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Radon Levels in Sussex County, New Jersey

EPA puts Sussex County in Zone 1, its highest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

Predicted
Zone 1Highest predicted potential
Measured
22.3%of 4,116 tests reported to CDC (2022) were at or above 4 pCi/L
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

The data

Sussex County, At a glance

Sussex County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.

What EPA predicts hereScreening level, geology

EPA predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county as a whole.

USGS geologic potential: High across 81% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Sussex County, 2022

Tests reported
4,116
At or above 4 pCi/L
22.3%
Median result
1.5 pCi/L
Reported results by concentration band, Sussex County, 2022
Under 2 pCi/L: 59%2 to 4 pCi/L: 19%4 pCi/L and above: 22%

Of 4,116 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Sussex County, 2022: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2,42058.8%
2 to 4 pCi/L77918.9%
4 pCi/L and above91722.3%

CDC publishes this figure only for counties here, so there is no state or national number to compare Sussex County, New Jersey with.

What these figures count

Distribution of radon tests reported to CDC, not this house. People testing before a sale, or because they suspect a problem, are over-represented in any reported testing data.

The figures at the top are for 2022: a percentage there is a share of radon tests reported to CDC for Sussex County in 2022, and a percentage in a view below is a share of the tests reported for the year or period it names. It is not a share of homes in Sussex County, and it is not a random sample: it counts only the tests people chose to run and that were reported.

CDC works out the shares and the median over pre-mitigation tests, counting a test not marked as before or after mitigation as one of them (4,116 for 2022). The median is the middle result of those tests, not of buildings. CDC also reports the number of buildings tested (2,564), a different count, so the two totals are not interchangeable.

Sussex County's own published CDC figures beside those of the counties that border it, for the same period.

Each figure is that county’s own published CDC figure for 2022, counting radon tests reported to CDC, not homes. Sussex County is this page. Nothing is averaged or combined across counties. The test count beside each county is CDC’s published number of pre-mitigation tests behind its figures. Figures from few tests can swing widely from year to year. No published CDC figure for 2022: Pike County, PA; Orange County, NY; Monroe County, PA. Every New Jersey county’s own figure is in the New Jersey county table.

Measured: CDC tracking data. Figure above: 2022. Measured data period: 2014 to 2022 (every CDC figure on file).

Radon Action Brief

National Radon Action MonthPre-sale

Sussex County's radon brief, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get the Sussex County BriefSee a free sample

Area data, not a test of the building.

Local help

Sussex County, Local resources

Radon testing and mitigation in Sussex County

Who tests and fixes radon in Sussex County: listed businesses, New Jersey's radon program and test kits.

What New Jersey's program says
Phone
800-648-0394
Licensing of radon professionals
By law, all businesses and professionals conducting radon testing and mitigation in New Jersey must be certified by the DEP.
Disclosure when a home is sold or rented
Under the law, the seller must provide the buyer, at the time the contract of sale is entered into, with a copy of the results of the radon test and evidence of any mitigation or treatment.

What it means

Sussex County, Questions

Questions about radon in Sussex County

Common questions

8 questions, answered from the figures above

Who does radon mitigation in Sussex County?

No listed mitigator names Sussex County as a service area yet; the New Jersey directory lists 15 companies. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional. Your state radon program is the place to check whether New Jersey requires one.

Radon mitigation: how it worksRadon mitigation costRadon mitigation systemsMitigators in New Jersey

Are radon levels high in Sussex County?

In 2022, 22.3% of the radon tests reported to CDC for Sussex County, New Jersey were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. That is a share of reported tests, not of homes. EPA places Sussex County in Zone 1, highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. Homes with elevated levels occur in all three zones, so the figures describe the area, not your house. Testing is the only way to know the radon level in a specific building.

Radon levels: what a result meansWhat is radon?Radon levels in New Jersey

How do I get a radon test in Sussex County?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. No radon testing business listed on Radon411 has an address in Sussex County or names it as a service area yet. The New Jersey radon program is the place to ask about certified testers and any test kit offer it runs.

Radon testing: how to test a homeRadon test kits comparedFree and low-cost kits by stateRadon Action Month checklistNew Jersey radon program

What EPA radon zone is Sussex County in?

EPA places Sussex County, New Jersey in Zone 1, which EPA describes as highest predicted potential for the area. A zone is a prediction for the whole county and never determines whether a particular home should be tested. EPA recommends testing every home regardless of zone.

Should I test my home in Sussex County?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

When is the best time of year to test?

EPA says short-term tests stay in the home from 2 to 90 days and that all radon tests should run a minimum of 48 hours; long-term tests stay more than 90 days. EPA's guides do not name a best season: they say radon levels tend to vary from day to day and season to season, so a long-term test is more likely than a short-term test to tell you the year-round average.

What does it cost to test?

EPA's Citizen's Guide calls testing easy and inexpensive, and EPA's Home Buyer's and Seller's Guide says passive short-term and long-term devices are generally inexpensive, while active devices may cost more. No national average price is published for this, so Radon411 does not give one. What testing costs.

Which counties border Sussex County?

Sussex County borders 6 counties, derived from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county's report can be relevant.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The reported-test figures on this page describe Sussex County, New Jersey in 2022. They describe tests other people carried out in other buildings, and none of them measures yours.

Sussex County in figures

The figures above, said in words

What the published data says about Sussex County, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places Sussex County in Zone 1, highest predicted potential, as it does 6 other counties of New Jersey's 21.

      Of the 6 bordering counties, EPA places Monroe County, PA, Morris County, Orange County, NY and Warren County in Zone 1 and Passaic County and Pike County, PA in Zone 2.

  • Reported tests

    Measured

    CDC has annual figures for Sussex County for 9 years, 2014 to 2022. In 2022, 22.3% of 4,116 reported tests were at or above 4 pCi/L.

    Across those years the share ranged from 22.3% (2022) to 29.1% (2016). Few tests in a year can move it a long way.

  • Local record

    New Jersey's radon program is the Radon Section, run by New Jersey Department of Environmental Protection; its contacts are under Local resources.

    The county's largest incorporated places are Hopatcong, Newton and Franklin; the figures here cover them as part of the county.

Products

Sussex County, Products

Testing and mitigation products

Whatever the figures for Sussex County show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Sussex County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Sussex County

Testing

5

Mitigation

3

Explore

Sussex County, Bordering counties

Counties bordering Sussex County

Calculated by Radon411
Why bordering counties matter

6 counties share a boundary with Sussex County, computed from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county’s report can be worth reading alongside this one.

Sussex County, Cities and towns

Cities and towns in Sussex County

The radon figures on this page are for Sussex County as a whole. They do not differ by city or town.

  • Hopatcong
  • Newton
  • Franklin
  • Stanhope
  • Hamburg
  • Ogdensburg
  • Sussex
  • Branchville
  • Andover

9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files.

Sussex County, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement and mitigation professionals by state, with their certifications.Find a professional

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.