City, Winnebago County, Illinois
Rockford Service Area
Updated
This page covers the Rockford neighborhoods and subdivisions we take testing jobs in. For pricing and the full service menu, see radon testing in Rockford, IL. More than 1 in 3 Winnebago County homes test at or above the EPA's 4.0 pCi/L action level, and a standard test runs $150 to $300.
Rockford is the largest market in Winnebago County, and radon testing here covers everything from pre-war homes near downtown to newer subdivisions on the north side. The house's age doesn't change the underlying risk: the geology beneath the whole area does.
What IEMA's radon test records show
Look past the median to the tail: 0.8% of Rockford tests were 20 pCi/L or more, five times the action level. The top reading on record is 66 pCi/L. The average result in Rockford is 4.1 pCi/L, against 4.23 for Winnebago County overall. IEMA's own dataset covers tests licensed measurement professionals submitted from 2003 through July 2019, keeping only the highest reading on record per address. That means it is not a random sample and not year-by-year, but it is the closest thing to primary local radon data that Illinois publishes.
| Tests | Avg pCi/L | 4+ pCi/L | 10+ | 20+ | |
|---|---|---|---|---|---|
| Rockford | 4,404 | 4.1 | 36.8% | 7% | 0.8% |
| Winnebago County | 7,642 | 4.23 | 36.7% | 7.9% | 1.1% |
Source: IEMA radon test records, Illinois Emergency Management Agency.
The ground under Rockford
Winnebago County sits in the Rock River valley of north-central Illinois. Its bedrock is dolomite and limestone left from the Ordovician and Silurian periods, buried under glacial till and outwash the last Ice Age left behind. The EPA places Winnebago County in Radon Zone 1, its highest-potential category: a predicted average indoor screening level at or above 4.0 pCi/L.
Housing in Rockford
Census Bureau, American Community Survey 2020 to 2024 5-year estimates.
| Homes (housing units) | 67,423 | 125,002 in Winnebago County |
| Median year built | 1963 | 1971 countywide |
| Built before 1980 | 83.5% | 74% countywide |
| Attached (rowhome, townhouse) | 4.5% | 4.3% countywide |
| Mobile homes | 0.6% | 1.3% countywide |
| Renter-occupied | 45.1% | 34.1% countywide |
22.4% of homes in Rockford were built before 1940, against 15.5% county-wide. Houses that old usually sit on stone or early block foundations with plenty of joints for soil gas to move through. That does not mean they cannot be tested and fixed, just that a mitigation contractor may need more than one suction point. With 45.1% of Rockford's housing renter-occupied, landlord testing questions come up often. There is no Illinois requirement to test a rental, but plenty of owners do it between tenants when the unit sits empty anyway.
Areas we cover in Rockford
- North Town Heights
- Mulford Ridge and Mulford Crest
- Spring Creek Hills
- Spring Lake Estates
- Skandia Hills
- Western Hills
- Briar Crest
- Emerson Estates
- Bellshire East
- Beverly Park
- Auburn Manor
- Boylan Terrace
- North Ridge
- Country Club Estates
- Edgebrook
- Alpine Crest
- Riverside and Riverside Glen
Not on the list? The whole of Rockford is covered. These are just the areas that come up most.
What we do in Rockford
Radon testing, Radon mitigation, Buying or selling a home, and New construction.
Common questions
Is radon a problem in Rockford?
Yes. Out of 4,404 IEMA-recorded tests taken in Rockford, 36.8% came in at 4.0 pCi/L or higher, the EPA's action level. That fits Winnebago County's overall Zone 1 rating, the agency's highest-potential class.
What is the highest radon reading on record near Rockford?
66 pCi/L, out of 4,404 IEMA-recorded tests. That is an outlier, not typical, but it shows why testing rather than guessing matters: neighboring houses can differ by a wide margin.
I rent in Rockford. Can I get my unit tested?
Nothing in Illinois law stops a tenant from asking for a radon test, and plenty of landlords in Rockford test between leases anyway, since an empty unit is the easiest time to do it.
Nearby
Loves Park (31.1% of tests at 4+ pCi/L), Machesney Park (31.5% of tests at 4+ pCi/L), Cherry Valley (50.2% of tests at 4+ pCi/L), Roscoe (29.1% of tests at 4+ pCi/L), Harlem Township.
Need radon testing booked in Rockford?
Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.