C & S Companies
Syracuse, NY
Listed for: TestingMitigation
Licenses on file: see the profile
Locations and reports
Radon in Syracuse, New York
EPA puts Onondaga County, where Syracuse is, in Zone 1, its highest radon zone, and 32.6% of its 224 reported radon tests (2023) were 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
32.6%
0.6 pts above NY
- Onondaga
- 32.6%
- New York
- 32.0%
Onondaga, 3rd of 6 in NY, 2023
Median result
2.5pCi/L
Below action level
- Onondaga
- 2.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Onondaga's tests, 2023
Nearest county
54.9%
Cortland, 31 miles
- Cortland
- 54.9%
- Onondaga
- 32.6%
122 tests, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Onondaga, where Syracuse is
Tests reported
224
In Onondaga
- Onondaga
- 224
- Cortland
- 122
Reported to CDC before any fix, 2023
Read a result for Syracuse
Starts at Onondaga County's median, 2.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.5 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. Onondaga County's median reported result, 2023.
The data
Syracuse, What is published
What is published for Syracuse
Information:
Every figure for Syracuse is a county's
Radon data is published by county, not by city, so for Syracuse it is Onondaga County's: its EPA zone (Zone 1) and the 224 tests reported to CDC for 2023. Only a test tells you about one home.
Syracuse covers 25.1 square miles of land, all of it in Onondaga County. Its 144,896 residents live 5,782 to the square mile.
Syracuse, Counties
The county Syracuse lies in
MeasuredOnondaga County's EPA zone and the figures CDC publishes for it, 2023.
Onondaga CountyZone 1Highest predicted potential
- 32.6%
- Reported tests at or above 4 pCi/L
- 2.5 pCi/L
- Median reported result
- 224 tests
- Tests reported to CDC
- 10
- Annual years on file
Onondaga County ranks 3rd of 6 New York counties with 30 or more tests for that period, 0.6 points above the 32.0% pooled across New York's counties, 0.8 points below the national pool of 33.4%.
The counties nearest Syracuse with a CDC figure for 2023, measured from the middle of the city: Cortland County (31 miles, 54.9% of 122 tests), Monroe County (79 miles, 10.0% of 40 tests) and Genesee County (104 miles, 46.7% of 150 tests). Across the 5 nearest, the share at or above 4 pCi/L runs from 10.0% to 54.9%; the farthest of them, Erie County, is 133 miles away at 26.3%.
The directory lists 3 businesses with an address in Syracuse, 2 for testing and 3 for mitigation. New York's other cities with a page of their own: Binghamton, Rochester, Ithaca and Buffalo.
The counties around Syracuse
By distance from the middle of Syracuse; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
Syracuse, Geology
The ground under Syracuse
PredictedMost of the ground under Syracuse is one class on USGS's geologic map: 84.0% of its land is moderate radon potential, with 16.0% high. The map puts 84.0% of Syracuse in the area it calls Erie-Ontario Lowland and 16.0% in Allegheny Plateau. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| 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 | 84.0% |
| Allegheny Plateau | Shale, limestone, and sandstone. | High | 12 | 16.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Syracuse beside its county and New York
Onondaga County as a whole has more high-potential ground than Syracuse: 54.4% of the county against 16.0% of the city. New York as a whole has more high-potential ground than Syracuse: 48.9% of its land, against 16.0% here.
The map rates the ground, not the air in any home.
Syracuse, Homes
Homes in Syracuse
Fewer than six in ten of Syracuse's 68,155 homes are detached houses (41%, against 63% across Onondaga County); the rest are attached, in shared buildings or mobile. The homes are older than Onondaga County's as a whole: half were built before 1947 (1963 for Onondaga County), and 68% date from before 1960. Most occupied homes here are rented: owners live in 41% (Onondaga County: 66%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Syracuse | Onondaga County | New York |
|---|---|---|---|
| Housing units | 68,155 | 211,683 | 8,539,536 |
| Detached houses | 41% | 63% | 41% |
| In buildings of 5 or more | 27% | 18% | 34% |
| Mobile homes | under 1% | 1% | 2% |
| Built before 1960 | 68% | 46% | 53% |
| Built since 2000 | 6% | 11% | 12% |
| Middle year built | 1947 | 1963 | 1958 |
| Owner-occupied | 41% | 66% | 54% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Syracuse, Professionals
Radon professionals listed in Syracuse
Businesses whose listed city is Syracuse, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Syracuse: 1 of 3
3 listings with Syracuse as the city. See radon mitigation and testing in Syracuse, or all radon professionals in New York.
Syracuse, Local resources
Local resources for Syracuse
Who to ask in New York: its radon program, test kits and professionals.
- Radon ProgramRun by New York State Department of Health, phone 518-402-7556.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 York3 listings cover Syracuse.
The program's own words on licensing are on the New York page.
What it means
Syracuse, Questions
Questions about radon in Syracuse
What radon zone is Syracuse in?
Syracuse has no zone of its own: it shares Onondaga County's, Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Syracuse?
A high result is no surprise around Syracuse: 32.6% of 224 tests reported from Onondaga County for 2023 reached 4 pCi/L or more. The median reported result was 2.5 pCi/L.
Should I test my home in Syracuse?
Yes. About 73 of the 224 tests reported from Onondaga County were at or above 4 pCi/L. That is about what New York as a whole reports (32.0%), and ranks Onondaga County 3rd of the 6 New York counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Syracuse built on, as far as radon goes?
84.0% of Syracuse sits on what USGS's map calls "Erie-Ontario Lowland", rated moderate for radon potential, radon index 9; another 16.0% is "Allegheny Plateau", rated high for radon potential, radon index 12. So the ground changes within Syracuse itself.
Is radon higher in the counties around Syracuse?
Some are and some are not. Against Onondaga County's 32.6%, 2 of the 5 nearest counties with a figure report more and 3 less, from Monroe County (10.0%, 79 miles off) to Cortland County (54.9%, 31 miles off).
Who tests for or fixes radon in Syracuse?
Radon411's directory has 3 businesses with an address in Syracuse, 2 listed for testing and 3 for mitigation. Every entry names the public list it was taken from. Radon professionals in Syracuse.
The answers use the published figures of Onondaga County, the county Syracuse lies in.
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