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Radon guides
All 25 Radon411 guides by topic: learn what radon is, test, fix, buy or sell, live with a home over the years, and water.
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Radon guides by topic
Six topics, each with its own page: its guides, its overview pages and its short answers.
Radon guides by topic: 1 of 6
The whole list
All 25 guides and every overview page, by topic
Learn about radon
- What is radon gas?17 min readWhere it comes from and how it gets indoors.
- Radon lung cancer risk22 min readWhat the evidence shows and what lowers it.
- Radon in homes17 min readHow it gets in, where it builds up and what to do about it.
- Radon facts16 min read5 facts about radon, the key statistics and the truth behind the myths.
- Radon symptoms20 min readWhat radon exposure does, and why there are no warning signs.
- What is radon?15 min readThe radon definition, and the terms on a radon test.
- Radon poisoning18 min readWhat radon gas exposure actually does, and what to do about it.
- Radon scam or real risk?15 min readWhat the evidence shows, and where to be careful.
- EPA radon guidance22 min readAction level, map and guides.
- Radon in granite17 min readCountertops, rock and testing.
- Radon element19 min readSymbol, atomic number and uses.
Testing for radon
- Radon inspection16 min readHow a professional radon test works, what it proves and whether it is worth it.
- High radon levels17 min readWhat counts as high and how to bring them down.
- Radon limits16 min readEPA's action level, WHO's reference level and what counts as acceptable.
- National Radon Action Month17 min readTest, fix and build.
- Radon Action Month checklist7 min readJanuary is National Radon Action Month, and the first thing on EPA's list for the month is to test your home.
- Radon certification15 min readHow to get certified.
- How to test for radonOverview pageWhich test to choose, how to place it, closed-house timing, how to read the result, and the mistakes that throw off a reading.
- What radon levels meanOverview pageA radon test result is a number in pCi/L. What that number means, why it varies, EPA's thresholds, and how to read your own result.
- Test in National Radon Action MonthOverview pageJanuary is when EPA tells people to test. Bring the county record to the test.
- What does radon testing cost?Overview pageWhat drives the price of a radon test, what a written quote should include, and how to compare quotes from different professionals.
Fixing a high radon level
- Radon remediation system23 min readWhat gets rid of radon, how reduction and abatement work, and what they cost.
- Radon fan23 min readHow a radon mitigation fan works, where it goes, what it costs to run and replace.
- How radon mitigation worksOverview pageHow mitigation systems reduce indoor radon, when to mitigate instead of retest, what a project involves, common mistakes, and how to confirm a system actually worked.
- Types of radon mitigation systemsOverview pageSub-slab, sump-based and crawlspace system designs explained, and how a professional decides which one a specific home needs.
- What a radon fan costs to runOverview pageWhat a radon fan costs to run each month and year, from state health department figures, with a calculator for your own fan and electricity price.
- What does radon mitigation cost?Overview pageWhat drives the price of a mitigation system, what a written quote should include, and how to compare quotes from different contractors.
Radon when you buy or sell a home
- Buying a house with radon16 min readTesting before closing, and when it is a deal breaker.
- Selling a house with radon16 min readTest before you list, fix it on your timeline, and show your work.
- Radon testing during a home inspection15 min readTiming, the tester, the report and the negotiation.
- Radon disclosure15 min readWhat sellers share, what buyers ask, and how to find your state's rule.
- State radon programsOverview pageEvery U.S. state and DC runs, or designates, a radon program. Each entry shows only what that program's own page stated when Radon411 read it, and the date it was read.
Radon in the home you own or rent
- Radon system20 min readLiving with a radon mitigation system, from the manometer to maintenance and retesting.
- Passive radon system19 min readHow radon-resistant construction works, whether it is enough, and how to make it active.
- Testing a new home for radonOverview pageWhy a new home still needs a radon test, when to test after move-in, and what to do if the result is elevated.
- Radon-resistant new constructionOverview pageWhat RRNC building techniques include, what they do and do not guarantee, why they cost less to build in than to retrofit, and what varies by state and local code.
Radon in household water
- Radon in waterOverview pageHow radon gets into water, who it affects most, how a water test differs from an air test, and how elevated water radon is treated.
- Well water and radonOverview pageWhy private wells are the main concern for waterborne radon, and what public water treatment changes about that risk.
- Water testing for radonOverview pageHow a water-specific radon test works, why it is different from an air test, and where to send a sample.
- Water treatment for radonOverview pageHow aeration and granular activated carbon systems reduce radon in water, and how they differ from soil-gas mitigation.