Home/Middlesex County, MA
Massachusetts -- population 1,629,857

Middlesex County, MA 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

Middlesex County, MA hazard summary: FEMA National Risk Index rated Relatively High; EPA radon zone 1 of 3; most frequently recorded hazard is thunderstorm wind (295 events, 2015-2024).

Radon Risk

Zone 1 -- highest potential. EPA predicts an average indoor radon screening level greater than 4 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

Middlesex County has 660,814 housing units. About 59% 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
5,049
2010-2019
46,486
2000-2009
44,100
1990-1999
46,260
1980-1989
62,586
1970-1979
66,608
1960-1969
69,729
1950-1959
74,497
1940-1949
31,407
1939 or earlier
214,092

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

Ice StormVery High
Inland FloodingRelatively High
LightningRelatively High
EarthquakeRelatively Moderate
Heat WaveRelatively Moderate
Source: FEMA National Risk Index

Recorded Storm History (2015-2024)

NOAA recorded 495 storm events in Middlesex County between 2015 and 2024. This is actual event history, not a risk model -- the counts below are individually logged storms, not a prediction.

Thunderstorm Wind
295
Flood
107
Hail
47
Flash Flood
31
Lightning
12
Tornado
3
Source: NOAA National Centers for Environmental Information, Storm Events Database

Guides Relevant to This County's Housing Stock

Can You Negotiate Radon Mitigation After Inspection?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?

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 Middlesex 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.