RadonScout is an independent directory of state-credentialed radon testing and mitigation professionals — currently 658 companies across 4 states. This page explains how listings are compiled and verified, how (and when) we publish pricing, and how to reach us. Each state's own sourcing detail — which roster, and how current it is — is cited on that state's own listing pages, since that's a fact specific to that state, not a general rule.
Every listing starts from a state's own official radon credential rosters — the state's own lists of who currently holds an active radon mitigation or measurement credential. From there, each company is cross-checked against its own website, Google Places, and Facebook (when Google Places had no result), to confirm the business is real, reachable, and that its listed phone number and site actually belong to it.
Want to check a credential yourself? See how to check a radon contractor's license. This confirms a business is real, currently credentialed, and reachable — it is not an endorsement of workmanship. RadonScout doesn't inspect completed work and has no basis to rate how well a contractor does the job itself.
Three tiers appear on each city page, labeled rather than hidden:
We only publish a price when there are at least 5 verified paid-job prices from at least 3 different contractors in the same metro, and only from sources where a customer describes a completed job and states what they paid — not a contractor's advertised "starting at" quote. Most metros don't clear that bar yet, and we don't show a price for those. We'd rather publish nothing than round a thin sample into a number that sounds more confident than it is. See every metro's current count on the radon mitigation cost guide. Homeowners can also send us what they paid through a form on that page. Those submissions are reviewed first and, if they hold up, shown as a separate "homeowner-reported, not verified" count. They never count toward a published median.
Every contractor page answers the questions people ask before hiring, using only what the records show: whether the business is licensed (its state credential numbers and the roster date), whether it tests, mitigates or both, the cities it names on its own website, and any individual prices we hold. It never shows ratings or reviews, because RadonScout doesn't inspect completed work.
Some data we collect ourselves because no one else publishes it in one place. The Iowa school radon tracker checks what Iowa's 25 largest school districts have posted about radon testing on their own websites, with the date each district was checked. The radon mitigation cost guide shows, metro by metro, how many verified paid-job prices we have, and publishes a cost only once a metro clears the 5-from-3 bar above.
Each listing cites the specific state credential roster (and its pull date) it came from — see that date directly on the listing. We re-pull rosters and recheck contact details periodically, and the whole site is regenerated and redeployed whenever the underlying data changes. We don't yet commit to a fixed public recheck schedule; if a listing looks stale, email us and we'll check it.
Typing a ZIP code into the homepage search looks it up live through a free public postal-code service (zippopotam.us, built on GeoNames data) to find its city and state, then matches that against our own already-verified city pages — the same match a typed city name gets. We never guess which city “probably” covers a ZIP: if we don't have a page for the exact city your ZIP resolves to, the search says so and points you to nearby pages instead of silently routing you somewhere we haven't verified.
RadonScout doesn't accept payment from any contractor to be listed, ranked higher, or featured. Every listing appears because it matched a state credential record — not because of any payment. If that ever changes, it will be disclosed on this page.
RadonScout is a member of the Airthings affiliate program. On a few research pages — the school radon pages and the radon test results guide, where a reader is often deciding whether to test or retest their own home — we show a box linking to radon monitors from Airthings, with a discount code. If you buy through that link or code, RadonScout earns a commission; it doesn't add to what you pay. Every one of those boxes is labeled as an affiliate link before the link itself. Affiliate boxes never appear on city or contractor listing pages, and they have no effect on which contractors are listed or in what order — those still come only from state credential records.
Spot an error, run a credentialed radon business that isn't listed, or working on a story that touches this data? Reach out: matt@radonscout.com.