Village, Winnebago County, Illinois
Radon Testing in Rockton, IL
Updated
IEMA has 521 radon test results on record for Rockton. 39.2% came back at or above the EPA's action level of 4.0 pCi/L. That is close to the Winnebago County rate of 36.7%. A standard test runs $150 to $300. The only way to know about one specific house is to test it.
Rockton sits at the north end of the service area near the Wisconsin line, a mix of older village-centre properties and newer subdivision housing. Testing is usually scheduled a few days ahead rather than same-day out here.
What IEMA's radon test records show
Look past the median to the tail: 1.3% of Rockton tests were 20 pCi/L or more, five times the action level. The top reading on record is 45 pCi/L. The average result in Rockton is 4.43 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+ | |
|---|---|---|---|---|---|
| Rockton | 521 | 4.43 | 39.2% | 9.4% | 1.3% |
| Winnebago County | 7,642 | 4.23 | 36.7% | 7.9% | 1.1% |
Source: IEMA radon test records, Illinois Emergency Management Agency.
The ground under Rockton
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 Rockton
Census Bureau, American Community Survey 2020 to 2024 5-year estimates.
| Homes (housing units) | 3,063 | 125,002 in Winnebago County |
| Median year built | 1996 | 1971 countywide |
| Built before 1980 | 37.6% | 74% countywide |
| Attached (rowhome, townhouse) | 11.6% | 4.3% countywide |
| Mobile homes | 0.6% | 1.3% countywide |
| Renter-occupied | 19% | 34.1% countywide |
41.2% of the homes here were built in 2000 or later, one of the higher shares in the county. New construction is not automatically low-radon: a tight, modern house can hold the gas in as well as it holds heat in, and testing after the home is closed up is the only way to know. See our new construction radon testing page. 11.6% of Rockton's housing is attached, above the 4.3% countywide share. Sharing a wall with a neighbor does not change your own exposure, so a neighbor's result is not a substitute for your own test.
Areas we cover in Rockton
- Wingate
- Al J D'Agnolo Garden Apartments
- Village-centre properties off Blackhawk Boulevard
Not on the list? The whole of Rockton is covered. These are just the areas that come up most.
What we do in Rockton
Radon testing, Radon mitigation, Buying or selling a home, and New construction.
Full pricing, the complete service menu, and the rest of the service area are on the radon testing in Rockford, IL homepage.
Common questions
Is radon a problem in Rockton?
Yes. Out of 521 IEMA-recorded tests taken in Rockton, 39.2% 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 Rockton?
45 pCi/L, out of 521 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.
Does a new home in Rockton still need radon testing?
Yes, and it matters here: 41.2% of Rockton's homes went up in 2000 or later. New construction sits on the same ground as an old house, so age alone doesn't tell you the number. Test after the house is closed up.
Nearby
Roscoe (29.1% of tests at 4+ pCi/L), South Beloit (40.7% of tests at 4+ pCi/L), Winnebago (50.6% of tests at 4+ pCi/L), Shirland Township, Burritt Township.
Need radon testing booked in Rockton?
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