Township, Winnebago County, Illinois
Radon Testing in Shirland Township, IL
Updated
IEMA does not have enough recorded radon tests in Shirland Township to break out separately yet. Winnebago County, Illinois as a whole sits in the EPA's Radon Zone 1, its highest-potential category, so testing is worth doing regardless.
Shirland Township is the smallest Winnebago County township on this page by land area, tucked between Rockton and the Wisconsin line. It has an estimated 1,007 residents and 422 housing units across 19.2 square miles. IEMA has exactly one radon test on file under the Shirland mailing address, too few to report a share from; the county numbers below stand in for it.
The ground under Shirland Township
Underneath Winnebago County, north-central Illinois, sits Ordovician and Silurian dolomite and limestone, the same bedrock family that runs through much of this part of the state, topped by glacial till from the last Ice Age. The EPA's radon zone map puts the county in Zone 1, its top category for predicted indoor levels.
Housing in Shirland Township
Shirland Township has an estimated population of 1,007 and 422 housing units across 19.2 square miles. That's about 52 people per square mile, thin enough that most of the land here is farmland, not subdivisions. The Census Bureau doesn't separately publish a detailed housing-age or tenure breakdown at this population size, so Winnebago County's own numbers, on the other Winnebago County pages on this site, are the closest real context for Shirland Township specifically, not a figure unique to it.
Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates (via Census Reporter) and 2024 TIGER/Line county subdivision and place boundaries.
What we do in Shirland Township
Radon testing, Buying or selling a home, and New construction.
Common questions
Is radon a problem in Shirland Township?
Winnebago County sits in EPA Radon Zone 1, the highest-potential category, so yes, testing is worth doing regardless of the specific house.
We're closing on a house in Shirland Township 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 <a href="/real-estate-radon-testing">real estate radon testing</a> page.
Nearby
Rockton (39.2% of tests at 4+ pCi/L), South Beloit (40.7% of tests at 4+ pCi/L), Burritt Township.
Need radon testing booked in Shirland Township?
Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.