Effective 4 November 2026.
General information only
Everything on Radon Handbook (radonhandbook.com) is general information, published to help readers understand radon in US homes. It is not medical, engineering or legal advice, and it does not take your own health, home, location or circumstances into account. EPA, your state radon office or a certified radon professional decides what applies to your home.
Health
Nothing on this site is medical advice, and nothing here can diagnose, rule out or treat any condition. Talk to a doctor about symptoms or health worries, and tell them if you smoke or have lived with high radon levels. Don’t delay seeing a doctor because of something you read here. In an emergency, call 911.
Test results and levels
Our pages and tools describe what EPA says to do next for a number. They do not judge your home, and we never call a radon level safe. A short test can’t tell you your year-round average, and a zone map or a neighbor’s result can’t tell you your home’s level at all. A test is the way to know.
Rules vary by state
Radon rules on testing, disclosure, licensing and rentals differ by state and can change. Federal agencies and lenders change their requirements too. Notes on real estate, leases, loans and disclosure are general and are not legal advice. Check with your state radon office, and with a real estate attorney or your lender if a sale, lease or loan depends on the answer.
Estimates only
Every cost on this site is an estimate. It is not a quote, a bid, a guarantee or a judgment on whether a price is right. Our figures are built from public data and stated assumptions, as our how we check page explains. Your real cost depends on your home, your soil, your foundation, your region and your state’s rules. Test kit offers, grants and electricity prices are dated, and any of them may have changed.
We do no testing or installation
Radon Handbook tests no homes, installs no systems and sells nothing. We have not seen your home, your report or your quote. EPA does not certify radon professionals itself. It points readers to privately run national programs and state processes, so check a professional’s credential and your state’s rules before work starts. Published figures and maker specifications we cite come from others, and they remain those sources’ claims.
Safety
Fans, wiring and pipes run through your home. Nothing on this site is an instruction to do electrical work, and some states require a licensed mitigator for radon work. Don’t switch off a radon fan or block its pipe to stop a noise. Ask a certified professional to look at it.
Calculators
Calculators give estimates based on what you enter and on the figures and assumptions they show. They are not quotes, guarantees, or design, sizing, code or safety sign-offs. They print numbers only, so read the notes on the page around them.
Accuracy
Pages are checked against the sources they cite, but no check catches everything. Rules, prices and programs change, sometimes quickly, so a fact may be out of date by the time you read it. Check important details with the original source before you rely on them.
How our content is made
Every page is fact-checked against its sources before it is published. Pages appear under the Radon Handbook name. Our editorial policy explains the process.
Advertising and independence
Radon Handbook is funded by display advertising. Advertisers have no say over what we publish, and an ad on a page is not an endorsement. We use no affiliate links, accept no paid placements, sell no leads, give no quotes and make no referrals. Names of companies, products, publishers and agencies are used only to identify them, and we are not affiliated with them.
External links
We link to sources and other websites so you can check what we say. We do not control those sites and are not responsible for their content.
Questions and corrections
If you think something is wrong, email contact@radonhandbook.com with the page address and a source, and we will look at it. See also our corrections page and terms of use.