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 Greene County, New York
EPA puts Greene County in Zone 1, its highest radon zone, and only 10 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
29.7%
4.8 pts above NY
- Greene
- 29.7%
- New York
- 24.9%
529 tests, 2007 to 2016
Median result
2.2pCi/L
Below action level
- Greene
- 2.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2007 to 2016
Tests reported
529
39th of 61 by tests
- Greene
- 529
- Erie
- 12,998
Reported to CDC before any fix, 2007 to 2016
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
24 of 61
Middle half
- Greene
- 29.7%
- Chemung
- 51.7%
By share, of 61 with 30+ tests
Read a result for Greene County
Starts at Greene County's median, 2.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.2 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. Greene County's median reported result, 2007 to 2016.
The data
Greene County, At a glance
Greene County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Greene 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 Greene County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 21.4% |
| 2015 | 8.3% |
| 2016 | 62.5% |
| 2017 | 45.0% |
| 2018 | 42.9% |
| 2019 | 12.5% |
| 2021 | 0.0% |
| 2022 | 100.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 10 tests were reported to CDC for Greene 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).
Greene County, Compared
Greene County radon figures, compared
Calculated by Radon411Greene County's 529 reported tests over the 2007 to 2016 laboratory totals had a middle value of 2.2 pCi/L and a maximum of 33.0 pCi/L, and 29.7% reached 4 pCi/L. New York as a whole (62 New York counties, pooled) comes to 24.9%: 4.8 points lower than here.
The newest figure, in 2023, counts only 10 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 529-test figure.
Among its state's counties it ranks 24th of 61 New York counties with 30 or more tests for the same period. Statewide for the same period, Chemung County reported the highest share (51.7%) and Bronx County the lowest (2.3%).
Below the action level, 245 tests (46.3%) came in under 2 pCi/L, against 51.6% statewide, and 127 tests (24.0%) fell between 2 and 4, against 23.5% statewide. The busiest year on file was 2017, with 20 tests reported; the quietest, 2021, had 2.
EPA's 1993 zone map puts Greene County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Next door, the shares run from 16.3% in Albany County to 41.9% in Columbia County, with Delaware County, Schoharie County and Albany County below Greene County.
CDC also counts 14 tests taken after mitigation in Greene County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Greene County, State data
New York's own radon test data
MeasuredWhat New York's own agencies publish about radon tests in Greene 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 Greene 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
32.3%
Average result
5.6 pCi/L
Tests behind these figures
12.4 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.
Greene County, Geology
The ground under Greene County
PredictedUSGS's geologic map puts all of Greene County's mapped land in one class: high radon potential. The map puts 87.4% of Greene County in the area it calls Allegheny Plateau and 12.6% in New England-Taconic Mountains. USGS gives both a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Allegheny Plateau | Shale, limestone, and sandstone. | High | 12 | 87.4% |
| New England-Taconic Mountains | Slate, phyllite, graywacke, and limestone. | High | 12 | 12.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Greene County beside the ground around it
Greene County has more high-potential ground than New York as a whole: 100% of its land against 48.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Ulster County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Greene County, Local resources
Radon testing and mitigation in Greene County
Listed radon businesses with an address in Greene 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: Catskill
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
Greene County, Questions
Questions about radon in Greene County
Are radon levels high in Greene County?
In 2023, 0.0% of the radon tests reported to CDC for Greene County, New York were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 61 New York counties with 30 or more tests for the same period, 23 reported a higher share; pooled, the state comes to 24.9%.
Which counties border Greene County?
Greene County borders 6 counties: Albany County, Columbia County, Ulster County, Schoharie County, Delaware County and Rensselaer County.
Products
Greene County, Products
Testing a home in Greene County
In Greene County, 29.7% of 529 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 24.9% pooled across New York. In Zone 1 the year-round level in Greene 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
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Greene County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Greene County
Explore
Greene County, Bordering counties
Counties bordering Greene County
Calculated by Radon411- Radon levels in Columbia CountyEPA zone 1
41.9%at or above 4 pCi/L
Median 3.0 pCi/L · 508 tests · 12.2 points above Greene County
- Radon levels in Rensselaer CountyEPA zone 1
30.7%at or above 4 pCi/L
Median 2.2 pCi/L · 1,552 tests · 1.0 points above Greene County
- Radon levels in Ulster CountyEPA zone 1
29.7%at or above 4 pCi/L
Median 2.2 pCi/L · 3,597 tests · 0.0 points above Greene County
- Radon levels in Delaware CountyEPA zone 1
26.9%at or above 4 pCi/L
Median 1.8 pCi/L · 931 tests · 2.8 points below Greene County
- Radon levels in Schoharie CountyEPA zone 1
22.2%at or above 4 pCi/L
Median 1.8 pCi/L · 500 tests · 7.5 points below Greene County
- Radon levels in Albany CountyEPA zone 1
16.3%at or above 4 pCi/L
Median 1.4 pCi/L · 2,672 tests · 13.4 points below Greene County
Greene County, Cities and towns
Cities and towns in Greene County
About 47,238 people live in Greene County by the Census Bureau's estimate for July 1, 2025, 505 fewer than in 2020 (−1.1%). That works out to 73 people per square mile of land. No town dominates: Catskill, the largest, has 3,697 residents, 7.8% of the total. Together its 5 incorporated places hold 18.9% of those residents; the other 81.1% live outside any of them. Testing is reported here more often than across the state: CDC's 529 reported tests for 2007 to 2016 come to 11.2 for every 1,000 residents (2025 estimate), against 4.6 for New York.
From Catskill to Hunter, CDC publishes no figure by town: each reads Greene County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Catskill | 3,697 | −2.6% | 7.8% |
| Coxsackie | 2,662 | −3.1% | 5.6% |
| Athens | 1,581 | +0.4% | 3.3% |
| Tannersville | 563 | −1.9% | 1.2% |
| Hunter | 407 | −0.7% | 0.9% |
5 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).
Greene County, Homes
Homes in Greene County
Greene County is a place of houses on their own lots: 75% of its 29,037 homes are detached single-family houses, against 41% across New York. Much of Greene County is recent building: 15% of its homes have gone up since 2000 and the middle year built is 1972, against 1958 for New York. 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 | Greene County | New York |
|---|---|---|
| Housing units | 29,037 | 8,539,536 |
| Detached houses | 75% | 41% |
| In buildings of 5 or more | 6% | 34% |
| Mobile homes | 7% | 2% |
| Built before 1960 | 38% | 53% |
| Built since 2000 | 15% | 12% |
| Middle year built | 1972 | 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.