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Radon Levels in Lehigh County, Pennsylvania

EPA puts Lehigh 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
39.8%of 3,103 tests reported to CDC (2020) 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

Lehigh County, At a glance

Lehigh 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Lehigh County, 2020

Tests reported
3,103
At or above 4 pCi/L
39.8%
Median result
2.7 pCi/L
Reported results by concentration band, Lehigh County, 2020
Under 2 pCi/L: 39%2 to 4 pCi/L: 21%4 pCi/L and above: 40%

Of 3,103 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Lehigh County, 2020: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1,21739.2%
2 to 4 pCi/L65020.9%
4 pCi/L and above1,23639.8%

CDC publishes this figure only for counties here, so there is no state or national number to compare Lehigh County, Pennsylvania 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 2020: a percentage there is a share of radon tests reported to CDC for Lehigh County in 2020, 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 Lehigh 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 (3,103 for 2020). The median is the middle result of those tests, not of buildings. CDC also reports the number of buildings tested (2,015), a different count, so the two totals are not interchangeable.

Lehigh 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 2020, counting radon tests reported to CDC, not homes. Lehigh 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. Every Pennsylvania county’s own figure is in the Pennsylvania county table.

Measured: CDC tracking data. Figure above: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).

Lehigh County, State data

Pennsylvania's own radon test data

Measured

What Pennsylvania's own agencies publish about radon tests in Lehigh County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Pennsylvania DEP reports for the ZIP codes in Lehigh County

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 36 ZIP codes that lie wholly or partly in Lehigh County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Lehigh County
ZIP codeWhat the state reports
18011Basement: average 5.4 pCi/L, 870 tests; First floor: average 3.9 pCi/L, 68 tests
18015Basement: average 6.9 pCi/L, 4,055 tests; First floor: average 4.2 pCi/L, 686 tests
18017Basement: average 6.6 pCi/L, 9,647 tests; First floor: average 3.8 pCi/L, 1,380 tests
18018Basement: average 5.8 pCi/L, 4,815 tests; First floor: average 3.0 pCi/L, 561 tests
18031Basement: average 12.6 pCi/L, 2,419 tests; First floor: average 6.8 pCi/L, 195 tests
18032Basement: average 7.1 pCi/L, 928 tests; First floor: average 3.5 pCi/L, 85 tests
18034Basement: average 7.4 pCi/L, 2,455 tests; First floor: average 6.1 pCi/L, 254 tests
18036Basement: average 20.1 pCi/L, 4,175 tests; First floor: average 17.6 pCi/L, 519 tests
18037Basement: average 10.9 pCi/L, 1,344 tests; First floor: average 6.5 pCi/L, 107 tests
18041Basement: average 4.8 pCi/L, 647 tests; First floor: average 2.7 pCi/L, 126 tests
18046Basement: figures not shown; First floor: figures not shown
18049Basement: average 8.3 pCi/L, 4,361 tests; First floor: average 4.5 pCi/L, 577 tests
18051Basement: average 20.4 pCi/L, 1,508 tests; First floor: average 9.3 pCi/L, 247 tests
18052Basement: average 8.0 pCi/L, 3,481 tests; First floor: average 4.0 pCi/L, 352 tests
18053Basement: average 27.5 pCi/L, 405 tests; First floor: average 12.1 pCi/L, 37 tests
18059Basement: average 15.1 pCi/L, 294 tests; First floor: average 5.8 pCi/L, 36 tests
18062Basement: average 6.6 pCi/L, 6,051 tests; First floor: average 4.2 pCi/L, 599 tests
18065Basement: average 15.3 pCi/L, 44 tests; First floor: figures not shown
18066Basement: average 21.0 pCi/L, 1,323 tests; First floor: average 6.6 pCi/L, 195 tests
18069Basement: average 17.0 pCi/L, 2,589 tests; First floor: average 9.5 pCi/L, 196 tests
18078Basement: average 18.1 pCi/L, 2,029 tests; First floor: average 13.2 pCi/L, 178 tests
18079Basement: figures not shown; First floor: figures not shown
18080Basement: average 19.6 pCi/L, 1,691 tests; First floor: average 7.9 pCi/L, 223 tests
18087Basement: average 4.5 pCi/L, 68 tests; First floor: figures not shown
18092Basement: average 14.1 pCi/L, 786 tests; First floor: average 10.0 pCi/L, 102 tests
18101Basement: average 4.9 pCi/L, 226 tests; First floor: average 1.1 pCi/L, 60 tests
18102Basement: average 5.2 pCi/L, 1,689 tests; First floor: average 2.5 pCi/L, 194 tests
18103Basement: average 7.1 pCi/L, 6,882 tests; First floor: average 4.8 pCi/L, 827 tests
18104Basement: average 6.8 pCi/L, 11,051 tests; First floor: average 4.2 pCi/L, 1,229 tests
18106Basement: average 8.4 pCi/L, 1,908 tests; First floor: average 4.3 pCi/L, 190 tests
18109Basement: average 5.1 pCi/L, 872 tests; First floor: average 2.7 pCi/L, 74 tests
18195Basement: figures not shown
18951Basement: average 4.6 pCi/L, 5,103 tests; First floor: average 2.1 pCi/L, 1,063 tests
19529Basement: average 23.0 pCi/L, 445 tests; First floor: average 8.0 pCi/L, 63 tests
19530Basement: average 18.7 pCi/L, 1,541 tests; First floor: average 9.2 pCi/L, 348 tests
19539Basement: average 10.7 pCi/L, 567 tests; First floor: average 7.1 pCi/L, 61 tests
  • DEP's report gives the number of tests, the highest result and the average result for each floor tested; it states no period.
  • DEP says the smartest thing to do is to test your home for radon, no matter where you live.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Pennsylvania DEP data, Period not stated by DEP.

Radon Action Brief

National Radon Action MonthPre-sale

Lehigh 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 Lehigh County BriefSee a free sample

Area data, not a test of the building.

Local help

Lehigh County, Local resources

Radon testing and mitigation in Lehigh County

Who tests and fixes radon in Lehigh County: listed businesses, Pennsylvania's radon program and test kits.

Listed radon businesses with an address in Lehigh County:

Listed radon professionals by town: Allentown, Emmaus, Macungie

What Pennsylvania's program says
Phone
800-237-2366
Licensing of radon professionals
The Radon Certification Act requires DEP to establish by regulation, a certification program for persons conducting radon gas and radon progeny testing, laboratory analysis and mitigation...

What it means

Lehigh County, Questions

Questions about radon in Lehigh County

Common questions

8 questions, answered from the figures above

Who does radon mitigation in Lehigh County?

No listed mitigator names Lehigh County as a service area yet; the Pennsylvania directory lists 153 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 Pennsylvania requires one.

Radon mitigation: how it worksRadon mitigation costRadon mitigation systemsMitigators in Pennsylvania

How do I get a radon test in Lehigh 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 Lehigh County or names it as a service area yet. The Pennsylvania 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 checklistPennsylvania radon program

Are radon levels high in Lehigh County?

In 2020, 39.8% of the radon tests reported to CDC for Lehigh County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. That is a share of reported tests, not of homes. EPA places Lehigh 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 Pennsylvania

What EPA radon zone is Lehigh County in?

EPA places Lehigh County, Pennsylvania 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 Lehigh 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 Lehigh County?

Lehigh 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 Lehigh County, Pennsylvania in 2020. They describe tests other people carried out in other buildings, and none of them measures yours.

Lehigh County in figures

The figures above, said in words

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

    • Predicted

      Predicted

      EPA places Lehigh County in Zone 1, highest predicted potential, as it does 48 other counties of Pennsylvania's 67.

      Of the 6 bordering counties, EPA places Berks County, Bucks County, Carbon County, Montgomery County, Northampton County and Schuylkill County in Zone 1.

  • Reported tests

    Measured

    CDC has annual figures for Lehigh County for 7 years, 2014 to 2020. In 2020, 39.8% of 3,103 reported tests were at or above 4 pCi/L.

    Across those years the share ranged from 39.8% (2020) to 46.5% (2014). Few tests in a year can move it a long way.

  • Local record

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

    The county's largest incorporated places are Allentown, Bethlehem and Emmaus; the figures here cover them as part of the county.

Products

Lehigh County, Products

Testing and mitigation products

Whatever the figures for Lehigh 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.

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

Testing

5

Mitigation

3

Explore

Lehigh County, Bordering counties

Counties bordering Lehigh County

Calculated by Radon411
Why bordering counties matter

6 counties share a boundary with Lehigh 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.

Lehigh County, Cities and towns

Cities and towns in Lehigh County

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

  • Bethlehem (part)
  • Emmaus
  • Catasauqua
  • Fountain Hill
  • Slatington
  • Coplay
  • Macungie
  • Alburtis
  • Coopersburg

10 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county.

Lehigh 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.