Query Illinois IEMA's Radon Active Licensee Listing to verify a measurement or mitigation licensee
domain: public.iema.state.il.us (government) · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Load the base listing at public.iema.state.il.us/Radon/Home/LicenseIndex, which returns all currently active IL radon licensees by default.
Filter using GET query parameters, e.g. ?licenseTypeID={id}&countyID={id}&employer={id}&page=1&pageSize=20 — licenseTypeID selects Measurement Professional/Technician or Mitigation Professional/Technician, countyID filters by IL county.
First parse the page's own dropdown HTML to map licenseTypeID/countyID/employer option labels to their integer ids, since these are opaque and undocumented outside the page markup.
Sort with &sort=licensenumber or &sort=name_d, and page through with &page=N given the reported total record count.
Check the 'Associated Professional' column for technicians, which names the supervising licensed professional required under IL rules.
Known gotchas
This is a server-rendered HTML table (ASP.NET MVC), not a JSON API — plan for an HTML scraper/parser, not a REST client.
licenseTypeID and countyID values are only exposed as dropdown option values in the page HTML — don't guess a numbering scheme.
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