Radon mitigation across McHenry County

Who is licensed to do this work in McHenry 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 McHenry 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 McHenry County.
• IEMA’s printable mitigation licensee list for McHenry 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.

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 McHenry County, without the mythology

Northern Illinois’ long winters are, oddly, an asset for radon accuracy: closed-house conditions — the protocol short-term tests require — happen naturally for months. Results here follow the same house-by-house variability as everywhere in the region, under the same standards: EPA action recommendation at 4 pCi/L, consideration from 2 to 4, statewide IEMA-OHS licensing. On rural wells, radon dissolved in water is a separate, testable question.

Transactions here

County transactions range from corridor family moves to acreage sales, and Illinois disclosure law covers them identically: known radon information is shared, the pamphlet provided, responses negotiated. Winter closings deserve a local note — cold-season tests read “hot” more often because houses are properly closed up. Those are valid numbers to negotiate from, not artifacts to retest away in July.

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 McHenry

Published city pages: Crystal Lake, Algonquin, and Huntley. Territory coverage additionally routes Cary, Lake in the Hills, Marengo, McHenry, and Woodstock ZIP codes.

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