Updated November 2026 · Data: EPA Map of Radon Zones · Sources
Radon is a widespread concern in New York: 34 of its 62 counties are in EPA Zone 1, the group with the highest predicted indoor radon levels. Find your county below, then learn how to test your home and what to do if the result is high.
Your county’s zone is not your home’s radon level. Homes with high radon are found in every zone. The EPA recommends testing every home, whatever its zone.
Map of radon test results by county
Radon test results by county (NYSDOH data)
The New York State Department of Health publishes results from the radon test kits it provides to residents. Across 58 counties, 36.1% of 84,677 basement tests were at or above 4 pCi/L. The data does not include Bronx, Kings (Brooklyn), Queens or Richmond (Staten Island) counties. Click a county for results by town, village and city.
| County | Basement tests | Average (pCi/L) | At or above 4 pCi/L |
|---|---|---|---|
| Cortland | 2,084 | 14.21 | 74.4% |
| Chemung | 2,128 | 12.39 | 70.2% |
| Steuben | 1,638 | 11.81 | 65.3% |
| Tioga | 1,061 | 10.79 | 57.0% |
| Otsego | 1,603 | 8.86 | 56.5% |
| Chenango | 727 | 9.22 | 55.6% |
| Allegany | 551 | 10.64 | 55.2% |
| Dutchess | 3,428 | 6.79 | 53.3% |
| Wyoming | 567 | 9.47 | 52.0% |
| Delaware | 767 | 8.28 | 51.5% |
| Cattaraugus | 1,506 | 9.44 | 50.4% |
| Columbia | 801 | 6.85 | 50.1% |
| Onondaga | 10,354 | 7.89 | 46.0% |
| Herkimer | 331 | 6.54 | 45.9% |
| Rensselaer | 2,540 | 6.72 | 44.8% |
| Livingston | 1,038 | 7.96 | 43.4% |
| Schuyler | 260 | 6.21 | 42.7% |
| Washington | 618 | 6.33 | 42.2% |
| Yates | 255 | 5.50 | 41.2% |
| Madison | 1,308 | 6.09 | 40.9% |
| Schoharie | 386 | 6.29 | 40.2% |
| Oneida | 2,351 | 6.19 | 38.9% |
| Greene | 391 | 6.78 | 38.9% |
| Orange | 2,558 | 5.51 | 38.8% |
| Tompkins | 2,152 | 5.10 | 38.3% |
| Broome | 3,458 | 5.82 | 37.3% |
| Genesee | 1,076 | 7.47 | 37.2% |
| Ontario | 769 | 5.38 | 36.5% |
| Ulster | 1,520 | 5.15 | 36.3% |
| Chautauqua | 1,136 | 6.16 | 35.9% |
| Putnam | 1,261 | 4.69 | 34.3% |
| Cayuga | 1,383 | 4.67 | 33.0% |
| Montgomery | 274 | 3.96 | 32.5% |
| Lewis | 125 | 6.75 | 31.2% |
| Jefferson | 477 | 6.12 | 28.7% |
| Wayne | 643 | 4.57 | 28.3% |
| Saratoga | 1,849 | 4.09 | 27.8% |
| Sullivan | 247 | 3.76 | 27.5% |
| Albany | 3,161 | 5.28 | 24.4% |
| Schenectady | 1,382 | 4.54 | 22.8% |
| Erie | 7,957 | 5.13 | 22.3% |
| Orleans | 532 | 3.63 | 20.9% |
| Seneca | 225 | 3.04 | 19.1% |
| Warren | 338 | 3.32 | 18.0% |
| Westchester | 2,875 | 2.84 | 17.5% |
| Monroe | 3,356 | 3.45 | 16.4% |
| Hamilton | 25 | 2.10 | 16.0% |
| Fulton | 170 | 2.62 | 15.3% |
| Oswego | 316 | 2.86 | 15.2% |
| Rockland | 3,004 | 2.50 | 14.7% |
| St. Lawrence | 368 | 2.86 | 13.9% |
| Clinton | 377 | 2.26 | 12.2% |
| Niagara | 1,639 | 1.94 | 9.9% |
| Suffolk | 580 | 1.84 | 7.6% |
| New York | 1,611 | 1.64 | 7.2% |
| Essex | 180 | 1.65 | 6.1% |
| Nassau | 837 | 1.48 | 5.7% |
| Franklin | 123 | 3.27 | 4.9% |
EPA radon zones by county in New York
The table lists the EPA radon zone for each of the 62 counties in New York. The zone shows the predicted average indoor radon screening level for homes in that county.
| County | EPA zone | Predicted average indoor level |
|---|---|---|
| Albany | Zone 1 | Above 4 pCi/L |
| Allegany | Zone 1 | Above 4 pCi/L |
| Bronx | Zone 3 | Below 2 pCi/L |
| Broome | Zone 1 | Above 4 pCi/L |
| Cattaraugus | Zone 1 | Above 4 pCi/L |
| Cayuga | Zone 1 | Above 4 pCi/L |
| Chautauqua | Zone 1 | Above 4 pCi/L |
| Chemung | Zone 1 | Above 4 pCi/L |
| Chenango | Zone 1 | Above 4 pCi/L |
| Clinton | Zone 2 | 2 to 4 pCi/L |
| Columbia | Zone 1 | Above 4 pCi/L |
| Cortland | Zone 1 | Above 4 pCi/L |
| Delaware | Zone 1 | Above 4 pCi/L |
| Dutchess | Zone 1 | Above 4 pCi/L |
| Erie | Zone 1 | Above 4 pCi/L |
| Essex | Zone 3 | Below 2 pCi/L |
| Franklin | Zone 3 | Below 2 pCi/L |
| Fulton | Zone 3 | Below 2 pCi/L |
| Genesee | Zone 1 | Above 4 pCi/L |
| Greene | Zone 1 | Above 4 pCi/L |
| Hamilton | Zone 3 | Below 2 pCi/L |
| Herkimer | Zone 3 | Below 2 pCi/L |
| Jefferson | Zone 2 | 2 to 4 pCi/L |
| Kings | Zone 3 | Below 2 pCi/L |
| Lewis | Zone 2 | 2 to 4 pCi/L |
| Livingston | Zone 1 | Above 4 pCi/L |
| Madison | Zone 1 | Above 4 pCi/L |
| Monroe | Zone 2 | 2 to 4 pCi/L |
| Montgomery | Zone 2 | 2 to 4 pCi/L |
| Nassau | Zone 3 | Below 2 pCi/L |
| New York | Zone 3 | Below 2 pCi/L |
| Niagara | Zone 2 | 2 to 4 pCi/L |
| Oneida | Zone 2 | 2 to 4 pCi/L |
| Onondaga | Zone 1 | Above 4 pCi/L |
| Ontario | Zone 1 | Above 4 pCi/L |
| Orange | Zone 1 | Above 4 pCi/L |
| Orleans | Zone 2 | 2 to 4 pCi/L |
| Oswego | Zone 2 | 2 to 4 pCi/L |
| Otsego | Zone 1 | Above 4 pCi/L |
| Putnam | Zone 1 | Above 4 pCi/L |
| Queens | Zone 3 | Below 2 pCi/L |
| Rensselaer | Zone 1 | Above 4 pCi/L |
| Richmond | Zone 3 | Below 2 pCi/L |
| Rockland | Zone 3 | Below 2 pCi/L |
| St. Lawrence | Zone 2 | 2 to 4 pCi/L |
| Saratoga | Zone 2 | 2 to 4 pCi/L |
| Schenectady | Zone 2 | 2 to 4 pCi/L |
| Schoharie | Zone 1 | Above 4 pCi/L |
| Schuyler | Zone 1 | Above 4 pCi/L |
| Seneca | Zone 1 | Above 4 pCi/L |
| Steuben | Zone 1 | Above 4 pCi/L |
| Suffolk | Zone 3 | Below 2 pCi/L |
| Sullivan | Zone 1 | Above 4 pCi/L |
| Tioga | Zone 1 | Above 4 pCi/L |
| Tompkins | Zone 1 | Above 4 pCi/L |
| Ulster | Zone 1 | Above 4 pCi/L |
| Warren | Zone 3 | Below 2 pCi/L |
| Washington | Zone 1 | Above 4 pCi/L |
| Wayne | Zone 2 | 2 to 4 pCi/L |
| Westchester | Zone 3 | Below 2 pCi/L |
| Wyoming | Zone 1 | Above 4 pCi/L |
| Yates | Zone 1 | Above 4 pCi/L |
What the EPA radon zones mean
- Zone 1 (highest potential): predicted average indoor screening level greater than 4 pCi/L. In New York: 34 counties (55%).
- Zone 2 (moderate potential): predicted average between 2 and 4 pCi/L. In New York: 13 counties (21%).
- Zone 3 (low potential): predicted average below 2 pCi/L. In New York: 15 counties (24%).
The EPA built the map from indoor radon measurements, geology, soil permeability and type of house foundation. It was made to help governments and builders target resources, not to decide whether a single home needs testing.
New York counties with the highest radon potential
34 counties in New York are in Zone 1: Albany, Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung, Chenango, Columbia, Cortland, Delaware, Dutchess, Erie, Genesee, Greene, Livingston, Madison, Onondaga, Ontario, Orange, Otsego, Putnam, Rensselaer, Schoharie, Schuyler, Seneca, Steuben, Sullivan, Tioga, Tompkins, Ulster, Washington, Wyoming, Yates.
How to test for radon in New York
Testing is the only way to know your home’s radon level. Short-term test kits (2 to 90 days) are sold at hardware stores and online, and some state programs offer kits at low cost; check with the New York State Department of Health, Radon Program. Test in the lowest lived-in level of the home, with windows and doors closed, and follow the kit instructions.
- Do-it-yourself kits: a simple, low-cost first step for your own home.
- Long-term tests (more than 90 days): give a better picture of your home’s year-round average.
- Certified professionals: look for certification from the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), and ask the state program whether New York requires a state license.
- Buying or selling a home: ask for a radon test as part of the home inspection.
The New York State Department of Health (NYSDOH) sells radon test kits to residents through an order form (DOH-2247); call 518-402-7556 for details. Many county health departments also offer kits.
If your radon level is high
The EPA recommends fixing your home if the radon level is 4 pCi/L or higher, and considering a fix between 2 and 4 pCi/L. The most common fix is a radon mitigation system (sub-slab depressurization), which pulls radon from under the foundation and vents it outside, above the roof line.
- The EPA says most homes can be fixed for about the same cost as other common home repairs; the price depends on the size and design of the home.
- Get estimates from more than one qualified, certified mitigation contractor. See our radon mitigation cost guide for typical prices.
- Test again after the system is installed, and retest every few years.
Learn more: safe radon levels · how to test · test kits compared · radon and home sales · radon in well water
New York radon program
Radon rules and programs in New York
- High-risk counties: NYSDOH lists 41 counties as high-risk for radon.
- Follow-up testing: the state program has provided free testing for homes built with radon-resistant new construction and follow-up tests for homes with mitigation systems.
Contact
The New York State Department of Health, Radon Program answers questions from residents about radon testing, results and certified professionals.
- Phone: 518-402-7556 · 1-800-458-1158
- Website: www.health.ny.gov/environmental/radon
Contact details as listed by the state radon program directory. Please confirm on the program’s website before calling.
Frequently asked questions
Is radon a problem in New York?
34 of New York’s 62 counties are in EPA Zone 1, where the predicted average indoor radon level is above 4 pCi/L, and 13 are in Zone 2 (2 to 4 pCi/L). High levels can be found in any home, so testing is the only way to know.
Which New York counties have the highest radon potential?
The 34 counties in EPA Zone 1 have the highest predicted average levels. You can find them in the table above and in the Zone 1 list.
What radon level is safe?
There is no known safe level of radon. The EPA recommends fixing your home at 4 pCi/L or higher and considering a fix between 2 and 4 pCi/L.
Who can I contact about radon in New York?
The New York State Department of Health, Radon Program answers questions about testing, results and certified professionals. Phone: 518-402-7556; 1-800-458-1158.
Sources
- NYSDOH: Radon Test Results by County, Beginning 1987 (updated November 2025)
- NYSDOH: Radon test kit order form (DOH-2247) (checked November 2026)
- NYSDOH: Radon guide for residents (publication 3168) (January 2015)
- U.S. EPA: EPA Map of Radon Zones (county data file, June 2024)
- U.S. EPA: A Citizen’s Guide to Radon (checked November 2026)
- U.S. EPA: How much can a radon mitigation system cost? (updated September 16, 2026)
- New York State Department of Health, Radon Program (checked November 2026)
- SOSRadon.org (CRCPD): State radon contacts (checked November 2026)