Updated November 2026 · Data: New York State Department of Health radon test results (updated November 2025), EPA Map of Radon Zones · Sources and method
The New York State Department of Health (NYSDOH) has radon results for 441 homes in Oswego County tested with state test kits. In basements, 15.2% of 316 tests were at or above the EPA action level of 4 pCi/L and the average was 2.86 pCi/L; on first floors, 4.8% of 125 tests were at or above 4 pCi/L. Statewide, 36.1% of basement tests were at or above 4 pCi/L. Oswego County is in EPA radon Zone 2 (moderate potential).
These are area results, not your home’s level. Homes next to each other can have very different radon levels. The only way to know yours is to test.
Radon test results in Oswego County by floor
| Floor tested | Homes tested | Average (pCi/L) | Geometric mean (pCi/L) | At or above 4 pCi/L | At or above 20 pCi/L | Highest (pCi/L) |
|---|---|---|---|---|---|---|
| Basement | 316 | 2.86 | 1.57 | 15.2% | 1.6% | 56.3 |
| 1st Floor | 125 | 1.67 | 0.53 | 4.8% | 2.4% | 42.8 |
The geometric mean is less affected by a few very high readings than the simple average, so it is closer to a typical home.
Radon by town, village and city in Oswego County
Basement test results for communities with at least 10 homes tested.
| Community | Homes tested | Average (pCi/L) | At or above 4 pCi/L | Highest (pCi/L) |
|---|---|---|---|---|
| Constantia | 17 | 1.92 | 5.9% | 12.0 |
| Fulton | 45 | 3.41 | 17.8% | 56.3 |
| Hastings | 24 | 1.96 | 12.5% | 5.7 |
| Mexico | 15 | 2.63 | 13.3% | 12.0 |
| Oswego | 82 | 2.01 | 11.0% | 11.8 |
| Richland | 16 | 4.30 | 31.3% | 18.4 |
| Schroeppel | 33 | 2.74 | 18.2% | 18.2 |
| W. Monroe | 10 | 1.17 | 0.0% | 2.0 |
Communities with the highest share of high basement results (30+ homes tested): Schroeppel (18.2%), Fulton (17.8%), Oswego (11.0%).
How to test your home in Oswego County
- NYSDOH sells short-term charcoal radon test kits to residents; use the kit order form (DOH-2247) or call 518-402-7556. Many county health departments also offer kits.
- Place the kit in the lowest lived-in level of the home with windows and doors closed.
- If the result is 4 pCi/L or higher, the EPA recommends fixing the home; between 2 and 4 pCi/L, consider a fix.
- Hire a mitigator certified by the NRPP or NRSB. See typical prices in our radon mitigation cost guide.
Rules, contacts and every county’s EPA zone: Radon in New York.
Frequently asked questions
Is radon a problem in Oswego County?
15.2% of basement radon tests and 4.8% of first-floor tests in Oswego County were at or above 4 pCi/L in NYSDOH data. The county is in EPA radon Zone 2. Any home can have high radon, so testing is the only way to know.
What is the average radon level in Oswego County?
The average basement result is 2.86 pCi/L (geometric mean 1.57 pCi/L) and the average first-floor result is 1.67 pCi/L, based on NYSDOH test kits.
Where can I get a radon test kit in Oswego County?
NYSDOH sells test kits through its order form (518-402-7556), and many county health departments and hardware stores also sell them.
Sources and method
The data comes from short-term charcoal test kits that NYSDOH provides to residents through a contract laboratory; all results are entered in the state radon database. It does not include tests by private companies, so the number of tests is smaller than the number of homes tested in the county. Percent at or above 4 pCi/L = tests from 4 to 20 pCi/L plus tests at or above 20 pCi/L, divided by homes tested. Communities with few tests are left out. Data retrieved November 2026.
- NYSDOH: Radon Test Results by County, Beginning 1987 (updated November 18, 2025)
- NYSDOH: Radon Test Results by Town, Beginning 1987 (updated November 13, 2025)
- U.S. EPA: EPA Map of Radon Zones (June 2024 data file)
- NYSDOH Radon Program