ANSI/AARSTMeasurement Standards
What is AARST?
AARST is the American Association of Radon Scientists and Technologists, a non-profit organization. AARST develops the standards and practices used by radon testers and mitigators throughout the United States.
Who Needs AARST Radon Testing?
AARST standards are used by several federal agencies, including the Department of Housing and Urban Development. AARST is the gold standard for deciding whether a building needs radon mitigation. Due to its widespread adoption, AARST-compliant radon testing is required for many different federal loans.
Standards
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100% of ground contact residential and non-residential occupied locations must be tested, Non-residential occupied locations would include general common areas like offices, gyms, mailrooms, etc
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100% of units and locations above untested areas. For example, a residential unit above a parking garage, basement, or crawlspace
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At least 10% of residential units on every floor above the 1st tested floor
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Quality control measures to ensure accurate testing
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Duplicates: Two devices will be placed in at least 10% of tested units/locations​
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Blanks: Two devices will be placed in some units, one active device and one inactive blank.
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AARSTs full standards can be found on their website by clicking below​
