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Radon in Malvern, Pennsylvania

EPA puts Chester County, where Malvern is, in Zone 1, its highest radon zone, and 24.0% of its 6,770 reported radon tests (2020) were at or above 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

    24.0%

    6.3 pts below PA

    Chester
    24.0%
    PA
    30.3%

    Chester, 55th of 63 in PA, 2020

  • Median result

    2.0pCi/L

    Below action level

    Chester
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Chester's tests, 2020

  • Nearest county

    14.7%

    Delaware, 10 miles

    Delaware
    14.7%
    Chester
    24.0%

    6,041 tests, 2020

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    Chester, where Malvern is

  • Tests reported

    6,770

    In Chester

    Chester
    6,770
    Delaware
    6,041

    Reported to CDC before any fix, 2020

Read a result for Malvern

Starts at Chester County's median, 2.0 pCi/L

2.0pCi/L

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

EPA’s reading of 2.0 pCi/L

Between 2 and 4 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Chester County's median reported result, 2020.

Interpret this readingWhat a fix costs

The data

Malvern, What is published

What is published for Malvern

Information:

Every figure for Malvern is a county's

Radon data is published by county, not by city, so for Malvern it is Chester County's: its EPA zone (Zone 1) and the 6,770 tests reported to CDC for 2020. Only a test tells you about one home.

Malvern covers 1.3 square miles of land, all of it in Chester County. About 3,427 people live there, 2,719 to the square mile.

Malvern, Counties

The county Malvern lies in

Measured

Chester County's EPA zone and the figures CDC publishes for it, 2020.

Chester CountyZone 1Highest predicted potential

24.0%
Reported tests at or above 4 pCi/L
2.0 pCi/L
Median reported result
6,770 tests
Tests reported to CDC
7
Annual years on file

Chester County ranks 55th of 63 Pennsylvania counties with 30 or more tests for that period, 6.3 points below the 30.3% pooled across Pennsylvania's counties, 1.5 points below the national pool of 25.5%.

Measured from the middle of Malvern, the nearest counties with a CDC figure for 2020 are Delaware County (10 miles, 14.7% of 6,041 tests), Montgomery County (15 miles, 21.8% of 10,508 tests) and Philadelphia County (20 miles, 10.6% of 8,442 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 10.6% to 43.3%; the farthest of them, Northampton County, is 51 miles away at 41.3%.

No business in the directory gives Malvern as its address; the Pennsylvania list covers it. Pennsylvania's other cities with a page of their own: Pittsburgh, Allentown, Scranton and Harrisburg.

The counties around Malvern

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

Nearest counties to Malvern with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Delaware County10 mi6,04114.7%1.8 pCi/L
Montgomery County15 mi10,50821.8%2.0 pCi/L
Philadelphia County20 mi8,44210.6%1.7 pCi/L
Bucks County30 mi7,06623.2%2.0 pCi/L
Berks County34 mi2,63239.6%2.9 pCi/L
Lancaster County39 mi4,39843.3%3.0 pCi/L
Lehigh County40 mi3,10339.8%2.7 pCi/L
Northampton County51 mi3,43441.3%2.9 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2020.

Malvern, Geology

The ground under Malvern

Predicted

USGS's geologic map puts all of Malvern's mapped land in one class: high radon potential. All of it lies in the area the map calls Piedmont Lowland, to which USGS gives a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Malvern
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Piedmont LowlandMica schist, phyllite, hornblende gneiss, and marble.High14100%

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

Malvern beside its county and Pennsylvania

The ground under Malvern is close to Chester County's as a whole: 100% rated high against 99.9%. Malvern has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%.

Share of land by USGS radon potential: Malvern, the county it lies in and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
MalvernBy countyNoneNone100%
Chester CountyZone 1None0.1%99.9%
Pennsylvania67 counties, pooled by land areaVaries0.7%28.9%70.4%

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

Malvern, Homes

Homes in Malvern

Fewer than six in ten of Malvern's 1,752 homes are detached houses (30%, against 60% across Chester County); the rest are attached, in shared buildings or mobile. The homes are older than Chester County's as a whole: half were built before 1973 (1983 for Chester County), and 36% date from before 1960. 54% of occupied homes are lived in by their owner (Chester County: 75%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Malvern, Chester County, Pennsylvania, 2019 to 2023
HomesMalvernChester CountyPennsylvania
Housing units1,752210,7305,779,663
Detached houses30%60%57%
In buildings of 5 or more27%14%13%
Mobile homes0%2%4%
Built before 196036%23%45%
Built since 200015%25%14%
Middle year built197319831965
Owner-occupied54%75%69%

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

Local help

Malvern, Local resources

Local resources for Malvern

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

The program's own words on licensing are on the Pennsylvania page.

What it means

Malvern, Questions

Questions about radon in Malvern

What radon zone is Malvern in?

EPA's map puts Chester County, and with it Malvern, in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.

What are radon levels in Malvern?

Most tests near Malvern come back under EPA's action level, but not all: 24.0% of Chester County's 6,770 tests for 2020 were at or above 4 pCi/L. The median reported result was 2.0 pCi/L.

Should I test my home in Malvern?

Yes. In Chester County, about one reported test in 4 reached 4 pCi/L. That is below Pennsylvania's pooled 30.3%, and still not a reason to skip it, and ranks Chester County 55th of the 63 Pennsylvania counties with 30 or more tests. The number for one house comes only from testing it. How to test a home.

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

USGS's geologic map puts all of Malvern on one named area, "Piedmont Lowland", rated high for radon potential, radon index 14.

Is radon higher in the counties around Malvern?

It depends which way you go. 4 of the 8 nearest counties with a figure report a larger share than Chester County's 24.0% and 4 a smaller one: from Philadelphia County (10.6%, 20 miles off) to Lancaster County (43.3%, 39 miles off).

The answers use the published figures of Chester County, the county Malvern lies in.

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