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 Montour County, Pennsylvania
EPA puts Montour County in Zone 1, its highest radon zone, and high results are common there: 41.5% of the 123 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
41.5%
11.2 pts above PA
- Montour
- 41.5%
- PA
- 30.3%
123 tests, 2020
Median result
3.1pCi/L
Below action level
- Montour
- 3.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
123
51st of 63 by tests
- Montour
- 123
- 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
27 of 63
Middle half
- Montour
- 41.5%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Montour County
Starts at Montour County's median, 3.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.1 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. Montour County's median reported result, 2020.
The data
Montour County, At a glance
Montour County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Montour 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 Montour County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 45.5% |
| 2015 | 45.7% |
| 2016 | 34.8% |
| 2017 | 39.6% |
| 2018 | 40.3% |
| 2019 | 40.9% |
| 2020 | 41.5% |
2020: 41.5%. Across these years the share ran from 34.8% to 45.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 123 tests reported to CDC for Montour 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).
Montour County, Compared
Montour County radon figures, compared
Calculated by Radon411In Montour County, about 4 in 10 reported tests in 2020 (51 of 123) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 16.0 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Montour County runs 11.2 points above its state.
Of 3 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 34.7% (Columbia County) to 49.8% (Northumberland County). By share, Montour County is 27th of 63 Pennsylvania counties with 30 or more tests for the same period.
Year by year, 2014 opened at 45.5% and 2020 closed at 41.5% (down 4.0 points), with 2015 the high at 45.7%. Half the tests came in under 3.1 pCi/L and half over it; the single highest reached 151.0 pCi/L. Below the action level, 47 tests (38.2%) came in under 2 pCi/L, against 44.3% statewide, and 25 tests (20.3%) fell between 2 and 4, against 25.4% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 41.5% 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 164 tests reported; the quietest, 2014, had 110.
Montour CountyPennsylvania, pooled
41.5% % of tests30.3% % of tests
| Year | Tests | Montour County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 110 | 45.5% | 36.1% |
| 2015 | 116 | 45.7% | 37.8% |
| 2016 | 141 | 34.8% | 34.4% |
| 2017 | 144 | 39.6% | 35.1% |
| 2018 | 149 | 40.3% | 30.5% |
| 2019 | 164 | 40.9% | 31.4% |
| 2020 | 123 | 41.5% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Montour County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Montour 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 Montour County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 10 ZIP codes that lie wholly or partly in Montour County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 17756 | Basement: average 12.2 pCi/L, 1,154 tests; First floor: average 3.6 pCi/L, 250 tests |
| 17772 | Basement: average 6.1 pCi/L, 233 tests; First floor: average 3.0 pCi/L, 30 tests |
| 17777 | Basement: average 8.4 pCi/L, 712 tests; First floor: average 2.9 pCi/L, 104 tests |
| 17815 | Basement: average 11.6 pCi/L, 4,604 tests; First floor: average 5.3 pCi/L, 707 tests |
| 17820 | Basement: average 20.6 pCi/L, 664 tests; First floor: average 6.3 pCi/L, 141 tests |
| 17821 | Basement: average 9.7 pCi/L, 3,919 tests; First floor: average 5.5 pCi/L, 633 tests |
| 17822 | Basement: figures not shown; First floor: figures not shown |
| 17824 | Basement: average 11.9 pCi/L, 795 tests; First floor: average 7.0 pCi/L, 96 tests |
| 17847 | Basement: average 8.3 pCi/L, 1,494 tests; First floor: average 3.2 pCi/L, 235 tests |
| 17884 | Basement: figures not shown; 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.
Montour County, Geology
The ground under Montour County
PredictedUSGS's geologic map puts all of Montour 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.
Montour County beside the ground around it
Montour County has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%. Of the 3 counties that border it, none has as large a share of high-potential ground; Northumberland County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Montour County, Local resources
Radon testing and mitigation in Montour 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
Montour County, Questions
Questions about radon in Montour County
Are radon levels high in Montour County?
In 2020, 41.5% of the radon tests reported to CDC for Montour County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.1 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 26 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Montour County?
Montour County borders 3 counties: Northumberland County, Columbia County and Lycoming County.
Products
Montour County, Products
Testing a home in Montour County
In Montour County, 41.5% of 123 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Montour 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
RadonEye RD200 plug-in continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Montour County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Montour County
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Montour County, Bordering counties
Counties bordering Montour County
Calculated by Radon411- Radon levels in Northumberland CountyEPA zone 1
49.8%at or above 4 pCi/L
Median 3.9 pCi/L · 275 tests · 8.3 points above Montour County
- Radon levels in Lycoming CountyEPA zone 1
45.2%at or above 4 pCi/L
Median 3.5 pCi/L · 562 tests · 3.7 points above Montour County
- Radon levels in Columbia CountyEPA zone 1
34.7%at or above 4 pCi/L
Median 2.0 pCi/L · 409 tests · 6.8 points below Montour County
Montour County, Cities and towns
Cities and towns in Montour County
About 17,868 people live in Montour County by the Census Bureau's estimate for July 1, 2025, 262 fewer than in 2020 (−1.4%). That works out to 137 people per square mile of land. Its largest town, Danville, has 4,101 residents, 23.0% of the total. Together its 2 incorporated places hold 24.1% of those residents; the other 75.9% live outside any of them. CDC's 123 reported tests for 2020 work out to 6.9 per 1,000 residents (2025 estimate), close to Pennsylvania's 7.2.
From Danville to Washingtonville, CDC publishes no figure by town: each reads Montour County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Danville | 4,101 | −2.9% | 23.0% |
| Washingtonville | 206 | +2.0% | 1.2% |
2 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).
Montour County, Homes
Homes in Montour County
Of Montour County's 8,117 homes, 66% are detached houses, against 57% across Pennsylvania; 10% are in buildings of five or more homes. Much of Montour County is recent building: 14% of its homes have gone up since 2000 and the middle year built is 1975, against 1965 for Pennsylvania. 67% 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 | Montour County | Pennsylvania |
|---|---|---|
| Housing units | 8,117 | 5,779,663 |
| Detached houses | 66% | 57% |
| In buildings of 5 or more | 10% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 32% | 45% |
| Built since 2000 | 14% | 14% |
| Middle year built | 1975 | 1965 |
| Owner-occupied | 67% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.