Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Monroe County, New York
EPA puts Monroe County in Zone 2, its middle radon zone, and most reported tests there come back low, though 10.0% of 40 (2023) reached 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
10.0%
22.0 pts below NY
- Monroe
- 10.0%
- New York
- 32.0%
40 tests, 2023
Median result
1.5pCi/L
Below action level
- Monroe
- 1.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
40
5th of 6 by tests
- Monroe
- 40
- Onondaga
- 224
Reported to CDC before any fix, 2023
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in New York
6 of 6
Lowest quarter
- Monroe
- 10.0%
- Cortland
- 54.9%
By share, of 6 with 30+ tests
Read a result for Monroe County
Starts at Monroe County's median, 1.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.5 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Monroe County's median reported result, 2023.
The data
Monroe County, At a glance
Monroe County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Monroe County is a
USGS geologic potential: Moderate across 97% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Monroe County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.8% |
| 2015 | 1.4% |
| 2016 | 3.0% |
| 2017 | 13.7% |
| 2018 | 10.6% |
| 2019 | 8.9% |
| 2020 | 4.8% |
| 2021 | 6.3% |
| 2022 | 25.0% |
| 2023 | 10.0% |
2023: 10.0%. Across these years the share ran from 0.8% to 25.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 40 tests reported to CDC for Monroe County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Monroe County, Compared
Monroe County radon figures, compared
Calculated by Radon411Monroe County reports fewer high tests than New York overall. 10.0% of its 40 tests in 2023 were at or above 4 pCi/L. That is 22.0 points below the 32.0% pooled from 56 New York counties.
Ordered from highest share down, it comes 6th of 6 New York counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 33.4%; Monroe County sits 23.4 points below it.
Genesee County, the one bordering county with a figure for the same period, reported 46.7%. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 10.0% share point the same way here.
Half the tests came in under 1.5 pCi/L and half over it; the single highest reached 45.4 pCi/L. The rest split 65.0% under 2 pCi/L and 25.0% from 2 to 4 (New York: 44.7% and 23.3%). Year by year, 2014 opened at 0.8% and 2023 closed at 10.0% (up 9.2 points), with 2017 the high at 13.7%.
The busiest year on file was 2014, with 1,852 tests reported; the quietest, 2022, had 24.
Monroe CountyNew York, pooled
10.0% % of tests32.0% % of tests
| Year | Tests | Monroe County, at or above 4 pCi/L | New York, pooled |
|---|---|---|---|
| 2014 | 1,852 | 0.8% | 16.6% |
| 2015 | 806 | 1.4% | 21.4% |
| 2016 | 946 | 3.0% | 20.4% |
| 2017 | 168 | 13.7% | 31.6% |
| 2018 | 113 | 10.6% | 26.9% |
| 2019 | 124 | 8.9% | 28.0% |
| 2020 | 83 | 4.8% | 22.7% |
| 2021 | 48 | 6.3% | 18.9% |
| 2023 | 40 | 10.0% | 32.0% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Monroe County, State data
New York's own radon test data
MeasuredWhat New York's own agencies publish about radon tests in Monroe 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 Monroe 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
12.8%
Average result
2.4 pCi/L
Tests behind these figures
131.4 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.
Monroe County, Geology
The ground under Monroe County
PredictedMost of the ground under Monroe County is one class on USGS's geologic map: 96.8% of its land is moderate radon potential, with 3.0% high. 96.8% of it lies in the area the map calls Erie-Ontario Lowland, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Erie-Ontario Lowland | Limestone, dolomite, shale, sandstone, and salt deposits. | Moderate | 9 | 96.8% |
| Allegheny Plateau | Shale, limestone, and sandstone. | High | 12 | 3.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Monroe County beside the ground around it
New York as a whole has more high-potential ground than Monroe County: 48.9% of its land, against 3.0% here. Of the 5 counties that border it, 3 have more high-potential ground, Livingston County the most at 97.5%.
The map rates the ground, not the air in any home.
Local help
Monroe County, Local resources
Radon testing and mitigation in Monroe County
Listed radon businesses with an address in Monroe 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: Rochester, Pittsford
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
Monroe County, Questions
Questions about radon in Monroe County
Are radon levels high in Monroe County?
In 2023, 10.0% of the radon tests reported to CDC for Monroe County, New York were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of 6 New York counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 32.0%.
Which counties border Monroe County?
Monroe County borders 5 counties: Orleans County, Genesee County, Wayne County, Livingston County and Ontario County.
Products
Monroe County, Products
Testing a home in Monroe County
In Monroe County, 10.0% of 40 tests reported to CDC in 2023 reached 4 pCi/L, against 32.0% pooled across New York. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Monroe County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Monroe County, Bordering counties
Counties bordering Monroe County
Calculated by Radon411- Radon levels in Genesee CountyEPA zone 1
46.7%at or above 4 pCi/L
Median 3.6 pCi/L · 150 tests · 36.7 points above Monroe County
- Radon levels in Wayne CountyEPA zone 2
33.3%at or above 4 pCi/L
Median 3.3 pCi/L · 3 tests · 23.3 points above Monroe County
- Radon levels in Livingston CountyEPA zone 1
33.3%at or above 4 pCi/L
Median 2.9 pCi/L · 6 tests · 23.3 points above Monroe County
- Radon levels in Ontario CountyEPA zone 1
28.6%at or above 4 pCi/L
Median 1.2 pCi/L · 7 tests · 18.6 points above Monroe County
- Radon levels in Orleans CountyEPA zone 2
25.0%at or above 4 pCi/L
Median 1.8 pCi/L · 4 tests · 15.0 points above Monroe County
Monroe County, Cities and towns
Cities and towns in Monroe County
About 750,506 people live in Monroe County by the Census Bureau's estimate for July 1, 2025, 7,878 fewer than in 2020 (−1.0%). Packed into its land, that is 1,142 people per square mile. Its largest town, Rochester, has 206,108 residents, 27.5% of the total. Together its 11 incorporated places hold 33.2% of those residents; the other 66.8% live outside any of them. CDC's 40 reported tests for 2023 work out to 0.1 per 1,000 residents (2025 estimate), close to New York's 0.1.
From Rochester to Pittsford, CDC publishes no figure by town: each reads Monroe County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Rochester | 206,108 | −2.2% | 27.5% |
| Brockport | 7,736 | +9.5% | 1.0% |
| East Rochester | 6,132 | −3.2% | 0.8% |
| Hilton | 5,873 | −2.6% | 0.8% |
| Webster | 5,761 | +1.7% | 0.8% |
| Fairport | 5,326 | −2.4% | 0.7% |
| Spencerport | 3,592 | −2.5% | 0.5% |
| Honeoye Falls | 2,841 | +2.8% | 0.4% |
| Churchville | 2,134 | −1.1% | 0.3% |
| Scottsville | 1,994 | −2.5% | 0.3% |
| Pittsford | 1,323 | −3.1% | 0.2% |
Places in Monroe County with a city page: 1 of 1
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).
Monroe County, Homes
Homes in Monroe County
Of Monroe County's 337,688 homes, 62% are detached houses, against 41% across New York; 18% are in buildings of five or more homes. Half of its homes were built before 1965, close to New York's 1958: 43% date from before 1960 and 11% from 2000 or later. 64% of occupied homes are lived in by their owner (New York: 54%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Monroe County | New York |
|---|---|---|
| Housing units | 337,688 | 8,539,536 |
| Detached houses | 62% | 41% |
| In buildings of 5 or more | 18% | 34% |
| Mobile homes | 1% | 2% |
| Built before 1960 | 43% | 53% |
| Built since 2000 | 11% | 12% |
| Middle year built | 1965 | 1958 |
| Owner-occupied | 64% | 54% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.