Radon in Bronx County, New York
Bronx County, New York, is in EPA radon Zone 3: predicted average indoor radon screening level less than 2 pCi/L (low potential). Radon laboratories reported 132 building tests here for 2008 to 2017: median 0.5 pCi/L, with 3.2% at or above EPA's 4 pCi/L action level (New York 24.2%, US 36.5%).
Radon test results in Bronx County
| Test results | Period | Tests | Typical result | 4 pCi/L or more |
|---|---|---|---|---|
| Radon testing laboratories | 2008-2017 | 132 | median 0.5 pCi/L | 3.2% |
| New York radon program | 2023 | 1 | median 2.1 pCi/L | n/a |
| New York, all counties (labs) | 2008-2017 | 65,893 | n/a | 24.2% |
| United States (labs) | 2008-2017 | 1,408,802 | n/a | 36.5% |
Test results describe buildings whose owners chose to test and whose results reached the lab or agency, not a random sample; small counts swing widely. State and US shares are computed from county counts and percents. The laboratory data comes from national radon testing laboratories and supplements EPA's zone map.
Radon in nearby counties
| County | EPA zone | Lab tests | 4 pCi/L or more |
|---|---|---|---|
| New York County, NY | Zone 3 | 498 | 7.1% |
| Queens County, NY | Zone 3 | 320 | 5.3% |
| Bergen County, NJ | Zone 2 | n/a | n/a |
| Hudson County, NJ | Zone 2 | n/a | n/a |
| Kings County, NY | Zone 3 | 489 | 8.1% |
| Nassau County, NY | Zone 3 | 483 | 5.2% |
The six counties with the nearest centers.
What to do about radon in Bronx County
Test the building. EPA recommends fixing a home at 4 pCi/L or more and considering a fix between 2 and 4 pCi/L, and says there is no known safe level of exposure. The state health department runs the state's radon program.
Buying here? The Environmental Records Report lists this county's radon zone and test results with the flood zone, mapped faults, power lines and federal contamination records near the address.
HeritageDeed searches title in Bronx County: Order a The Bronx title search, owner of record, deeds, mortgages and liens, $49 per report.
Radon in Bronx County: questions
What is the radon level in Bronx County?
The median of the 132 laboratory tests reported for Bronx County (2008 to 2017) was 0.5 pCi/L, and 3.2% of them were at or above 4 pCi/L. These are results of tested buildings; a single home can be far above or below them.
Is Bronx County in radon Zone 1?
No. EPA's 1993 map puts Bronx County in Zone 3 (predicted average indoor radon screening level less than 2 pCi/L (low potential)). EPA says homes in every zone can have high radon and should be tested.
How does radon in Bronx County compare with New York?
3.2% of laboratory tests in Bronx County were at or above 4 pCi/L for 2008 to 2017, against 24.2% across New York (65,893 tests) and 36.5% nationally. 34 of New York's 62 counties are in Zone 1.
Should I test for radon in Bronx County?
Yes. EPA recommends testing every home whatever its zone: "This map should not be used to determine if individual homes need to be tested." Fix the home at 4 pCi/L or more and consider a fix between 2 and 4 pCi/L; EPA says there is no known safe level of radon exposure.
More for Bronx County
- The Bronx title searchOwner of record, deeds, mortgages and liens from the official Bronx County records, $49 per report.
- Bronx property history lookupFree timeline of what has been recorded against any Bronx property: deeds, sale prices, mortgages and releases by year, from official county records.
- Bronx property fraud alertThe recording office's own alert service for Bronx, and free nightly monitoring of a property's official records: new recorded documents, owner changes and tax sale lists.
- Bronx tax lien sale listProperties on the official list, refreshed nightly, with sale dates, the published bid amounts and the bidding and redemption rules.
- Bronx property tax appealAppeal deadlines from the official calendar, the free filing route, and an evidence pack with assessment history and comparable sales.
- Recently sold in BronxSales of the last 90 published days from the official records: address, date and price, by ZIP code, refreshed nightly.
- NYC zoning lookupThe zoning district, overlays and special districts of a NYC address, from the city's own zoning data.
- Who is my landlord? (Bronx)The building's HPD registration: registered owner, managing agent, head officer (initials) and open violations.
- NYC UCC searchUCC fixture and co-op filings and federal tax liens recorded with the City Register, by business debtor name.
- New York LLC lookupDepartment of State record for an LLC and the Bronx properties recorded to it.
- New York title insurance calculatorTIRSA owner's and loan policy premiums for Zone 2 (NYC and downstate) and Zone 1 counties.
- NYC closing cost calculatorState and City transfer taxes, the 1% mansion tax, title premiums and the seller's net.
- Bronx loan limitsThis year's FHFA conforming, FHA and VA county loan limits for 1 to 4 unit homes, from FHFA's and HUD's official files.
- Bronx fair market rentHUD Fair Market Rents for studios to 4 bedrooms, the voucher payment standard range and the change from last year.
- Bronx property tax rateEffective property tax rate from Census survey data: median taxes paid against median home value, ranked in the state.
- Environmental records reportSuperfund, hazardous waste, leaking tank and brownfield sites near any Bronx address, with distances and a site map. A records search, not a Phase I.
- Superfund sites in New YorkEvery EPA Superfund site in New York with its status, county and a map, refreshed nightly from federal records.
- USDA eligibility map: New YorkHow much of each New York county is in a USDA-eligible rural area, the towns mapped ineligible, and a free address check.
- Opportunity zones in New YorkEvery designated Opportunity Zone tract in New York by county, from the IRS list, and the tracts eligible for the 2027 round.
- Census tract lookupThe census tract of any Bronx address with its FFIEC income level and HUD Qualified Census Tract and DDA status.
Other free hazard lookups
- Fault lines near an addressUSGS-mapped earthquake faults within 5 miles, their age and slip rate, and the USGS seismic hazard value.
- Power lines near an addressHigh-voltage transmission lines within 1 mile from federal maps, with voltage and distance.
- Flood zone lookupThe FEMA flood zone mapped at any US address. Not an official flood zone determination.
- Superfund sites near an addressThe nearest EPA Superfund (NPL) sites and their status.
All of these, plus wetlands, FEMA hazard ratings and the federal contamination lists, are in the Environmental Records Report for any US address ($29).
Radon in every New York county · Radon map of every state
Data compiled 2026-10-20. County FIPS 36005. County-level screening information, not a radon measurement of any building.