Resources
Radon resources
23 guides by topic, from learning what radon is to testing, fixing, a home sale and water, with 92 short answers and every state's radon program.
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Radon gas: what it is, where it comes from and how it gets indoors
Radon gas is a naturally occurring radioactive gas, with no color, smell or taste, that forms as uranium breaks down in rock, soil and water.
Read the guideFour steps
Learn, test, fix, find a pro
The guides follow the same four steps as the rest of the site.
Learn
Learn about radon
What radon is, where it comes from, how it gets indoors and what it does to health.45 guides, pages and answers in LearnTest
Testing for radon
How a radon test works, who can run one, and how to read the number it gives you.34 guides, pages and answers in TestFix
Fixing a high radon level
How a mitigation system brings a high level down, the fan that runs it, and what it costs.21 guides, pages and answers in FixFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.Find a professional
Learn
What radon is, where it comes from, how it gets indoors and what it does to health.
Test and fix
Guides to testing and fixing
How a test works and how to read it, then how a high level comes down.
Free radon map
See the predicted potential where you live
Open the map of EPA's predicted radon zones across the United States. A zone describes an area's potential, never a reading for one home.
Open the radon mapGuides by topic
Guides for your situation
A home sale, the years in a home you own or rent, and radon in water.
- Buying and selling
Radon when you buy or sell a home
Radon in a home sale: testing before closing, the inspection, disclosure and negotiation.
All 11 guides, pages and answers in Buying and selling - Owning and renting
Radon in the home you own or rent
Living with a home over the years: retests, a system to look after, and new builds.
All 11 guides, pages and answers in Owning and renting - Water
Radon in household water
Radon in well and household water: when it matters, how a water test works, and treatment.
All 7 guides, pages and answers in Water
Short answers
Popular questions
The most searched radon questions, each with its short answer first.
State programs
Your state's radon program
All 50 states and DC, with what each program offers and its verification status shown honestly.
Find your stateLocation Report
Put your place's radon data in one document
Choose a county, a city, a ZIP code or an address and preview its report, built from that place's real data. Area data, never a reading of a home.