Ten guides that answer the questions people actually ask about radon: what the EPA zones mean, how to test, how mitigation works, what to disclose when selling, and how bad the risk really is. Each one cites the EPA, CDC, and peer-reviewed studies it draws from, so you can follow any claim back to its source.
Zone 1, 2, and 3 defined directly from EPA-402-R-93-071: what the classification predicts about indoor levels, what it doesn't, and when state data overrides the federal map.
2–7 day kits vs. 90+ day kits. Trade-offs, the EPA's recommended protocol, when to escalate, and how to read the result against the action level.
The dominant residential mitigation technique, pulled straight from EPA-402-K-10-005 and ANSI/AARST SGM-SF-2017: fan sizing, piping, exhaust placement, monitoring.
The counties with the highest published indoor radon averages, the geology that drives them, and what residents should do differently.
The separate exposure pathway through private wells in granitic terrain. How to test, what 300 vs. 4,000 pCi/L means, and what an aeration unit costs.
EPA-402-K-13-002 in plain English: what disclosure looks like, who pays for mitigation, how to time the work, and how to price the negotiation.
Table A-1 of EPA-402-R-03-003 decoded: lifetime deaths per 1,000 by exposure level, the BEIR VI dose-response, and the Iowa case-control evidence.
How to test correctly: kit type, placement, closed-house conditions, season, depth in the home, and how to interpret the lab result.
How the soil-gas pathway changes with floor level, ANSI/AARST MS-PMD-2014 measurement protocol, and what a tenant or HOA can actually do.
Why structural changes can void prior test results, the EPA's retest cadence, and the specific scenarios that warrant a fresh measurement.
The guides stay free. The $15 PDF compresses the county-relevant fraction of them into one printable page.
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