Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Tazewell County, Illinois
EPA puts Tazewell County in Zone 1, its highest radon zone, and high results are common there: 46.4% of the 2,724 radon tests reported to CDC (2017) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
46.4%
12.7 pts above IL
- Tazewell
- 46.4%
- Illinois
- 33.7%
2,724 tests, 2017
Median result
3.6pCi/L
Below action level
- Tazewell
- 3.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2017
Tests reported
2,724
14th of 70 by tests
- Tazewell
- 2,724
- Cook
- 26,937
Reported to CDC before any fix, 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Illinois
28 of 70
Middle half
- Tazewell
- 46.4%
- Stark
- 69.2%
By share, of 70 with 30+ tests
Read a result for Tazewell County
Starts at Tazewell County's median, 3.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.6 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Tazewell County's median reported result, 2017.
The data
Tazewell County, At a glance
Tazewell County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Tazewell County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Tazewell County, 2017
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 52.4% |
| 2015 | 45.9% |
| 2016 | 0.0% |
| 2017 | 46.4% |
2017: 46.4%. Across these years the share ran from 0.0% to 52.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 2,724 tests reported to CDC for Tazewell County over 2017, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2017. Measured data period: 2005 to 2017 (every CDC figure on file).
Tazewell County, Compared
Tazewell County radon figures, compared
Calculated by Radon411In Tazewell County, about 5 in 10 reported tests in 2017 (1,263 of 2,724) were at or above EPA's action level. Against the national pool of 31.7%, the gap is 14.7 points higher. Across 93 Illinois counties pooled together, 33.7% of tests reached that level, so Tazewell County runs 12.7 points above its state.
Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 21.4% (Mason County) to 64.6% (Fulton County). By share, Tazewell County is 28th of 70 Illinois counties with 30 or more tests for the same period.
Year by year, 2014 opened at 52.4% and 2017 closed at 46.4% (down 6.0 points), with 2014 the high at 52.4%. Half the tests came in under 3.6 pCi/L and half over it; the single highest reached 37.7 pCi/L. Below the action level, 873 tests (32.0%) came in under 2 pCi/L, against 37.7% statewide, and 588 tests (21.6%) fell between 2 and 4, against 28.6% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 46.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2014, with 4,500 tests reported; the quietest, 2016, had 9.
Tazewell CountyIllinois, pooled
46.4% % of tests33.7% % of tests
| Year | Tests | Tazewell County, at or above 4 pCi/L | Illinois, pooled |
|---|---|---|---|
| 2014 | 4,500 | 52.4% | 37.8% |
| 2015 | 1,686 | 45.9% | 36.6% |
| 2017 | 2,724 | 46.4% | 33.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Tazewell County, Geology
The ground under Tazewell County
PredictedUSGS's geologic map puts all of Tazewell County's mapped land in one class: high radon potential. The map puts 69.9% of Tazewell County in the area it calls Bloomington Ridged Plain and 30.1% in Galesburg Plain. USGS gives both a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Bloomington Ridged Plain | Wisconsinan glacial deposits and loess over Paleozoic sedimentary rocks. | High | 13 | 69.9% |
| Galesburg Plain | Illinoian glacial deposits and loess over Paleozoic sedimentary rocks. | High | 13 | 30.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Tazewell County beside the ground around it
Tazewell County has more high-potential ground than Illinois as a whole: 100% of its land against 64.5%. Of the 6 counties that border it, none has as large a share of high-potential ground; Fulton County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Tazewell County, Local resources
Radon testing and mitigation in Tazewell County
Listed radon businesses with an address in Tazewell County:
- IEMA-OHS Radon ProgramIEMA-OHS Radon Program, run by Illinois Emergency Management Agency and Office of Homeland Security, licenses or certifies radon professionals and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Illinois.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Illinois339 professionals are listed in Illinois.
Listed radon professionals by town: East Peoria, Washington, Marquette Heights, Minier, Hopedale
What Illinois's program says
- Phone
- (800) 325-1245
- Licensing of radon professionals
The Agency also licenses and regulates the individuals who provide radon measurement and mitigation to the public.
- Disclosure when a home is sold or rented
Illinois Radon Awareness Act - This is the legislation that requires the seller to provide to the buyer of any interest in residential real property the IEMA-OHS pamphlet entitled "Radon Testing Guidelines for Real Estate Transactions" and the Illinois Disclosure of Information on Radon Hazards.
What it means
Tazewell County, Questions
Questions about radon in Tazewell County
Are radon levels high in Tazewell County?
In 2017, 46.4% of the radon tests reported to CDC for Tazewell County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of 70 Illinois counties with 30 or more tests for the same period, 27 reported a higher share; pooled, the state comes to 33.7%.
Which counties border Tazewell County?
Tazewell County borders 6 counties: Peoria County, Woodford County, Mason County, Logan County, Fulton County and McLean County.
Products
Tazewell County, Products
Testing a home in Tazewell County
In Tazewell County, 46.4% of 2,724 tests reported to CDC in 2017 reached 4 pCi/L, against 33.7% pooled across Illinois. In Zone 1 the year-round level in Tazewell County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Tazewell County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Tazewell County
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Tazewell County, Bordering counties
Counties bordering Tazewell County
Calculated by Radon411- Radon levels in Fulton CountyEPA zone 1
64.6%at or above 4 pCi/L
Median 5.8 pCi/L · 144 tests · 18.2 points above Tazewell County
- Radon levels in Woodford CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.2 pCi/L · 765 tests · 6.5 points above Tazewell County
- Radon levels in Logan CountyEPA zone 1
45.8%at or above 4 pCi/L
Median 3.4 pCi/L · 72 tests · 0.6 points below Tazewell County
- Radon levels in McLean CountyEPA zone 1
42.5%at or above 4 pCi/L
Median 3.3 pCi/L · 4,548 tests · 3.9 points below Tazewell County
- Radon levels in Peoria CountyEPA zone 1
40.2%at or above 4 pCi/L
Median 3.1 pCi/L · 3,816 tests · 6.2 points below Tazewell County
- Radon levels in Mason CountyEPA zone 1
21.4%at or above 4 pCi/L
Median 2.8 pCi/L · 42 tests · 25.0 points below Tazewell County
Tazewell County, Cities and towns
Cities and towns in Tazewell County
About 130,049 people live in Tazewell County by the Census Bureau's estimate for July 1, 2025, 1,251 fewer than in 2020 (−1.0%). That works out to 201 people per square mile of land. Pekin, the largest place on its list (31,277 residents in all), extends beyond Tazewell County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 2,724 reported tests for 2017 come to 20.9 for every 1,000 residents (2025 estimate), against 10.9 for Illinois.
From Pekin to Armington, CDC publishes no figure by town: each reads Tazewell County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Pekinextends beyond Tazewell County | 31,277 | −1.6% | Counted whole |
| East Peoria | 22,088 | −1.6% | 17.0% |
| Morton | 17,565 | +2.3% | 13.5% |
| Washington | 15,902 | −1.0% | 12.2% |
| Peoria Heightsextends beyond Tazewell County | 5,767 | −2.1% | Counted whole |
| Creve Coeur | 4,816 | −2.1% | 3.7% |
| Marquette Heights | 2,485 | −2.0% | 1.9% |
| Tremont | 2,243 | −1.1% | 1.7% |
| Mackinaw | 1,851 | −1.3% | 1.4% |
| Delavan | 1,548 | −1.6% | 1.2% |
| North Pekin | 1,447 | −2.2% | 1.1% |
| Minier | 1,138 | −1.4% | 0.9% |
- South Pekin
- Goodfield (part)
- Hopedale
- Deer Creek (part)
- Green Valley
- Armington
18 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Tazewell County is counted whole, so it has no share.
Tazewell County, Homes
Homes in Tazewell County
Tazewell County is a place of houses on their own lots: 80% of its 58,664 homes are detached single-family houses, against 58% across Illinois. Half of its homes were built before 1969, close to Illinois' 1970: 38% date from before 1960 and 14% from 2000 or later. Owners live in 78% of the occupied homes (Illinois: 67%), so for most households a test and a fix are their own to order.
| Homes | Tazewell County | Illinois |
|---|---|---|
| Housing units | 58,664 | 5,443,501 |
| Detached houses | 80% | 58% |
| In buildings of 5 or more | 9% | 22% |
| Mobile homes | 2% | 2% |
| Built before 1960 | 38% | 38% |
| Built since 2000 | 14% | 16% |
| Middle year built | 1969 | 1970 |
| Owner-occupied | 78% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.