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Radon in Freehold, New Jersey

EPA puts Monmouth County, where Freehold is, in Zone 1, its highest radon zone, and most reported tests there come back low, though 9.8% of 9,745 (2022) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    9.8%

    0.1 pts above NJ

    Monmouth
    9.8%
    New Jersey
    9.7%

    Monmouth, 9th of 21 in NJ, 2022

  • Median result

    0.7pCi/L

    Below action level

    Monmouth
    0.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Monmouth's tests, 2022

  • Nearest county

    7.3%

    Middlesex, 14 miles

    Middlesex
    7.3%
    Monmouth
    9.8%

    9,594 tests, 2022

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    Monmouth, where Freehold is

  • Tests reported

    9,745

    In Monmouth

    Monmouth
    9,745
    Middlesex
    9,594

    Reported to CDC before any fix, 2022

Read a result for Freehold

Starts at Monmouth County's median, 0.7 pCi/L

0.7pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 0.7 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Monmouth County's median reported result, 2022.

Interpret this reading

The data

Freehold, What is published

What is published for Freehold

Information:

Every figure for Freehold is a county's

Radon data is published by county, not by city, so for Freehold it is Monmouth County's: its EPA zone (Zone 1) and the 9,745 tests reported to CDC for 2022. Only a test tells you about one home.

Freehold covers 1.9 square miles of land, all of it in Monmouth County. Its 12,562 residents live 6,501 to the square mile.

Freehold, Counties

The county Freehold lies in

Measured

Monmouth County's EPA zone and the figures CDC publishes for it, 2022.

Monmouth CountyZone 1Highest predicted potential

9.8%
Reported tests at or above 4 pCi/L
0.7 pCi/L
Median reported result
9,745 tests
Tests reported to CDC
9
Annual years on file

Monmouth County ranks 9th of 21 New Jersey counties with 30 or more tests for that period, 0.1 points above the 9.7% pooled across New Jersey's counties, 14.1 points below the national pool of 23.9%.

The counties nearest Freehold with a CDC figure for 2022, measured from the middle of the city: Middlesex County (14 miles, 7.3% of 9,594 tests), Mercer County (23 miles, 10.6% of 6,370 tests) and Ocean County (26 miles, 1.8% of 2,604 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 1.8% to 15.4%; the farthest of them, Essex County, is 36 miles away at 4.1%.

The directory lists 2 businesses with an address in Freehold, 2 for testing. New Jersey's other cities with a page of their own: Trenton.

The counties around Freehold

By distance from the middle of Freehold; counties with 30 or more tests.

Nearest counties to Freehold with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Middlesex County14 mi9,5947.3%0.8 pCi/L
Mercer County23 mi6,37010.6%0.9 pCi/L
Ocean County26 mi2,6041.8%0.5 pCi/L
Somerset County28 mi7,67915.4%1.2 pCi/L
Union County28 mi6,1115.1%0.9 pCi/L
Burlington County34 mi5,3556.2%0.9 pCi/L
Hudson County34 mi2,6553.4%0.5 pCi/L
Essex County36 mi8,3414.1%0.7 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2022.

Freehold, Geology

The ground under Freehold

Predicted

USGS's geologic map puts all of Freehold's mapped land in one class: low radon potential. All of it lies in the area the map calls Outer Coastal Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Freehold
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Outer Coastal PlainUpper Tertiary-Quaternary gravel, sand, silt, clay.Low8100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Freehold beside its county and New Jersey

Monmouth County as a whole has 36.5% of its land rated moderate; none of that ground lies under Freehold. Across New Jersey 29.8% of the land is rated high; none of Freehold's is.

Share of land by USGS radon potential: Freehold, the county it lies in and New Jersey
AreaEPA zoneLow potentialModerate potentialHigh potential
FreeholdBy county100%NoneNone
Monmouth CountyZone 160.3%36.5%None
New Jersey21 counties, pooled by land areaVaries53.8%13.8%29.8%

The map rates the ground, not the air in any home.

Freehold, Homes

Homes in Freehold

Fewer than six in ten of Freehold's 4,437 homes are detached houses (55%, against 66% across Monmouth County); the rest are attached, in shared buildings or mobile. The homes are older than Monmouth County's as a whole: half were built before 1963 (1975 for Monmouth County), and 47% date from before 1960. 50% of occupied homes are lived in by their owner (Monmouth County: 75%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Freehold, Monmouth County, New Jersey, 2019 to 2023
HomesFreeholdMonmouth CountyNew Jersey
Housing units4,437269,7283,775,842
Detached houses55%66%53%
In buildings of 5 or more23%17%22%
Mobile homes1%1%1%
Built before 196047%30%38%
Built since 20006%16%15%
Middle year built196319751969
Owner-occupied50%75%64%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.

Local help

Freehold, Professionals

Radon professionals listed in Freehold

Businesses whose listed city is Freehold, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.

2 listings with Freehold as the city. See radon testing in Freehold, or all radon professionals in New Jersey.

Freehold, Local resources

Local resources for Freehold

Who to ask in New Jersey: its radon program, test kits and professionals.

The program's own words on licensing and disclosure are on the New Jersey page.

What it means

Freehold, Questions

Questions about radon in Freehold

What radon zone is Freehold in?

Freehold has no zone of its own: it shares Monmouth County's, Zone 1, the map's highest class: a predicted county average above 4 pCi/L.

What are radon levels in Freehold?

Only 9.8% of 9,745 tests from Monmouth County for 2022 reached 4 pCi/L, so reported levels around Freehold run low. The median reported result was 0.7 pCi/L. Low is not none.

Should I test my home in Freehold?

Yes, even here. 955 of 9,745 tests reported from Monmouth County were at or above 4 pCi/L. That is about what New Jersey as a whole reports (9.7%), and ranks Monmouth County 9th of the 21 New Jersey counties with 30 or more tests. Those homes were found by testing, not by the county's low share. How to test a home.

What ground is Freehold built on, as far as radon goes?

USGS's geologic map puts all of Freehold on one named area, "Outer Coastal Plain", rated low for radon potential, radon index 8.

Is radon higher in the counties around Freehold?

Some are and some are not. Against Monmouth County's 9.8%, 2 of the 8 nearest counties with a figure report more and 6 less, from Ocean County (1.8%, 26 miles off) to Somerset County (15.4%, 28 miles off).

Who tests for or fixes radon in Freehold?

Radon411's directory has 2 businesses with an address in Freehold, all listed for testing, none for mitigation. Every entry names the public list it was taken from. Radon professionals in Freehold.

The answers use the published figures of Monmouth County, the county Freehold lies in.

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