Home/Bronx County, NY
New York -- population 1,471,631

Bronx County, NY Property Research

Real data from four public sources, not an internal estimate: the EPA's radon zone classification, Census housing-age records, FEMA's natural hazard risk index, and NOAA's recorded storm history for this county. Every figure below links to where it actually comes from.

Hazard Summary

Bronx County, NY hazard summary: FEMA National Risk Index rated Relatively High; EPA radon zone 3 of 3; most frequently recorded hazard is flash flood (23 events, 2015-2024).

Radon Risk

Zone 3 -- low potential. EPA predicts an average indoor radon screening level below 2 pCi/L for this county.

This is a county-wide prediction from geology and soil data, not a measurement of any specific home -- EPA recommends testing every home regardless of zone. See our guide on negotiating radon mitigation after inspection.

Source: EPA Map of Radon Zones

Housing Age

Bronx County has 553,231 housing units. About 71% were built in 1969 or earlier -- old enough that knob-and-tube wiring, lead-based paint, and galvanized supply lines are all realistic possibilities worth checking for, not just a general inspection line item.

2020 or later
2,208
2010-2019
29,611
2000-2009
31,765
1990-1999
24,565
1980-1989
24,393
1970-1979
46,169
1960-1969
74,323
1950-1959
74,761
1940-1949
55,655
1939 or earlier
189,781

Does knob-and-tube wiring have to be replaced before closing?

Source: U.S. Census Bureau, ACS 5-Year Estimates, Table B25034

Natural Hazard Risk

FEMA rates Bronx County's overall natural hazard risk as Relatively High, relative to the rest of the country.

Heat WaveRelatively High
Cold WaveVery High
Strong WindVery High
Winter WeatherVery High
Inland FloodingRelatively High
Source: FEMA National Risk Index

Recorded Storm History (2015-2024)

NOAA recorded 76 storm events in Bronx County between 2015 and 2024. This is actual event history, not a risk model -- the counts below are individually logged storms, not a prediction.

Flash Flood
23
Winter Weather
15
Thunderstorm Wind
11
Winter Storm
9
High Wind
7
Heavy Snow
6
Flood
3
Strong Wind
2
Source: NOAA National Centers for Environmental Information, Storm Events Database

Guides Relevant to This County's Housing Stock

Does a Standard Home Inspection Check for Asbestos?Can Cast Iron Sewer Pipes Fail a Standard Home Inspection?Can I buy a house with knob-and-tube wiring?Can You Get Homeowners Insurance with Knob and Tube Wiring?Does Knob and Tube Wiring Have to Be Replaced Before Closing?What Is a Federal Pacific Stab-Lok Panel and Why Inspectors Flag It?

Get Your Free Property Report

BeforeRegret pulls live seismic hazard data, validates the address, and builds era- and county-specific inspection priorities and seller questions into one report -- with anything not yet independently verified clearly labeled, not guessed at.

Get Your First Report Free

This page reports what these four public agencies have published for Bronx County as a whole -- it is not an assessment of any specific address or property, and does not replace a licensed home inspection, radon test, or insurance review for a specific home. Data last checked August 10, 2026.