Frequent questions.

What does the $9 PDF actually contain?

A 6-page county-specific dossier covering: your EPA Radon Zone (1, 2, or 3) from EPA-402-R-93-071; your county's expected indoor average pCi/L from the relevant state survey; your home's estimated likelihood of testing above the 4.0 pCi/L EPA action level; AARST-aligned mitigation cost ranges from EPA-402-K-10-005; the EPA's lifetime lung-cancer risk numbers from Table A-1 of EPA-402-R-03-003; and a 14-day testing plan. Every figure is dated and sourced.

How does this differ from the free EPA radon-zones lookup?

The free EPA Map of Radon Zones tells you your county's zone (1, 2, or 3). It does not tell you your county's expected indoor average, your home's estimated likelihood of testing above the action level, mitigation cost ranges, the EPA's lifetime risk numbers for your concentration, or a testing plan.

We compile all of that into one printable page you can hand to an inspector, a contractor, or a buyer's agent without having to explain anything. We also reconcile the 1993 EPA classification with the more recent state-level surveys where they exist, so the figure reflects current evidence rather than a 32-year-old map alone.

Is the data accurate?

Every number in the dossier traces to a federal publication, a peer-reviewed paper, or a state health department survey, all named in the report and on our sources page. The EPA Map of Radon Zones was published in 1993 and has not been re-issued; where a state has published more recent county-level data, we override the EPA value with the state value and footnote the override.

Derived metrics (such as your home's estimated likelihood of testing above 4 pCi/L) are explicitly marked as population-level statistical estimates, not measurements of your home. Our calibration check on every release is that the per-county distributions average within ±15% of the published state-wide screening mean.

Is this a measurement of my home?

No. The only way to know your home's radon concentration is to test the house with a short-term ($15–$30) or long-term ($25–$45) test kit. House-to-house variance is enormous; two homes on the same street can differ by an order of magnitude.

Our dossier is a population-level statistical estimate for the county you specify: useful for risk triage, for prioritizing whether to test now, and for benchmarking a test result, but not a substitute for an actual in-home measurement. See our DIY testing guide for how to test.

What is the EPA action level of 4.0 pCi/L?

4.0 pCi/L (picocuries per liter) is the indoor radon concentration at or above which the EPA recommends mitigation, per the Citizen's Guide to Radon (EPA-402-K-12-002). The EPA also notes that there is no safe level of radon exposure (risk continues below 4.0 pCi/L) and suggests considering mitigation between 2 and 4 pCi/L.

The 4.0 threshold is a practical action level, not a safety threshold. The World Health Organization recommends a more conservative reference level of 2.7 pCi/L (100 Bq/m³).

How long does the PDF take to arrive?

Under a minute, typically. The PDF is generated on demand from the county data on file and emailed to the address you provide at checkout. You also get a download link on the success page in case the email is delayed in transit.

What if my county isn't covered?

We cover every US county on the EPA Map of Radon Zones: all 3,143 counties and county-equivalents in the 50 states plus DC. We do not cover US territories (Puerto Rico, USVI, Guam, etc.) because the EPA Map of Radon Zones does not classify them. If we cannot generate a report for the address you provide, the purchase is refunded automatically.

Do you sell test kits or mitigation services?

No. We sell the $9 PDF and nothing else. We do not sell test kits. We do not provide mitigation services. We do not take referral fees, commissions, or affiliate revenue from any mitigator, test-kit vendor, real-estate agent, or home inspector.

To find a certified mitigation professional, use the NRPP (aarst-nrpp.com) or NRSB (nrsb.org) certification directories.

Are you affiliated with the EPA?

No. RadonZoneReport is independent and is not affiliated with, endorsed by, or sponsored by the US Environmental Protection Agency, AARST, NRPP, NRSB, the American Lung Association, or any state health department. We cite their public publications. They do not review or approve our content.

Can the report be used as a real-estate disclosure document?

No. Real-estate disclosures require an actual radon test of the specific property, typically performed by a certified measurement professional per ANSI/AARST MAH-2019 or equivalent.

Our dossier is educational background on the county-level radon risk environment; it is not a substitute for a property-specific radon measurement, nor for the legal disclosure documents your state requires. See our selling-with-high-radon guide and the EPA's Home Buyer's and Seller's Guide to Radon (EPA-402-K-13-002) for the disclosure framework.

How often should I retest my home?

Per the EPA Citizen's Guide (EPA-402-K-12-002): test every two years if your initial result was below 4 pCi/L, and always retest after a basement remodel, any major foundation work, a change in HVAC system, or the installation or modification of a mitigation system. New occupants should consider testing on move-in regardless of prior results. See our retest-after-renovation guide for detail.

What about radon in my well water?

Well-water radon is a separate exposure pathway from soil-gas radon, and is not captured by the EPA Map of Radon Zones (which addresses soil gas only). If you are on a private well drawing from granitic or metamorphic bedrock, well-water radon may add to your indoor exposure when water is aerated (showers, dishwashers, washing machines).

See our radon-in-well-water guide for the testing and treatment approach.

Do you cover apartments and condos?

Yes, with the caveat that above-grade units (third floor and higher in a multi-story building) generally have much lower soil-gas radon exposure than ground-floor or basement units. The county zone classification still appears on the dossier, but the practical risk profile depends heavily on your unit's floor and the building's HVAC pressurization. See our apartments-and-condos guide for detail.

What is your refund policy?

If we cannot generate a report for the address you provide (for example, an invalid ZIP, a US territory we do not cover, or a data error), the purchase is refunded automatically.

For any other refund request, email [email protected] within 30 days of purchase. Because the product is a digital PDF that is delivered immediately, we do not refund post-delivery requests except for the cases above or where we have made a factual error in the report.

How do I report a factual error?

Email [email protected] with the specific claim and the source you believe it contradicts. We will respond within five business days. Confirmed corrections are posted to our public corrections log with the date, the previous claim, the corrected claim, and the source that drove the change.