How to test your home for radon—and what the result means

Choose the test that fits the decision

Short-term and long-term tests answer different timing needs. The device instructions determine how long the test must remain in place, and real-estate transactions may call for a certified testing professional and an approved laboratory. Use the current NYSDOH instructions for the kind of decision you are making.

New York homeowners can currently order a test from NYSDOH. The state page lists the current price and explains what the kit includes; use the official order form rather than relying on an old price quoted elsewhere.

Set up the test carefully

• Follow every instruction supplied with the device
• Use the lowest level of the home that could be occupied regularly
• Keep the device away from drafts, high heat, humidity and places where it could be disturbed
• Maintain the closed-house conditions required for a short-term test
• Record the start and stop times and return the device promptly when instructed

Read the number in context

NYSDOH recommends fixing a home when radon test results show 4 pCi/L or higher, and it says homeowners may also want to consider fixing between 2 and 4 pCi/L. The result applies to the tested home and conditions—not to every property in the ZIP code or county.

If the result or testing conditions are uncertain, follow current confirmation guidance before making a final decision. Keep the laboratory report, device type, placement and test dates for the professional who discusses the property with you.

Move from a confirmed result to mitigation

A confirmed elevated result is the starting point for a property-specific mitigation discussion. Foundation sections, finished space, sump openings, access and vent routing can all affect the proposed system.

After mitigation work, follow-up testing is used to check performance. Ask the independent provider who will arrange it, when it should occur and what documentation you will receive.