Radon mitigation across suburban Cook County

Who is licensed to do this work in Cook County

Illinois does not leave this to guesswork, and neither should you. IEMA-OHS licenses radon mitigation professionals for the whole state and publishes the active list itself — no account, no fee, no intermediary. It is the same list a search engine returns above the review sites, and it is the only list of Cook County mitigation supply that nobody paid to appear on.

• Search IEMA’s active licensee register — filter by licence type: mitigation and by service county or city to see who covers Cook County.
• IEMA’s printable mitigation licensee list for Cook County — the whole county on one page, useful if you want to work down it methodically.

Source: IEMA-OHS Radon Tracking System. Register locations last confirmed 2026-08-18. The register is live and the state’s; anything reprinted from it on this site carries the date it was last checked, and the register wins wherever the two disagree.

The 40 mitigation professionals on IEMA’s Cook County list

Reprinted from the state’s county print list, last checked 2026-09-07, in the register’s own order. The list is whoever has told IEMA they serve Cook County, and 5 of them are based outside Illinois. The licence number is the thing to quote back when you ask for a bid, and the thing to check on the register before you sign.

30 licensed mitigation technicians also appear on the Cook County list. They work under one of the professionals above and cannot take a job on their own, so they are counted here rather than listed. Where the phone column reads “on the register”, the address IEMA holds for that licensee is not plainly business premises, so neither it nor the number is reprinted here; the register link above carries both. Source: IEMA-OHS county print list, retrieved 2026-09-07. Nobody on it has any relationship with Radon Connect. A licensee who wants an entry corrected or removed can tell us, and it is actioned against the next weekly import.

What a listing does and does not tell you

• It shows who currently holds an Illinois mitigation licence — not who is good, insured, available, or priced fairly.
• A licence covers a person or business, not a specific job. Confirm the licence you were quoted by is the one doing your work.
• Measurement and mitigation are separate Illinois licences. The list linked here is the mitigation list.
• Nobody on it has any relationship with Radon Connect. We do not place, rank, endorse, or receive anything from the businesses Illinois licenses.

So the register narrows the field; it does not pick for you. Ask every business you shortlist for its licence number and check it yourself — that habit is your protection, and how Illinois radon licensing works, and how to verify a number walks through it. When the quotes arrive, compare them on the eight lines that actually differ rather than the total at the bottom.

Prefer not to work the list yourself? Tell us the reading and the postcode and we will check coverage before asking for a single contact detail — start a request, and the confirmation tells you exactly what happened to it, including when the answer is that nobody covers you yet.

Radon in Cook County, without the mythology

Attached and multifamily housing gives suburban Cook its distinctive radon texture: ground-contact units are where numbers matter most, per-unit systems are the norm in townhomes, and associations govern exterior routing. None of that changes the fundamentals — EPA’s action recommendation at 4 pCi/L, the 2–4 consideration band, IEMA-OHS statewide licensing — it just changes who signs which approval.

Transactions here

From competitive northwest-suburb bidding wars to southwest-corridor family moves, Illinois’ rules are constant: radon is a disclosure item; fixes are negotiated. Two suburban-Cook patterns worth naming: buyers who waived inspections to win a house should simply test right after closing, and condo buyers should read declarations early, because association consent — not technology — is usually the pacing item on attached-housing mitigation.

Before collecting numbers, what radon mitigation costs in general sets out the commonly quoted ranges by home type and the six factors that move a quote, and the mechanics of a mitigation system explains what those numbers buy — suction point, pipe, fan, manometer, and the verification retest.

City guides in this territory

Full coverage in Cook

Published city pages: Orland Park, Tinley Park, Arlington Heights, Palatine, and Schaumburg. Territory coverage additionally routes Des Plaines, Elk Grove Village, Hanover Park, Hoffman Estates, La Grange, Mount Prospect, Oak Forest, Oak Lawn, Palos Heights, Palos Hills, Palos Park, Rolling Meadows, and Streamwood ZIP codes. Chicago proper is not currently supported — the quote form will say so honestly for city ZIPs.

Not sure about your ZIP? The quote form resolves it instantly and honestly.

Suburban Chicagoland guides

• Radon Mitigation in Suburban Chicagoland
• Radon Testing in Suburban Chicagoland
• Radon Mitigation Cost in Suburban Chicagoland
• Failed Radon Test in Suburban Chicagoland
• Radon System Installation in Suburban Chicagoland