modeled exposures. The ranking is national; this list is Ohio 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
  • 43311in BellefontaineAbove 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.

  • 43023in GranvilleAbove 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.

  • 44904in LexingtonAbove 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.

  • 44903in MansfieldAbove 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.

  • 43078in UrbanaAbove 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.

  • 45385in XeniaAbove 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.

  • 43001in AlexandriaElevated (top 10% in the US)

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

  • 45302in AnnaElevated (top 10% in the US)

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

  • 45303in AnsoniaElevated (top 10% in the US)

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

  • 45304in ArcanumElevated (top 10% in the US)

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

  • 44807in AtticaElevated (top 10% in the US)

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

  • 45306in BotkinsElevated (top 10% in the US)

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

  • 45308in BradfordElevated (top 10% in the US)

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

  • 43107in BremenElevated (top 10% in the US)

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

  • 45309in BrookvilleElevated (top 10% in the US)

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

  • 44820in BucyrusElevated (top 10% in the US)

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

  • 45312in CasstownElevated (top 10% in the US)

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

  • 45317in ConoverElevated (top 10% in the US)

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

  • 45318in CovingtonElevated (top 10% in the US)

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

  • 44827in CrestlineElevated (top 10% in the US)

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

  • 43013in CrotonElevated (top 10% in the US)

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

  • 43318in 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.

  • 43518in EdonElevated (top 10% in the US)

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

  • 45326in FletcherElevated (top 10% in the US)

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

  • 45845in Fort LoramieElevated (top 10% in the US)

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

  • 44833in GalionElevated (top 10% in the US)

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

  • 45331in GreenvilleElevated (top 10% in the US)

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

  • 43025in HebronElevated (top 10% in the US)

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

  • 45334in Jackson 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.

  • 45335in JamestownElevated (top 10% in the US)

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

  • 43031in JohnstownElevated (top 10% in the US)

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

  • 45337in LauraElevated (top 10% in the US)

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

  • 45135in LeesburgElevated (top 10% in the US)

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

  • 45338in LewisburgElevated (top 10% in the US)

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

  • 44905in MansfieldElevated (top 10% in the US)

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

  • 44906in MansfieldElevated (top 10% in the US)

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

  • 43334in MarengoElevated (top 10% in the US)

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

  • 45860in Maria SteinElevated (top 10% in the US)

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

  • 43046in MillersportElevated (top 10% in the US)

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

  • 45865in MinsterElevated (top 10% in the US)

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

  • 44847in MonroevilleElevated (top 10% in the US)

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

  • 43543in MontpelierElevated (top 10% in the US)

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

  • 43338in Mount GileadElevated (top 10% in the US)

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

  • 45346in New 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.

  • 45347in New ParisElevated (top 10% in the US)

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

  • 44854in New WashingtonElevated (top 10% in the US)

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

  • 45356in PiquaElevated (top 10% in the US)

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

  • 45359in Pleasant HillElevated (top 10% in the US)

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

  • 43343in QuincyElevated (top 10% in the US)

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

  • 45363in RussiaElevated (top 10% in the US)

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

  • 44875in ShelbyElevated (top 10% in the US)

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

  • 44878in ShilohElevated (top 10% in the US)

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

  • 45365in SidneyElevated (top 10% in the US)

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

  • 45368in South CharlestonElevated (top 10% in the US)

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

  • 45369in South ViennaElevated (top 10% in the US)

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

  • 43072in St. ParisElevated (top 10% in the US)

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

  • 43157in ThurstonElevated (top 10% in the US)

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

  • 45371in Tipp 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.

  • 44887in TiroElevated (top 10% in the US)

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

  • 45373in TroyElevated (top 10% in the US)

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

  • 45380in VersaillesElevated (top 10% in the US)

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

  • 45383in West MiltonElevated (top 10% in the US)

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

  • 45177in WilmingtonElevated (top 10% in the US)

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

  • 45388in YorkshireElevated (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 Ohio only. Read the full combined-exposure methodology →

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