Where we work
Service area
Updated
Radon testing is available across Winnebago, Boone, and the northern part of Ogle County, Illinois, all three EPA Radon Zone 1 counties. Each town below links to its own page built from IEMA's own radon test records and Census housing data, not a find-and-replace description.
Winnebago County
Rockford
City · Rockford is the largest market in Winnebago County, and radon testing here covers everythi…
Loves Park
City · Loves Park sits just south of Machesney Park, with a mix of established subdivisions and a…
Machesney Park
Village · Machesney Park incorporated in 1981 and grew outward without the platted subdivisions olde…
Roscoe
Village · Roscoe sits north of Machesney Park along the Rock River, mostly newer subdivisions and la…
Rockton
Village · Rockton sits at the north end of the service area near the Wisconsin line, a mix of older …
South Beloit
City
Cherry Valley
Village
Winnebago
Village
Pecatonica
Village
Durand
Village
Burritt Township
Township · Burritt Township sits in the far northwest corner of Winnebago County, along the Wisconsin…
Harlem Township
Township · Harlem Township covers the built-up area directly north of Rockford, including most of Lov…
Harrison Township
Township · Harrison Township sits on Winnebago County's western edge, bordering Stephenson County. It…
Laona Township
Township · Laona Township is in western Winnebago County and includes part of Lake Summerset, a priva…
Owen Township
Township · Owen Township sits west of Rockford between Pecatonica and Winnebago village. It has an es…
Seward Township
Township · Seward Township sits in the northwest corner of Winnebago County, bordering both Wisconsin…
Shirland Township
Township · Shirland Township is the smallest Winnebago County township on this page by land area, tuc…
Boone County
Belvidere
City · Belvidere sits east of Rockford in Boone County, the furthest regular stop in the service …
Poplar Grove
Village
Capron
Village
Bonus Township
Township · Bonus Township sits in northern Boone County and is in Belvidere Community Unit School Dis…
Boone Township
Township · Boone Township sits in northeastern Boone County and is in North Boone Community Unit Scho…
Flora Township
Township · Flora Township sits in eastern Boone County and includes the unincorporated community of G…
Leroy Township
Township · Leroy Township is Boone County's least populous township, in the county's northeast corner…
Manchester Township
Township · Manchester Township sits in northern Boone County, sharing the 61011 ZIP code with Capron.…
Spring Township
Township · Spring Township sits in southeastern Boone County. It has an estimated 1,009 residents and…
Caledonia
Village · Caledonia is a small Boone County village, established in 1854 and incorporated in 1996, s…
Timberlane
Village · Timberlane is a Boone County village in Caledonia Township, just east of Caledonia. It has…
Radon test data by town
Each page pulls IEMA's own radon test records for that town, sorted here by the share of tests at or above the EPA's 4.0 pCi/L action level.
| Town | Tests | 4+ pCi/L | 20+ pCi/L |
|---|---|---|---|
| Mount Morris | 89 | 71.9% | 5.6% |
| Capron | 35 | 68.6% | 11.4% |
| Durand | 52 | 65.4% | 11.5% |
| Davis Junction | 91 | 58.2% | 1.1% |
| Poplar Grove | 351 | 58.1% | 3.7% |
| Oregon | 277 | 54.5% | 4.3% |
| Stillman Valley | 112 | 52.7% | 7.1% |
| Winnebago | 255 | 50.6% | 1.2% |
| Byron | 507 | 50.3% | 5.3% |
| Cherry Valley | 207 | 50.2% | 2.9% |
| Belvidere | 840 | 47.9% | 1.5% |
| Caledonia | 149 | 47.7% | 1.3% |
| Pecatonica | 99 | 45.5% | 4% |
| Rochelle | 377 | 41.4% | 0% |
| South Beloit | 243 | 40.7% | 2.5% |
| Rockton | 521 | 39.2% | 1.3% |
| Rockford | 4,404 | 36.8% | 0.8% |
| Machesney Park | 391 | 31.5% | 0% |
| Loves Park | 617 | 31.1% | 0.5% |
| Roscoe | 930 | 29.1% | 0.6% |
| Burritt Township | N/A | N/A | N/A |
| Harlem Township | N/A | N/A | N/A |
| Harrison Township | N/A | N/A | N/A |
| Laona Township | N/A | N/A | N/A |
| Owen Township | N/A | N/A | N/A |
| Seward Township | N/A | N/A | N/A |
| Shirland Township | N/A | N/A | N/A |
| Bonus Township | N/A | N/A | N/A |
| Boone Township | N/A | N/A | N/A |
| Flora Township | N/A | N/A | N/A |
| Leroy Township | N/A | N/A | N/A |
| Manchester Township | N/A | N/A | N/A |
| Spring Township | N/A | N/A | N/A |
| Timberlane | N/A | N/A | N/A |
Source: IEMA radon test records, tests submitted 2003 through July 2019, highest reading on record per address.
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