Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Perry County, Pennsylvania
EPA puts Perry County in Zone 1, its highest radon zone, and high results are common there: 57.7% of the 189 radon tests reported to CDC (2020) came back 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
Share at 4+ pCi/L
57.7%
27.4 pts above PA
- Perry
- 57.7%
- PA
- 30.3%
189 tests, 2020
Median result
4.9pCi/L
Action level reached
- Perry
- 4.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
189
44th of 63 by tests
- Perry
- 189
- Montgomery
- 10,508
Reported to CDC before any fix, 2020
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in PA
1 of 63
Top quarter
- Perry
- 57.7%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Perry County
Starts at Perry County's median, 4.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.9 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Perry County's median reported result, 2020.
The data
Perry County, At a glance
Perry County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Perry County in
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 Perry County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.4% |
| 2015 | 60.3% |
| 2016 | 47.1% |
| 2017 | 56.7% |
| 2018 | 50.9% |
| 2019 | 50.7% |
| 2020 | 57.7% |
2020: 57.7%. Across these years the share ran from 47.1% to 60.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 189 tests reported to CDC for Perry County over 2020, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).
Perry County, Compared
Perry County radon figures, compared
Calculated by Radon411More than half: 57.7% of the 189 radon tests reported to CDC for Perry County in 2020 read at least 4 pCi/L. That places it 1st of 63 Pennsylvania counties with 30 or more tests for the same period. That is 27.4 points above the 30.3% pooled from 67 Pennsylvania counties.
The median result, 4.9 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 132.9 pCi/L. The rest split 28.6% under 2 pCi/L and 13.8% from 2 to 4 (Pennsylvania: 44.3% and 25.4%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 57.7% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Juniata County at 52.9%, the lowest Dauphin County at 36.9%. Statewide for the same period, Lebanon County reported the highest share (54.2%) and Philadelphia County the lowest (10.6%).
The busiest year on file was 2016, with 340 tests reported; the quietest, 2020, had 189.
Over 7 years of annual figures the share rose 7.3 points, from 50.4% in 2014 to 57.7% in 2020; its peak was 60.3% in 2015. Nationally, every county with a figure for the same period pools to 25.5%; Perry County sits 32.2 points above it.
Perry CountyPennsylvania, pooled
57.7% % of tests30.3% % of tests
| Year | Tests | Perry County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 258 | 50.4% | 36.1% |
| 2015 | 305 | 60.3% | 37.8% |
| 2016 | 340 | 47.1% | 34.4% |
| 2017 | 270 | 56.7% | 35.1% |
| 2018 | 277 | 50.9% | 30.5% |
| 2019 | 268 | 50.7% | 31.4% |
| 2020 | 189 | 57.7% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Perry County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Perry 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 Perry County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 15 ZIP codes that lie wholly or partly in Perry County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 17006 | Basement: figures not shown; First floor: figures not shown |
| 17020 | Basement: average 18.0 pCi/L, 999 tests; First floor: average 11.4 pCi/L, 158 tests |
| 17021 | Basement: figures not shown; First floor: figures not shown |
| 17024 | Basement: average 15.1 pCi/L, 272 tests; First floor: figures not shown |
| 17035 | Basement: figures not shown; First floor: figures not shown |
| 17037 | Basement: figures not shown; First floor: figures not shown |
| 17040 | Basement: average 13.1 pCi/L, 177 tests; First floor: figures not shown |
| 17045 | Basement: average 18.9 pCi/L, 254 tests; First floor: average 15.8 pCi/L, 42 tests |
| 17047 | Basement: average 15.0 pCi/L, 137 tests; First floor: figures not shown |
| 17053 | Basement: average 19.7 pCi/L, 1,009 tests; First floor: average 10.9 pCi/L, 151 tests |
| 17062 | Basement: average 16.1 pCi/L, 295 tests; First floor: average 7.5 pCi/L, 38 tests |
| 17068 | Basement: average 11.6 pCi/L, 313 tests; First floor: average 9.2 pCi/L, 47 tests |
| 17069 | Basement: figures not shown; First floor: figures not shown |
| 17074 | Basement: average 16.6 pCi/L, 581 tests; First floor: average 5.6 pCi/L, 103 tests |
| 17090 | Basement: average 16.6 pCi/L, 560 tests; First floor: average 13.7 pCi/L, 75 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.
Perry County, Geology
The ground under Perry County
PredictedUSGS's geologic map puts all of Perry County's mapped land in one class: high radon potential. 95.9% of it lies in the area the map calls Appalachian Mountain Section, to which USGS gives a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Appalachian Mountain Section | Paleozoic sandstone, shale, and limestone. | High | 12 | 95.9% |
| Great Valley Section | Sandstone, shale and siltstone. | High | 15 | 4.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Perry County beside the ground around it
Perry County has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%. Of the 5 counties that border it, none has as large a share of high-potential ground; Juniata County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Perry County, Local resources
Radon testing and mitigation in Perry County
Listed radon businesses with an address in Perry County:
- Radon DivisionRadon Division, run by Department of Environmental Protection, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Pennsylvania.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Through an EPA-funded program, hospitals give parents of newborn children a packet of information which includes a coupon for a free radon test kit from the DEP.
- Compare kits
- Professionals in Pennsylvania151 professionals are listed in Pennsylvania.
Listed radon professionals by town: Duncannon
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 of radon contamination in buildings.
What it means
Perry County, Questions
Questions about radon in Perry County
Are radon levels high in Perry County?
In 2020, 57.7% of the radon tests reported to CDC for Perry County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.9 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 30.3%.
Which counties border Perry County?
Perry County borders 5 counties: Juniata County, Cumberland County, Dauphin County, Franklin County and Northumberland County.
Products
Perry County, Products
Testing a home in Perry County
In Perry County, 57.7% of 189 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Perry County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Perry County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Perry County
Explore
Perry County, Bordering counties
Counties bordering Perry County
Calculated by Radon411- Radon levels in Juniata CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.4 pCi/L · 87 tests · 4.8 points below Perry County
- Radon levels in Northumberland CountyEPA zone 1
49.8%at or above 4 pCi/L
Median 3.9 pCi/L · 275 tests · 7.9 points below Perry County
- Radon levels in Cumberland CountyEPA zone 1
43.6%at or above 4 pCi/L
Median 3.1 pCi/L · 2,950 tests · 14.1 points below Perry County
- Radon levels in Franklin CountyEPA zone 1
42.6%at or above 4 pCi/L
Median 3.1 pCi/L · 1,059 tests · 15.1 points below Perry County
- Radon levels in Dauphin CountyEPA zone 1
36.9%at or above 4 pCi/L
Median 2.0 pCi/L · 2,986 tests · 20.8 points below Perry County
Perry County, Cities and towns
Cities and towns in Perry County
The Census Bureau estimates 46,806 residents in Perry County for July 1, 2025, 976 more than in 2020 (+2.1%). That works out to 85 people per square mile of land. No town dominates: Marysville, the largest, has 2,717 residents, 5.8% of the total. Together its 9 incorporated places hold 19.6% of those residents; the other 80.4% live outside any of them. Reported testing is thin here: 189 tests over 2020, or 4.0 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.
From Marysville to New Buffalo, CDC publishes no figure by town: each reads Perry County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Marysville | 2,717 | +2.4% | 5.8% |
| Newport | 1,511 | +1.9% | 3.2% |
| Duncannon | 1,465 | −0.3% | 3.1% |
| Bloomfield | 1,248 | +1.6% | 2.7% |
| Liverpool | 979 | +2.3% | 2.1% |
| Millerstown | 699 | +2.2% | 1.5% |
| Blain | 225 | +1.8% | 0.5% |
| Landisburg | 224 | +1.8% | 0.5% |
| New Buffalo | 128 | +3.2% | 0.3% |
9 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Perry County, Homes
Homes in Perry County
Perry County is a place of houses on their own lots: 79% of its 20,010 homes are detached single-family houses, against 57% across Pennsylvania. Much of Perry County is recent building: 17% of its homes have gone up since 2000 and the middle year built is 1977, against 1965 for Pennsylvania. Owners live in 81% of the occupied homes (Pennsylvania: 69%), so for most households a test and a fix are their own to order.
| Homes | Perry County | Pennsylvania |
|---|---|---|
| Housing units | 20,010 | 5,779,663 |
| Detached houses | 79% | 57% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 9% | 4% |
| Built before 1960 | 33% | 45% |
| Built since 2000 | 17% | 14% |
| Middle year built | 1977 | 1965 |
| Owner-occupied | 81% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.