Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Snyder County, Pennsylvania
EPA puts Snyder County in Zone 1, its highest radon zone, and high results are common there: 42.4% of the 99 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
42.4%
12.1 pts above PA
- Snyder
- 42.4%
- PA
- 30.3%
99 tests, 2020
Median result
2.8pCi/L
Below action level
- Snyder
- 2.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
99
58th of 63 by tests
- Snyder
- 99
- 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
23 of 63
Middle half
- Snyder
- 42.4%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Snyder County
Starts at Snyder County's median, 2.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.8 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Snyder County's median reported result, 2020.
The data
Snyder County, At a glance
Snyder County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Snyder 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 Snyder County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 63.0% |
| 2015 | 64.6% |
| 2016 | 72.4% |
| 2017 | 57.3% |
| 2018 | 59.1% |
| 2019 | 48.4% |
| 2020 | 42.4% |
2020: 42.4%. Across these years the share ran from 42.4% to 72.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 99 tests reported to CDC for Snyder 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).
Snyder County, Compared
Snyder County radon figures, compared
Calculated by Radon411In Snyder County, about 4 in 10 reported tests in 2020 (42 of 99) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 16.9 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Snyder County runs 12.1 points above its state.
Of 4 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 41.4% (Mifflin County) to 52.9% (Juniata County). By share, Snyder County is 23rd of 63 Pennsylvania counties with 30 or more tests for the same period.
Year by year, 2014 opened at 63.0% and 2020 closed at 42.4% (down 20.6 points), with 2016 the high at 72.4%. Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 144.0 pCi/L. Below the action level, 42 tests (42.4%) came in under 2 pCi/L, against 44.3% statewide, and 15 tests (15.2%) fell between 2 and 4, against 25.4% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 42.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2019, with 184 tests reported; the quietest, 2014, had 92.
Snyder CountyPennsylvania, pooled
42.4% % of tests30.3% % of tests
| Year | Tests | Snyder County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 92 | 63.0% | 36.1% |
| 2015 | 113 | 64.6% | 37.8% |
| 2016 | 116 | 72.4% | 34.4% |
| 2017 | 143 | 57.3% | 35.1% |
| 2018 | 132 | 59.1% | 30.5% |
| 2019 | 184 | 48.4% | 31.4% |
| 2020 | 99 | 42.4% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Snyder County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Snyder 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 Snyder County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 15 ZIP codes that lie wholly or partly in Snyder County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 17045 | Basement: average 18.9 pCi/L, 254 tests; First floor: average 15.8 pCi/L, 42 tests |
| 17063 | Basement: average 12.3 pCi/L, 128 tests; First floor: average 6.5 pCi/L, 38 tests |
| 17086 | Basement: average 12.7 pCi/L, 83 tests; First floor: figures not shown |
| 17812 | Basement: average 6.6 pCi/L, 57 tests; First floor: figures not shown |
| 17813 | Basement: average 7.8 pCi/L, 133 tests; First floor: figures not shown |
| 17827 | Basement: average 8.6 pCi/L, 45 tests; First floor: figures not shown |
| 17841 | Basement: average 14.2 pCi/L, 157 tests; First floor: figures not shown |
| 17842 | Basement: average 14.0 pCi/L, 580 tests; First floor: average 7.0 pCi/L, 54 tests |
| 17853 | Basement: average 15.0 pCi/L, 93 tests; First floor: figures not shown |
| 17861 | Basement: figures not shown; First floor: figures not shown |
| 17862 | Basement: figures not shown; First floor: figures not shown |
| 17864 | Basement: average 18.9 pCi/L, 100 tests; First floor: figures not shown |
| 17870 | Basement: average 9.7 pCi/L, 2,373 tests; First floor: average 4.7 pCi/L, 363 tests |
| 17876 | Basement: average 10.9 pCi/L, 283 tests; First floor: figures not shown |
| 17889 | Basement: average 19.8 pCi/L, 581 tests; First floor: average 16.2 pCi/L, 62 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.
Snyder County, Geology
The ground under Snyder County
PredictedUSGS's geologic map puts all of Snyder County's mapped land in one class: high radon potential. All 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Snyder County beside the ground around it
Snyder County has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%. Of the 4 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
Snyder County, Local resources
Radon testing and mitigation in Snyder County
Listed radon businesses with an address in Snyder 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: Selinsgrove, Middleburg
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
Snyder County, Questions
Questions about radon in Snyder County
Are radon levels high in Snyder County?
In 2020, 42.4% of the radon tests reported to CDC for Snyder County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 22 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Snyder County?
Snyder County borders 4 counties: Union County, Northumberland County, Mifflin County and Juniata County.
Products
Snyder County, Products
Testing a home in Snyder County
In Snyder County, 42.4% of 99 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Snyder 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
Monitor
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Snyder County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Snyder County
Explore
Snyder County, Bordering counties
Counties bordering Snyder 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 · 10.5 points above Snyder County
- Radon levels in Northumberland CountyEPA zone 1
49.8%at or above 4 pCi/L
Median 3.9 pCi/L · 275 tests · 7.4 points above Snyder County
- Radon levels in Union CountyEPA zone 1
44.5%at or above 4 pCi/L
Median 3.3 pCi/L · 182 tests · 2.1 points above Snyder County
- Radon levels in Mifflin CountyEPA zone 1
41.4%at or above 4 pCi/L
Median 2.7 pCi/L · 111 tests · 1.0 points below Snyder County
Snyder County, Cities and towns
Cities and towns in Snyder County
Snyder County's population has barely moved since 2020: 39,655 residents on July 1, 2025 against 39,737 then, by the Census Bureau's estimates. That works out to 121 people per square mile of land. No town dominates: Selinsgrove, the largest, has 5,488 residents, 13.8% of the total. Together its 6 incorporated places hold 27.3% of those residents; the other 72.7% live outside any of them. Reported testing is thin here: 99 tests over 2020, or 2.5 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.
From Selinsgrove to Freeburg, CDC publishes no figure by town: each reads Snyder County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Selinsgrove | 5,488 | −4.0% | 13.8% |
| Shamokin Dam | 1,623 | −1.3% | 4.1% |
| Middleburg | 1,302 | −1.5% | 3.3% |
| Beavertown | 984 | −1.2% | 2.5% |
| McClure | 880 | −1.2% | 2.2% |
| Freeburg | 552 | −1.3% | 1.4% |
6 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).
Snyder County, Homes
Homes in Snyder County
Snyder County is a place of houses on their own lots: 75% of its 16,033 homes are detached single-family houses, against 57% across Pennsylvania. Much of Snyder County is recent building: 16% of its homes have gone up since 2000 and the middle year built is 1973, against 1965 for Pennsylvania. 74% of occupied homes are lived in by their owner (Pennsylvania: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Snyder County | Pennsylvania |
|---|---|---|
| Housing units | 16,033 | 5,779,663 |
| Detached houses | 75% | 57% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 8% | 4% |
| Built before 1960 | 36% | 45% |
| Built since 2000 | 16% | 14% |
| Middle year built | 1973 | 1965 |
| Owner-occupied | 74% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.