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 Mifflin County, Pennsylvania
EPA puts Mifflin County in Zone 1, its highest radon zone, and high results are common there: 41.4% of the 111 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
41.4%
11.1 pts above PA
- Mifflin
- 41.4%
- PA
- 30.3%
111 tests, 2020
Median result
2.7pCi/L
Below action level
- Mifflin
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
111
55th of 63 by tests
- Mifflin
- 111
- 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
28 of 63
Middle half
- Mifflin
- 41.4%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Mifflin County
Starts at Mifflin County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Mifflin County's median reported result, 2020.
The data
Mifflin County, At a glance
Mifflin County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Mifflin 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 Mifflin County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 57.0% |
| 2015 | 70.2% |
| 2016 | 51.5% |
| 2017 | 70.3% |
| 2018 | 54.8% |
| 2019 | 59.3% |
| 2020 | 41.4% |
2020: 41.4%. Across these years the share ran from 41.4% to 70.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 111 tests reported to CDC for Mifflin 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).
Mifflin County, Compared
Mifflin County radon figures, compared
Calculated by Radon411In Mifflin County, about 4 in 10 reported tests in 2020 (46 of 111) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 15.9 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Mifflin County runs 11.1 points above its state.
Of 5 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 39.3% (Centre County) to 54.0% (Huntingdon County). By share, Mifflin County is 28th of 63 Pennsylvania counties with 30 or more tests for the same period.
Year by year, 2014 opened at 57.0% and 2020 closed at 41.4% (down 15.6 points), with 2017 the high at 70.3%. Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 135.0 pCi/L. Below the action level, 42 tests (37.8%) came in under 2 pCi/L, against 44.3% statewide, and 23 tests (20.7%) fell between 2 and 4, against 25.4% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 41.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2015, with 171 tests reported; the quietest, 2014, had 93.
Mifflin CountyPennsylvania, pooled
41.4% % of tests30.3% % of tests
| Year | Tests | Mifflin County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 93 | 57.0% | 36.1% |
| 2015 | 171 | 70.2% | 37.8% |
| 2016 | 169 | 51.5% | 34.4% |
| 2017 | 138 | 70.3% | 35.1% |
| 2018 | 168 | 54.8% | 30.5% |
| 2019 | 167 | 59.3% | 31.4% |
| 2020 | 111 | 41.4% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Mifflin County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Mifflin 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 Mifflin County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 14 ZIP codes that lie wholly or partly in Mifflin County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 17002 | Basement: figures not shown; First floor: figures not shown |
| 17004 | Basement: average 20.8 pCi/L, 265 tests; First floor: average 7.6 pCi/L, 353 tests |
| 17009 | Basement: average 10.3 pCi/L, 81 tests; First floor: figures not shown |
| 17029 | Basement: figures not shown; First floor: figures not shown |
| 17044 | Basement: average 10.5 pCi/L, 1,497 tests; First floor: average 5.1 pCi/L, 161 tests |
| 17051 | Basement: average 10.8 pCi/L, 175 tests; First floor: figures not shown |
| 17054 | Basement: figures not shown |
| 17060 | Basement: average 6.0 pCi/L, 37 tests; First floor: figures not shown |
| 17063 | Basement: average 12.3 pCi/L, 128 tests; First floor: average 6.5 pCi/L, 38 tests |
| 17066 | Basement: average 8.3 pCi/L, 98 tests; First floor: figures not shown |
| 17075 | Basement: figures not shown; First floor: figures not shown |
| 17084 | Basement: average 18.5 pCi/L, 666 tests; First floor: average 14.5 pCi/L, 72 tests |
| 17099 | Basement: average 8.0 pCi/L, 53 tests; First floor: figures not shown |
| 17841 | Basement: average 14.2 pCi/L, 157 tests; First floor: figures not shown |
- 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.
Mifflin County, Geology
The ground under Mifflin County
PredictedUSGS's geologic map puts all of Mifflin 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.
Mifflin County beside the ground around it
Mifflin 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; Huntingdon County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Mifflin County, Local resources
Radon testing and mitigation in Mifflin 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.
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
Mifflin County, Questions
Questions about radon in Mifflin County
Are radon levels high in Mifflin County?
In 2020, 41.4% of the radon tests reported to CDC for Mifflin County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 27 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Mifflin County?
Mifflin County borders 5 counties: Juniata County, Huntingdon County, Centre County, Snyder County and Union County.
Products
Mifflin County, Products
Testing a home in Mifflin County
In Mifflin County, 41.4% of 111 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Mifflin 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
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Mifflin County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Mifflin County
Explore
Mifflin County, Bordering counties
Counties bordering Mifflin County
Calculated by Radon411- Radon levels in Huntingdon CountyEPA zone 1
54.0%at or above 4 pCi/L
Median 4.5 pCi/L · 100 tests · 12.6 points above Mifflin County
- Radon levels in Juniata CountyEPA zone 1
52.9%at or above 4 pCi/L
Median 4.4 pCi/L · 87 tests · 11.5 points above Mifflin County
- Radon levels in Union CountyEPA zone 1
44.5%at or above 4 pCi/L
Median 3.3 pCi/L · 182 tests · 3.1 points above Mifflin County
- Radon levels in Snyder CountyEPA zone 1
42.4%at or above 4 pCi/L
Median 2.8 pCi/L · 99 tests · 1.0 points above Mifflin County
- Radon levels in Centre CountyEPA zone 1
39.3%at or above 4 pCi/L
Median 2.3 pCi/L · 670 tests · 2.1 points below Mifflin County
Mifflin County, Cities and towns
Cities and towns in Mifflin County
Mifflin County's population has barely moved since 2020: 46,127 residents on July 1, 2025 against 46,144 then, by the Census Bureau's estimates. That works out to 112 people per square mile of land. No town dominates: Lewistown, the largest, has 8,385 residents, 18.2% of the total. Together its 6 incorporated places hold 25.4% of those residents; the other 74.6% live outside any of them. Reported testing is thin here: 111 tests over 2020, or 2.4 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.
From Lewistown to Newton Hamilton, CDC publishes no figure by town: each reads Mifflin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lewistown | 8,385 | −2.0% | 18.2% |
| Burnham | 1,970 | −1.1% | 4.3% |
| Juniata Terrace | 550 | −2.1% | 1.2% |
| McVeytown | 334 | −1.8% | 0.7% |
| Kistler | 291 | −1.7% | 0.6% |
| Newton Hamilton | 203 | +4.6% | 0.4% |
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).
Mifflin County, Homes
Homes in Mifflin County
Of Mifflin County's 21,425 homes, 70% are detached houses, against 57% across Pennsylvania; 8% are mobile homes. Half of its homes were built before 1960, close to Pennsylvania's 1965: 50% date from before 1960 and 10% from 2000 or later. 71% 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 | Mifflin County | Pennsylvania |
|---|---|---|
| Housing units | 21,425 | 5,779,663 |
| Detached houses | 70% | 57% |
| In buildings of 5 or more | 6% | 13% |
| Mobile homes | 8% | 4% |
| Built before 1960 | 50% | 45% |
| Built since 2000 | 10% | 14% |
| Middle year built | 1960 | 1965 |
| Owner-occupied | 71% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.