Township, Winnebago County, Illinois
Radon Testing in Harrison Township, IL
Updated
IEMA does not have enough recorded radon tests in Harrison 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.
Harrison Township sits on Winnebago County's western edge, bordering Stephenson County. It's sparsely populated: an estimated 405 residents and 169 housing units across 24.6 square miles, about 16 people per square mile, and many addresses out here use a neighboring town's mailing city rather than their own.
The ground under Harrison Township
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 Harrison Township
Real Census numbers for Harrison Township: about 405 residents and 169 housing units spread over 24.6 square miles. At around 16 people per square mile, it's genuinely rural, among the lowest-density places on this site. At this population size the Census Bureau doesn't break out housing age or tenure separately, so what shows up on the Winnebago County towns elsewhere on this site is the nearest real comparison, not a Harrison Township-specific number.
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 Harrison Township
Radon testing, Buying or selling a home, and New construction.
Common questions
Is radon a problem in Harrison 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 Harrison Township soon. Is there time to test?
Usually yes. A short-term test takes a few days to about a week, which fits inside most inspection periods if it's scheduled early. See our <a href="/real-estate-radon-testing">real estate radon testing</a> page for how that timing works.
Nearby
Pecatonica (45.5% of tests at 4+ pCi/L), Winnebago (50.6% of tests at 4+ pCi/L), Rockford (36.8% of tests at 4+ pCi/L).
Need radon testing booked in Harrison Township?
Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.