Ten primary-source-cited guides covering the EPA's zone map, testing, mitigation systems, real-estate disclosure, and the actual epidemiology behind the EPA's risk numbers. Every claim sourced to a federal publication, peer-reviewed paper, or standards document.
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 are free. The 6-page PDF turns it all into one printable page for your county.
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