Is radon high in Sussex County, New Jersey?

Moderate. The model predicts a long-term basement average of 2.3 pCi/L in Sussex County (about 1.3× the US average of 1.8 and about 1.8× the New Jersey average of 1.3). That is in the 2-4 pCi/L range where the EPA recommends considering mitigation. Ranked 2 of 21 New Jersey counties.

Should I test for radon in Sussex County?

Yes, soon. With a predicted average of 2.3 pCi/L, many homes in Sussex County will test above the 4 pCi/L action level. Use a short-term kit first; if it reads 2 or higher, confirm with a long-term test or continuous monitor before deciding on mitigation.

What does EPA Radon Zone 1 mean for Sussex County?

Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 2.3 pCi/L does not line up with Zone 1, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

How much does radon mitigation cost in Sussex County?

A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; New Jersey quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

Radon levels in Sussex County, New Jersey

ModerateEPA Zone 1

Predicted long-term basement average of 2.3 pCi/L (model estimate) across 18 ZIP codes - about 1.3× the US average of 1.8, about 1.8× the New Jersey average of 1.3. Ranked #2 of 21 New Jersey counties.

Test Sussex County, NJ - the EPA says "consider fixing" in this range

The predicted basement average here is 2.3 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.

Get a short-term test kit →Or track it with a continuous monitor

Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

2.3 ± 0.06

pCi/L predicted basement mean (model SD)

1.6 ± 0.07

pCi/L predicted upstairs (above-ground) mean

1.8-2.6

range of ZIP-level basement predictions in the county

What this means for Sussex

The typical Sussex County home is predicted in the 2-4 pCi/L band. The EPA's guidance for this range is to consider fixing, because there is no known safe level and roughly one home in several in a moderate area will test above 4.

Note that the EPA classifies Sussex County as Zone 1 while the newer model predicts 2.3 pCi/L. The zone map predates two decades of test data; where they disagree, we grade on the model but show both. County figures weight each ZIP by its 2010 Census population, so they describe where people live rather than empty land.

Comparable New Jersey counties: Warren County (2.3), Hunterdon County (2.1), Morris County (1.8), Somerset County (1.7). The state's highest is Warren County at 2.3 pCi/L.

ZIP codes in Sussex County

Predicted basement and upstairs means by ZIP (model estimate). ZIPs whose land is mostly in this county.

ZIP	Basement	Upstairs	Grade
07860	2.5 ± 0.06	1.8	Moderate
07871	2.1 ± 0.09	1.7	Moderate
07461	2.4 ± 0.06	1.7	Moderate
07843	2.3 ± 0.05	1.5	Moderate
07821	2.4 ± 0.06	1.7	Moderate
07419	2.1 ± 0.06	1.5	Moderate
07874	2.2 ± 0.06	1.5	Moderate
07462	2.0 ± 0.05	1.3	Low
07422	2.5 ± 0.06	1.7	Moderate
07826	2.5 ± 0.05	1.8	Moderate
07416	2.3 ± 0.06	1.5	Moderate
07848	2.5 ± 0.06	1.7	Moderate
07827	1.9 ± 0.05	1.1	Low
07460	2.6 ± 0.06	1.8	Moderate
07439	2.2 ± 0.06	1.5	Moderate
07418	2.0 ± 0.06	1.5	Low
07822	2.3 ± 0.06	1.5	Moderate
07851	1.8 ± 0.06	1.0	Low

If your test comes back at 4 pCi/L or higher

Mitigation is a routine job: a fan-driven pipe that vents soil gas from under the slab to above the roofline, typically $800-$2,500 installed (typical range; local quotes vary). Use certified professionals: EPA find-a-professional. Read the full mitigation guide.

Sussex County radon questions

Is radon high in Sussex County, New Jersey?: Moderate. The model predicts a long-term basement average of 2.3 pCi/L in Sussex County (about 1.3× the US average of 1.8 and about 1.8× the New Jersey average of 1.3). That is in the 2-4 pCi/L range where the EPA recommends considering mitigation. Ranked 2 of 21 New Jersey counties.
Should I test for radon in Sussex County?: Yes, soon. With a predicted average of 2.3 pCi/L, many homes in Sussex County will test above the 4 pCi/L action level. Use a short-term kit first; if it reads 2 or higher, confirm with a long-term test or continuous monitor before deciding on mitigation.
What does EPA Radon Zone 1 mean for Sussex County?: Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and classifies whole counties. The newer model's predicted average of 2.3 pCi/L does not line up with Zone 1, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.
How much does radon mitigation cost in Sussex County?: A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; New Jersey quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

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