New York Radon Map, Levels & Testing Guide
Browse the 42 listed county pages surfaced for New York. Open a listed county to compare its EPA zone, source caveats, testing meaning, and when mitigation pricing becomes worth checking.
High Risk
Moderate
Low Risk
Official Evidence in New York
42 of 42 listed counties have official evidence
Open a county page to see the processed verdict: source confidence, local burden, state percentile, and the next step for no reading, 2.0-3.9, or 4.0+ pCi/L.
100%
covered
Measured
42
State source
42
CDC source
0
Needs source detail
0
Measured Risk Leaders in New York
County rankings from actual reported radon tests
These lists rank the visible New York county pages by measured radon signals, not by the EPA zone label alone. Use them to spot where the state hub has a real data story before opening individual county pages.
42
measured counties
State-level verdict
This hub has measured high-burden counties, so the first click should be evidence-led.
The state hub is now doing a decision job: it separates first-click counties, retest counties, and lower-signal counties from 42 visible county measurement rows. 31 counties cross the high measured-burden band, so those pages should answer testing and 4.0+ action questions most directly.
First-click counties
Open Chemung County first when you need the strongest local answer. It is tagged Test-now from 54.5% 4.0+ - 11.2 pCi/L primary - 110 tests. 37 visible measured counties are elevated or high enough to review before lower-signal counties.
Buyer/seller lane
Buyer/seller lane: start with the elevated or high counties, require a fresh lowest-level test, and turn any 4.0+ property result into quote or credit math. The hub has 42 state-source county rows to support that routing.
Retest lane
Retest lane: 2.0-3.9 pCi/L deserves more caution in the elevated/high county set than in lower-signal counties. The hub should send those users to county pages before product or cost paths.
Best county pages to open first
Start with these local evidence pages
Ranked by measured burden, 4.0+ share, test volume, and whether the EPA zone understates the measurement signal.
Chemung County
NY DOH
54.5% 4.0+ - 11.2 pCi/L primary - 110 tests
Chemung County is a first-click page: 54.5% of reported tests at or above 4.0 and 11.2 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Cortland County
NY DOH
60.2% 4.0+ - 9.6 pCi/L primary - 644 tests
Cortland County is a first-click page: 60.2% of reported tests at or above 4.0 and 9.6 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Oneida County
NY DOH
44.5% 4.0+ - 11.0 pCi/L primary - 200 tests
Oneida County is a first-click page: 44.5% of reported tests at or above 4.0 and 11.0 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Tioga County
NY DOH
51.6% 4.0+ - 9.3 pCi/L primary - 339 tests
Tioga County is a first-click page: 51.6% of reported tests at or above 4.0 and 9.3 pCi/L primary result. Route no-reading users to a test now and 4.0+ users to quote or credit planning.
Highest 4.0+ share
Primary result 4.2 pCi/L - high-end 6.3 pCi/L
NY DOH
Primary result 9.6 pCi/L - high-end 69.0 pCi/L
NY DOH
Primary result 11.2 pCi/L - high-end 99.4 pCi/L
NY DOH
Primary result 9.3 pCi/L - high-end 109.8 pCi/L
NY DOH
Primary result 8.2 pCi/L - high-end 22.5 pCi/L
NY DOH
Highest high-end reading
4.0+ share 44.5% - primary result 11.0 pCi/L
NY DOH
4.0+ share 32.9% - primary result 7.3 pCi/L
NY DOH
4.0+ share 41.4% - primary result 6.1 pCi/L
NY DOH
4.0+ share 51.6% - primary result 9.3 pCi/L
NY DOH
4.0+ share 54.5% - primary result 11.2 pCi/L
NY DOH
Most reported tests
4.0+ share 41.4% - primary result 6.1 pCi/L
NY DOH
4.0+ share 23.1% - primary result 4.1 pCi/L
NY DOH
4.0+ share 12.8% - primary result 2.4 pCi/L
NY DOH
4.0+ share 28.3% - primary result 4.1 pCi/L
NY DOH
4.0+ share 60.2% - primary result 9.6 pCi/L
NY DOH
Measured pattern
Among 42 visible counties with measurement tables, 31 land in the high measured-burden band and 37 land in high or elevated measured-burden bands. That lets this hub rank counties by observed test distribution instead of repeating the EPA map.
Map vs measurements
4 elevated measured counties are not EPA Zone 1. Those are the pages where the actual test distribution matters more than a map-only answer.
Source confidence
All measured rows shown here use state-specific official sources, so this hub can make source-backed county comparisons without leaning on a national fallback.
Already Tested
View New York Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Understand the Number
2.0 vs 4.0 vs 8.0 pCi/L
Use the parent levels guide if you need the plain-English meaning of a radon result before browsing counties.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Official State Resource
New York radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure note
New York does not have a state-mandated radon disclosure requirement, but sellers must complete the Property Condition Disclosure Statement, and failing to disclose known issues can create legal liability.
Credential note
New York does not require state licensing for radon professionals, but the NRPP and AARST certifications are industry standard.
Already tested? Get your itemized mitigation cost estimate.
View New York Mitigation Cost Estimates ->