Methodology

Every number on this site is either sourced or labelled as an estimate. This page explains where each class of number comes from and what it cannot tell you.

1. Installed cost bands

The installed bands come first from the EPA's published figures — the Consumer's Guide to Radon Reduction (EPA 402/K-10/002) states $800–$2,500 for a fan-based system in an existing home. Where a system type has no EPA figure (for example sub-membrane or block-wall), we state a band only when at least two state radon program pages or the EPA's cooperative partners (such as sosradon.org) publish one, and the page names them. The EPA figures are from January 2010 and remain the last official EPA statement; where inflation matters, we say so rather than silently rebasing.

2. Running-cost math

Fan energy is computed, not copied: watts × 8.76 = kWh per year; kWh × the latest EIA residential electricity price = dollars per year. The watts and the price are each named on the page, so the arithmetic can be re-run for your own rate. At the August 2026 EIA average of 18.16 cents/kWh, an 80-watt fan costs about $127 a year.

3. EPA Zone data

Zone definitions follow the current EPA map documentation: Zone 1 counties have a predicted average indoor radon above 4 pCi/L, Zone 2 between 2 and 4 pCi/L, Zone 3 below 2 pCi/L. The zones are screening predictions from geology, aerial radioactivity survey data and indoor measurements — they are not a test of any individual house, and we never present them as one.

4. Testing prices

Kit prices come from the programs that actually sell them at scale (including EPA's cooperative partner at sosradon.org); professional measurement ranges come from state program and HUD-published ranges. A consumer monitor price is the street price of the hardware, not a measurement service.

5. What we have not done

We have not installed systems, measured houses or run a lab. Our pages aggregate, cite and explain published figures; they are not a substitute for a test of your own home or a bid from a certified mitigator.

6. Corrections

If a number here is wrong, emailcontact@radonlab.com with the page and the source. Corrections are made and dated, not quietly patched.