Mandatory Radon Testing Requirement for Large BuildingsThe 1999 legislature amended the mandatory radon testing requirement to require it only in the select counties show in the map below. For more guidance on the mandatory radon testing requirements contact the radon and indoor air quality program. Radon testing is required in the yellow shaded counties, while those counties shaded green are currently exempt. Return to Mandatory Testing Overview > Are You Required To Test Your Facility For Radon? - ADA Text Equivalent of Map
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