Village, Ogle County, Illinois
Radon Testing in Davis Junction, IL
Updated
IEMA has 91 radon test results on record for Davis Junction. 58.2% came back at or above the EPA's action level of 4.0 pCi/L. That is well above the Ogle County rate of 49.7%. A standard test runs $150 to $300. The only way to know about one specific house is to test it.
Davis Junction sits in southern Ogle County, close to the Winnebago County line, and is in Meridian Community Unit School District 223. It has about 2,757 residents and 916 housing units across 4.2 square miles.
What IEMA's radon test records show
Look past the median to the tail: 1.1% of Davis Junction tests were 20 pCi/L or more, five times the action level. The top reading on record is 22 pCi/L. The average result in Davis Junction is 5.68 pCi/L, against 5.98 for Ogle 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+ | |
|---|---|---|---|---|---|
| Davis Junction | 91 | 5.68 | 58.2% | 15.4% | 1.1% |
| Ogle County | 1,751 | 5.98 | 49.7% | 15.7% | 3.9% |
Source: IEMA radon test records, Illinois Emergency Management Agency.
The ground under Davis Junction
Ogle County straddles the Rock River south of Winnebago and Boone Counties, on dolomite and limestone bedrock with Ordovician rock visible in places along the riverbanks. The EPA rates the whole county Zone 1, its highest-potential radon classification, same as the counties to its north.
Housing in Davis Junction
Davis Junction has an estimated population of 2,757 and 916 housing units across 4.2 square miles. That works out to about 656 people per square mile, well past rural density for this part of Illinois. The Census Bureau doesn't separately publish a detailed housing-age or tenure breakdown at this population size, so Ogle County's own numbers, on the other Ogle County pages on this site, are the closest real context for Davis Junction 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 Davis Junction
Radon testing, Buying or selling a home, and New construction.
Common questions
Is radon a problem in Davis Junction?
Yes. Out of 91 IEMA-recorded tests taken in Davis Junction, 58.2% came in at 4.0 pCi/L or higher, the EPA's action level. That fits Ogle County's overall Zone 1 rating, the agency's highest-potential class.
What is the highest radon reading on record near Davis Junction?
22 pCi/L, out of 91 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 Davis Junction 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
Stillman Valley (52.7% of tests at 4+ pCi/L), Byron (50.3% of tests at 4+ pCi/L), Rochelle (41.4% of tests at 4+ pCi/L).
Need radon testing booked in Davis Junction?
Tell us why you're testing and any deadline you're working against. You get a fixed price and a straight answer back.