Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Madison County, New York
EPA puts Madison County in Zone 1, its highest radon zone, and only 8 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
34.6%
10.1 pts above NY
- Madison
- 34.6%
- New York
- 24.5%
979 tests, 2008 to 2017
Median result
2.6pCi/L
Below action level
- Madison
- 2.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
979
27th of 61 by tests
- Madison
- 979
- Erie
- 13,822
Reported to CDC before any fix, 2008 to 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 New York
17 of 61
Middle half
- Madison
- 34.6%
- Chemung
- 52.3%
By share, of 61 with 30+ tests
Read a result for Madison County
Starts at Madison County's median, 2.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.6 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. Madison County's median reported result, 2008 to 2017.
The data
Madison County, At a glance
Madison County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Madison County in
USGS geologic potential: High across 79% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Madison County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 16.7% |
| 2015 | 43.2% |
| 2016 | 29.3% |
| 2017 | 49.3% |
| 2018 | 30.8% |
| 2019 | 39.6% |
| 2020 | 21.4% |
| 2021 | 33.3% |
| 2022 | 7.7% |
| 2023 | 62.5% |
2023: 62.5%. Across these years the share ran from 7.7% to 62.5%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 8 tests were reported to CDC for Madison County over 2023, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Madison County, Compared
Madison County radon figures, compared
Calculated by Radon411In Madison County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (339 of 979) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.1 points lower. Across 62 New York counties pooled together, 24.5% of tests reached that level, so Madison County runs 10.1 points above its state.
The newest figure, in 2023, counts only 8 tests (62.5% at or above 4 pCi/L), too few to compare, so this reading uses the 979-test figure.
Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 15.2% (Oswego County) to 51.0% (Cortland County). By share, Madison County is 17th of 61 New York counties with 30 or more tests for the same period.
Year by year, 2015 opened at 43.2% and 2022 closed at 7.7% (down 35.5 points), with 2017 the high at 49.3%. Half the tests came in under 2.6 pCi/L and half over it; the single highest reached 105.3 pCi/L. Below the action level, 394 tests (40.2%) came in under 2 pCi/L, against 51.7% statewide, and 246 tests (25.1%) fell between 2 and 4, against 23.7% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 34.6% share point the same way here. USGS geology rates 79% of the county's land high radon potential. CDC also counts 86 tests taken after mitigation in Madison County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2017, with 67 tests reported; the quietest, 2021, had 3.
Madison CountyNew York, pooled
7.7% % of tests22.4% % of tests
| Year | Tests | Madison County, at or above 4 pCi/L | New York, pooled |
|---|---|---|---|
| 2015 | 37 | 43.2% | 21.4% |
| 2016 | 58 | 29.3% | 20.4% |
| 2017 | 67 | 49.3% | 31.6% |
| 2019 | 53 | 39.6% | 28.0% |
| 2022 | 39 | 7.7% | 22.4% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Madison County, State data
New York's own radon test data
MeasuredWhat New York's own agencies publish about radon tests in Madison County, with their period. These are not CDC's figures and are never added to them.
MeasuredState figures, not CDC's
What the New York State Department of Health reports for Madison County
Indoor air radon testing data (Environmental Public Health Tracker): short-term charcoal canister tests requested through the NYSDOH Radon Program, presented as five-year rolling averages. Period: 2015-2019. The publisher also lists 15 earlier periods.
Share at or above 4 pCi/L
37.9%
Average result
5.6 pCi/L
Tests behind these figures
51.2 tests a year on average
- Every figure is a five-year rolling average: the average result is the rolling average of each year's mean, and the test count is an average per year.
- The data only include tests requested through the NYSDOH Radon Program, and therefore may not capture all radon tests performed in a county.
- The data include both screening tests and post-mitigation tests, as it is not always possible to tell them apart.
- Radon testing by homeowners is optional in New York, so the values may not be representative of every home in the county.
- These figures describe tests reported to the New York State Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.
Measured: New York State Department of Health data, 2015-2019.
Madison County, Geology
The ground under Madison County
PredictedMost of the ground under Madison County is one class on USGS's geologic map: 79.2% of its land is high radon potential, with 20.8% moderate. The map puts 79.2% of Madison County in the area it calls Allegheny Plateau and 20.8% in Erie-Ontario Lowland. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Allegheny Plateau | Shale, limestone, and sandstone. | High | 12 | 79.2% |
| Erie-Ontario Lowland | Limestone, dolomite, shale, sandstone, and salt deposits. | Moderate | 9 | 20.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Madison County beside the ground around it
Madison County has more high-potential ground than New York as a whole: 79.2% of its land against 48.9%. Of the 6 counties that border it, 3 have more high-potential ground, Chenango County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Madison County, Local resources
Radon testing and mitigation in Madison County
Listed radon businesses with an address in Madison County:
- Radon ProgramRadon Program, run by New York State Department of Health, does not license radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in New York.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Providing patients with information about how low-cost test kits may be obtained from the Radon Program.
- Compare kits
- Professionals in New York88 professionals are listed in New York.
Listed radon professionals by town: Canastota
What New York's program says
- Phone
- 518-402-7556
- radon@health.ny.gov
- Licensing of radon professionals
NYS does not certify or license radon testers.
What it means
Madison County, Questions
Questions about radon in Madison County
Are radon levels high in Madison County?
In 2023, 62.5% of the radon tests reported to CDC for Madison County, New York were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.2 pCi/L. Of 61 New York counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 24.5%.
Which counties border Madison County?
Madison County borders 6 counties: Oneida County, Onondaga County, Cortland County, Chenango County, Oswego County and Otsego County.
Products
Madison County, Products
Testing a home in Madison County
In Madison County, 34.6% of 979 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 24.5% pooled across New York. In Zone 1 the year-round level in Madison 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 Radon Wi-Fi radon monitor with an e-paper display
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Madison County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Madison County
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Madison County, Bordering counties
Counties bordering Madison County
Calculated by Radon411- Radon levels in Cortland CountyEPA zone 1
51.0%at or above 4 pCi/L
Median 4.1 pCi/L · 788 tests · 16.4 points above Madison County
- Radon levels in Otsego CountyEPA zone 1
37.6%at or above 4 pCi/L
Median 2.8 pCi/L · 1,452 tests · 3.0 points above Madison County
- Radon levels in Oneida CountyEPA zone 2
34.6%at or above 4 pCi/L
Median 2.5 pCi/L · 2,051 tests · 0.0 points above Madison County
- Radon levels in Chenango CountyEPA zone 1
33.4%at or above 4 pCi/L
Median 2.6 pCi/L · 961 tests · 1.2 points below Madison County
- Radon levels in Onondaga CountyEPA zone 1
28.4%at or above 4 pCi/L
Median 2.0 pCi/L · 9,114 tests · 6.2 points below Madison County
- Radon levels in Oswego CountyEPA zone 2
15.2%at or above 4 pCi/L
Median 1.4 pCi/L · 778 tests · 19.4 points below Madison County
Madison County, Cities and towns
Cities and towns in Madison County
About 67,120 people live in Madison County by the Census Bureau's estimate for July 1, 2025, 822 fewer than in 2020 (−1.2%). That works out to 102 people per square mile of land. No town dominates: Oneida, the largest, has 10,009 residents, 14.9% of the total. Testing is reported here more often than across the state: CDC's 979 reported tests for 2008 to 2017 come to 14.6 for every 1,000 residents (2025 estimate), against 4.9 for New York.
From Oneida to Madison, CDC publishes no figure by town: each reads Madison County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Oneida | 10,009 | −3.0% | 14.9% |
| Chittenango | 4,753 | −2.8% | 7.1% |
| Canastota | 4,400 | −3.0% | 6.6% |
| Hamilton | 4,078 | −0.7% | 6.1% |
| Cazenovia | 2,722 | −1.8% | 4.1% |
| Morrisville | 1,795 | +2.0% | 2.7% |
| Earlvilleextends beyond Madison County | 763 | −4.1% | Counted whole |
| Wampsville | 569 | +0.9% | 0.8% |
| Munnsville | 435 | −3.3% | 0.6% |
| DeRuyter | 414 | −3.3% | 0.6% |
| Madison | 313 | −2.8% | 0.5% |
11 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Madison County is counted whole, so it has no share.
Madison County, Homes
Homes in Madison County
Of Madison County's 30,676 homes, 73% are detached houses, against 41% across New York; 8% are in buildings of five or more homes. Half of its homes were built before 1964, close to New York's 1958: 46% date from before 1960 and 13% from 2000 or later. Owners live in 78% of the occupied homes (New York: 54%), so for most households a test and a fix are their own to order.
| Homes | Madison County | New York |
|---|---|---|
| Housing units | 30,676 | 8,539,536 |
| Detached houses | 73% | 41% |
| In buildings of 5 or more | 8% | 34% |
| Mobile homes | 7% | 2% |
| Built before 1960 | 46% | 53% |
| Built since 2000 | 13% | 12% |
| Middle year built | 1964 | 1958 |
| Owner-occupied | 78% | 54% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.