Village, Winnebago County, Illinois
Radon Testing in Machesney Park, IL
Updated
IEMA has 391 radon test results on record for Machesney Park. 31.5% came back at or above the EPA's action level of 4.0 pCi/L. That is below the Winnebago County rate of 36.7%, though still a real share of homes. A standard test runs $150 to $300. The only way to know about one specific house is to test it.
Machesney Park incorporated in 1981 and grew outward without the platted subdivisions older towns have. It's a mix of single-family homes and a significant rental inventory, and radon testing serves both.
What IEMA's radon test records show
Look past the median to the tail: 0% of Machesney Park tests were 20 pCi/L or more, five times the action level. The top reading on record is 19 pCi/L. The average result in Machesney Park is 3.45 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+ | |
|---|---|---|---|---|---|
| Machesney Park | 391 | 3.45 | 31.5% | 3.6% | 0% |
| Winnebago County | 7,642 | 4.23 | 36.7% | 7.9% | 1.1% |
Source: IEMA radon test records, Illinois Emergency Management Agency.
The ground under Machesney Park
North-central Illinois, where Winnebago County sits, is built on Ordovician and Silurian dolomite and limestone, covered by glacial till and outwash from the last Ice Age. That bedrock and cover combination is why the EPA rates the whole county Radon Zone 1, its highest-potential classification, with predicted average indoor screening levels at or above 4.0 pCi/L.
Housing in Machesney Park
Census Bureau, American Community Survey 2020 to 2024 5-year estimates.
| Homes (housing units) | 9,118 | 125,002 in Winnebago County |
| Median year built | 1978 | 1971 countywide |
| Built before 1980 | 65.4% | 74% countywide |
| Attached (rowhome, townhouse) | 1.2% | 4.3% countywide |
| Mobile homes | 0.5% | 1.3% countywide |
| Renter-occupied | 20.4% | 34.1% countywide |
Most of the housing in Machesney Park went up between the 1940s and the 1970s (65.4% was built before 1980, median year 1978). That era mostly means poured or block basements, which is the standard layout for a sub-slab test and, if needed, a sub-slab mitigation system.
Areas we cover in Machesney Park
- North Park
- Silo Ridge
- The North 2nd Street corridor
- Rentals along Zenith Parkway
Not on the list? The whole of Machesney Park is covered. These are just the areas that come up most.
What we do in Machesney Park
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 Machesney Park?
Yes. Out of 391 IEMA-recorded tests taken in Machesney Park, 31.5% 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 Machesney Park?
19 pCi/L, out of 391 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.
We're closing on a house in Machesney Park soon. Is there time to test?
In most cases, yes. Scheduled early in the inspection period, a short-term test (a few days to about a week) has time to come back before you need to decide anything. Details on our real estate radon testing page.
Nearby
Loves Park (31.1% of tests at 4+ pCi/L), Rockford (36.8% of tests at 4+ pCi/L), Roscoe (29.1% of tests at 4+ pCi/L), Harlem Township.
Need radon testing booked in Machesney Park?
Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.