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 Tioga County, Pennsylvania
EPA puts Tioga County in Zone 1, its highest radon zone, and high results are common there: 45.0% of the 160 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
45.0%
14.7 pts above PA
- Tioga
- 45.0%
- PA
- 30.3%
160 tests, 2020
Median result
3.2pCi/L
Below action level
- Tioga
- 3.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
160
48th of 63 by tests
- Tioga
- 160
- 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
14 of 63
Top quarter
- Tioga
- 45.0%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Tioga County
Starts at Tioga County's median, 3.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.2 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. Tioga County's median reported result, 2020.
The data
Tioga County, At a glance
Tioga County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Tioga County in
USGS geologic potential: High across 95% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Tioga County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 35.7% |
| 2015 | 46.2% |
| 2016 | 30.3% |
| 2017 | 34.5% |
| 2018 | 32.4% |
| 2019 | 36.5% |
| 2020 | 45.0% |
2020: 45.0%. Across these years the share ran from 30.3% to 46.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 160 tests reported to CDC for Tioga 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).
Tioga County, Compared
Tioga County radon figures, compared
Calculated by Radon411In Tioga County, about 5 in 10 reported tests in 2020 (72 of 160) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 19.5 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Tioga County runs 14.7 points above its state.
Of 4 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 17.9% (Potter County) to 55.2% (Steuben County, NY). By share, Tioga County is 14th of 63 Pennsylvania counties with 30 or more tests for the same period.
Year by year, 2014 opened at 35.7% and 2020 closed at 45.0% (up 9.3 points), with 2015 the high at 46.2%. Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 52.2 pCi/L. Below the action level, 56 tests (35.0%) came in under 2 pCi/L, against 44.3% statewide, and 32 tests (20.0%) fell between 2 and 4, against 25.4% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 45.0% share point the same way here. USGS geology rates 95% of the county's land high radon potential.
The busiest year on file was 2019, with 244 tests reported; the quietest, 2014, had 112.
Tioga CountyPennsylvania, pooled
45.0% % of tests30.3% % of tests
| Year | Tests | Tioga County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 112 | 35.7% | 36.1% |
| 2015 | 186 | 46.2% | 37.8% |
| 2016 | 208 | 30.3% | 34.4% |
| 2017 | 206 | 34.5% | 35.1% |
| 2018 | 216 | 32.4% | 30.5% |
| 2019 | 244 | 36.5% | 31.4% |
| 2020 | 160 | 45.0% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Tioga County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Tioga 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 Tioga County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 25 ZIP codes that lie wholly or partly in Tioga County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 16901 | Basement: average 5.7 pCi/L, 1,372 tests; First floor: average 1.9 pCi/L, 263 tests |
| 16911 | Basement: figures not shown; First floor: figures not shown |
| 16912 | Basement: average 3.9 pCi/L, 104 tests; First floor: average 1.8 pCi/L, 53 tests |
| 16914 | Basement: average 6.6 pCi/L, 43 tests; First floor: figures not shown |
| 16917 | Basement: average 5.9 pCi/L, 65 tests; First floor: figures not shown |
| 16920 | Basement: average 11.2 pCi/L, 121 tests; First floor: figures not shown |
| 16921 | Basement: average 7.5 pCi/L, 31 tests; First floor: figures not shown |
| 16928 | Basement: average 6.4 pCi/L, 40 tests; First floor: figures not shown |
| 16929 | Basement: average 8.1 pCi/L, 127 tests; First floor: average 5.6 pCi/L, 34 tests |
| 16930 | Basement: average 8.3 pCi/L, 79 tests; First floor: figures not shown |
| 16932 | Basement: figures not shown; First floor: figures not shown |
| 16933 | Basement: average 5.3 pCi/L, 434 tests; First floor: average 1.9 pCi/L, 127 tests |
| 16935 | Basement: average 10.7 pCi/L, 94 tests; First floor: average 3.3 pCi/L, 43 tests |
| 16936 | Basement: average 9.4 pCi/L, 75 tests; First floor: figures not shown |
| 16938 | Basement: average 7.5 pCi/L, 58 tests; First floor: figures not shown |
| 16939 | First floor: figures not shown |
| 16940 | Basement: figures not shown; First floor: figures not shown |
| 16942 | Basement: average 8.2 pCi/L, 39 tests; First floor: figures not shown |
| 16943 | Basement: figures not shown; First floor: figures not shown |
| 16946 | Basement: average 7.8 pCi/L, 113 tests; First floor: average 2.6 pCi/L, 37 tests |
| 16947 | Basement: average 4.6 pCi/L, 196 tests; First floor: average 2.2 pCi/L, 68 tests |
| 16950 | Basement: average 6.1 pCi/L, 91 tests; First floor: average 3.1 pCi/L, 45 tests |
| 17724 | Basement: average 7.8 pCi/L, 132 tests; First floor: average 3.4 pCi/L, 60 tests |
| 17727 | Basement: figures not shown; First floor: figures not shown |
| 17765 | Basement: average 4.4 pCi/L, 35 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.
Tioga County, Geology
The ground under Tioga County
PredictedMost of the ground under Tioga County is one class on USGS's geologic map: 95.5% of its land is high radon potential, with 4.5% moderate. The map puts 49.2% of Tioga County in the area it calls Mountainous High Plateau and 46.3% in Glaciated Low Plateau Western Portion, with one smaller area beside them. USGS gives the first a radon index of 12 and the second 13, both in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Mountainous High Plateau | Sandstone, shale and conglomerate. | High | 12 | 49.2% |
| Glaciated Low Plateau Western Portion | Moderately thick glacial till overlying sandstone, siltstone, mudstone, and shale. | High | 13 | 46.3% |
| High Plateau | Marine and continental Devonian-Pennsylvanian shale, sandstone, limestone, siltstone, and coal. | Moderate | 10 | 4.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Tioga County beside the ground around it
Tioga County has more high-potential ground than Pennsylvania as a whole: 95.5% of its land against 70.4%. Of the 5 counties that border it, 4 have more high-potential ground, Bradford County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Tioga County, Local resources
Radon testing and mitigation in Tioga 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
Tioga County, Questions
Questions about radon in Tioga County
Are radon levels high in Tioga County?
In 2020, 45.0% of the radon tests reported to CDC for Tioga County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.2 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Tioga County?
Tioga County borders 5 counties: Lycoming County, PA, Potter County, PA, Chemung County, NY, Bradford County, PA and Steuben County, NY.
Products
Tioga County, Products
Testing a home in Tioga County
In Tioga County, 45.0% of 160 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Tioga 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-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
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
Tioga County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Tioga County
Explore
Tioga County, Bordering counties
Counties bordering Tioga County
Calculated by Radon411- Radon levels in Steuben County, NYEPA zone 1
55.2%at or above 4 pCi/L
Median 4.6 pCi/L · 67 tests · 10.2 points above Tioga County
- Radon levels in Lycoming County, PAEPA zone 1
45.2%at or above 4 pCi/L
Median 3.5 pCi/L · 562 tests · 0.2 points above Tioga County
- Radon levels in Bradford County, PAEPA zone 1
43.4%at or above 4 pCi/L
Median 3.4 pCi/L · 286 tests · 1.6 points below Tioga County
- Radon levels in Potter County, PAEPA zone 2
17.9%at or above 4 pCi/L
Median 1.1 pCi/L · 195 tests · 27.1 points below Tioga County
- Radon levels in Chemung County, NYEPA zone 1
0.0%at or above 4 pCi/L
Median 2.6 pCi/L · 5 tests · 45.0 points below Tioga County
Tioga County, Cities and towns
Cities and towns in Tioga County
About 40,502 people live in Tioga County by the Census Bureau's estimate for July 1, 2025, 523 fewer than in 2020 (−1.3%). That works out to 36 people per square mile of land. No town dominates: Wellsboro, the largest, has 3,393 residents, 8.4% of the total. Together its 10 incorporated places hold 32.2% of those residents; the other 67.8% live outside any of them. Reported testing is thin here: 160 tests over 2020, or 4.0 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.
From Wellsboro to Roseville, CDC publishes no figure by town: each reads Tioga County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Wellsboro | 3,393 | −2.3% | 8.4% |
| Mansfield | 2,937 | +3.2% | 7.3% |
| Elkland | 1,772 | −2.9% | 4.4% |
| Blossburg | 1,496 | −2.5% | 3.7% |
| Westfield | 1,075 | −2.9% | 2.7% |
| Lawrenceville | 702 | +1.4% | 1.7% |
| Knoxville | 666 | −2.2% | 1.6% |
| Tioga | 602 | −2.0% | 1.5% |
| Liberty | 232 | −1.7% | 0.6% |
| Roseville | 174 | −1.7% | 0.4% |
10 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).
Tioga County, Homes
Homes in Tioga County
Of Tioga County's 21,542 homes, 72% are detached houses, against 57% across Pennsylvania; 16% are mobile homes. Half of its homes were built before 1971, close to Pennsylvania's 1965: 42% date from before 1960 and 15% from 2000 or later. Owners live in 77% of the occupied homes (Pennsylvania: 69%), so for most households a test and a fix are their own to order.
| Homes | Tioga County | Pennsylvania |
|---|---|---|
| Housing units | 21,542 | 5,779,663 |
| Detached houses | 72% | 57% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 16% | 4% |
| Built before 1960 | 42% | 45% |
| Built since 2000 | 15% | 14% |
| Middle year built | 1971 | 1965 |
| Owner-occupied | 77% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.