How to test, short-term vs long-term kits, what a good test costs, and how to read your result against the EPA and WHO levels.
A plain-English breakdown of what radon test kits actually cost, from free state programs to charcoal canisters, alpha-track kits, and professional testing.
Read the guide →Step-by-step instructions for using a short-term charcoal radon test kit correctly, from closed-house conditions to mailing the sample to the lab.
Read the guide →Why new construction homes aren't automatically radon-free, when to test, and what to do if your RRNC-equipped home still reads above 4 pCi/L.
Read the guide →Charcoal canisters are the most common way to screen a home for radon: here is how they work, what they can and cannot tell you, and where to get one.
Read the guide →Charcoal canisters, alpha track film, and electronic monitors all measure radon differently. Here is how each type works and when to use one.
Read the guide →Step-by-step instructions for testing your basement for radon, including which test to choose, where to place it, and what to do with the results.
Read the guide →How to choose between continuous radon monitors and passive test kits, which devices work best, and what your readings actually mean.
Read the guide →Find out where US homeowners can get free or nearly free radon test kits, from state health department programs to January promotions and what to do when free kits run out.
Read the guide →EPA guidance on radon detector placement: which floor, which room, how high off the floor, and which spots to avoid so your test gives you an accurate reading.
Read the guide →Everything a US homeowner needs to buy, place, and mail back a DIY radon test kit, then read the results and know what action the EPA recommends.
Read the guide →If your home uses a private well, dissolved radon in the water can release into indoor air during showers and dishwashing. Here is how to test and what to do about it.
Read the guide →The EPA links radon to about 21,000 lung cancer deaths a year, and the only way to know your home's level is to test it.
Read the guide →An independent buyer's guide to radon test kits in 2026: free state kits first, then the best short-term, long-term, and digital monitor picks.
Read the guide →Learn exactly what your radon test results mean, when the EPA says you need to act, and what steps to take based on your specific reading.
Read the guide →A step by step guide to testing your home for radon: short-term kits, long-term tests, digital monitors, correct placement, and how to read your result.
Read the guide →Learn when to use a charcoal test kit versus an electronic radon monitor, and which type works for initial testing, home sales, or post-mitigation checks.
Read the guide →Learn which radon test fits your situation, how each type works, and what the EPA's two-test guidance actually means for your home.
Read the guide →What radon is, how it gets into a home, whether it is actually dangerous, and how worried you should really be.
Browse Radon Basics →How a sub-slab depressurization system actually works, what mitigation costs, and where DIY makes sense versus hiring a pro.
Browse Mitigation →Radon in real estate: testing during a sale, whether to buy a house that already has a system, and who pays for the fix.
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