Listed for: Mitigation
Verified:Illinois state license
Locations and reports
EPA puts Will County, where New Lenox is, in Zone 2, its middle radon zone, and high results are common there: 40.0% of the 10,776 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
40.0%
6.3 pts above IL
Will, 42nd of 70 in IL, 2017
Median result
3.1pCi/L
Below action level
Midpoint of Will's tests, 2017
Nearest county
19.4%
Cook, 24 miles
26,937 tests, 2017
EPA radon zone
Zone 2
Moderate potential
1 highest, 3 lowest
Will, where New Lenox is
Tests reported
10,776
In Will
Reported to CDC before any fix, 2017
Read a result for New Lenox
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.1 pCi/L
Between 2 and 4 pCi/L
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Will County's median reported result, 2017.
The data
New Lenox, What is published
Every figure for New Lenox is a county's
Radon data is published by county, not by city, so for New Lenox it is Will County's: its EPA zone (Zone 2) and the 10,776 tests reported to CDC for 2017. Only a test tells you about one home.
New Lenox covers 15.7 square miles of land, all of it in Will County. About 28,893 people live there, 1,838 to the square mile.
New Lenox, Counties
Will County's EPA zone and the figures CDC publishes for it, 2017.
Will CountyZone 2Moderate predicted potential
Will County ranks 42nd of 70 Illinois counties with 30 or more tests for that period, 6.3 points above the 33.7% pooled across Illinois's counties, 8.3 points above the national pool of 31.7%.
Measured from the middle of New Lenox, the nearest counties with a CDC figure for 2017 are Cook County (24 miles, 19.4% of 26,937 tests), DuPage County (24 miles, 33.7% of 19,401 tests) and Kendall County (24 miles, 35.0% of 3,045 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 19.4% to 45.8%; the farthest of them, DeKalb County, is 49 miles away at 41.1%.
The directory lists 2 businesses with an address in New Lenox, 1 for testing and 1 for mitigation. Illinois's other cities with a page of their own: Chicago, Rockford, Naperville and Springfield.
By distance from the middle of New Lenox; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2017.
New Lenox, Geology
Most of the ground under New Lenox is one class on USGS's geologic map: 80.2% of its land is moderate radon potential, with 19.8% high. The map puts 80.2% of New Lenox in the area it calls Wheaton Morainal Country and 19.8% in Bloomington Ridged Plain. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Wheaton Morainal Country | Glacial lake deposits and clay-rich glacial till. | Moderate | 11 | 80.2% |
| Bloomington Ridged Plain | Wisconsinan glacial deposits and loess over Paleozoic sedimentary rocks. | High | 13 | 19.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Will County as a whole has more high-potential ground than New Lenox: 59.8% of the county against 19.8% of the city. Illinois as a whole has more high-potential ground than New Lenox: 64.5% of its land, against 19.8% here.
The map rates the ground, not the air in any home.
New Lenox, Homes
New Lenox is a place of houses on their own lots: 81% of its 9,473 homes are detached single-family houses, against 75% across Will County. Half of its homes were built before 1997, close to Will County's 1992: 6% date from before 1960 and 41% from 2000 or later. Owners live in 91% of the occupied homes (Will County: 83%), so for most households a test and a fix are their own to order.
| Homes | New Lenox | Will County | Illinois |
|---|---|---|---|
| Housing units | 9,473 | 252,684 | 5,443,501 |
| Detached houses | 81% | 75% | 58% |
| In buildings of 5 or more | 5% | 8% | 22% |
| Mobile homes | under 1% | 1% | 2% |
| Built before 1960 | 6% | 16% | 38% |
| Built since 2000 | 41% | 32% | 16% |
| Middle year built | 1997 | 1992 | 1970 |
| Owner-occupied | 91% | 83% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
New Lenox, Professionals
Businesses whose listed city is New Lenox, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in New Lenox: 1 of 2
2 listings with New Lenox as the city. See radon mitigation and testing in New Lenox, or all radon professionals in Illinois.
New Lenox, Local resources
Who to ask in Illinois: its radon program, test kits and professionals.
The program's own words on licensing and disclosure are on the Illinois page.
What it means
New Lenox, Questions
New Lenox takes its zone from Will County, which EPA puts in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.
High results are ordinary around New Lenox: 40.0% of the 10,776 tests reported from Will County for 2017 were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 3.1 pCi/L.
Yes. Will County reported about 4,310 of its 10,776 tests at or above 4 pCi/L. That is above Illinois' pooled 33.7%, and ranks Will County 42nd of the 70 Illinois counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
80.2% of New Lenox sits on what USGS's map calls "Wheaton Morainal Country", rated moderate for radon potential, radon index 11; another 19.8% is "Bloomington Ridged Plain", rated high for radon potential, radon index 13. So the ground changes within New Lenox itself.
It depends which way you go. 2 of the 8 nearest counties with a figure report a larger share than Will County's 40.0% and 6 a smaller one: from Cook County (19.4%, 24 miles off) to LaSalle County (45.8%, 49 miles off).
New Lenox is the address of 2 businesses in Radon411's directory, 1 listed for testing and 1 for mitigation. Each entry names the public list it came from. Radon professionals in New Lenox.
The answers use the published figures of Will County, the county New Lenox lies in.
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