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 Sullivan County, Pennsylvania
EPA puts Sullivan County in Zone 1, its highest radon zone, and 29.0% of its 31 reported radon tests (2020) were 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
29.0%
1.3 pts below PA
- Sullivan
- 29.0%
- PA
- 30.3%
31 tests, 2020
Median result
2.0pCi/L
Below action level
- Sullivan
- 2.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
31
63rd of 63 by tests
- Sullivan
- 31
- 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
52 of 63
Lowest quarter
- Sullivan
- 29.0%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Sullivan County
Starts at Sullivan County's median, 2.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.0 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. Sullivan County's median reported result, 2020.
The data
Sullivan County, At a glance
Sullivan County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Sullivan 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 Sullivan County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 32.3% |
| 2015 | 43.5% |
| 2016 | 32.4% |
| 2017 | 54.3% |
| 2018 | 37.5% |
| 2019 | 37.2% |
| 2020 | 29.0% |
2020: 29.0%. Across these years the share ran from 29.0% to 54.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 31 tests reported to CDC for Sullivan 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).
Sullivan County, Compared
Sullivan County radon figures, compared
Calculated by Radon411Sullivan County's 31 reported tests in 2020 had a middle value of 2.0 pCi/L and a maximum of 17.8 pCi/L, and 29.0% reached 4 pCi/L. Pennsylvania as a whole (67 Pennsylvania counties, pooled) comes to 30.3%: 1.3 points higher than here.
Among its state's counties it ranks 52nd of 63 Pennsylvania counties with 30 or more tests for the same period. Statewide for the same period, Perry County reported the highest share (57.7%) and Philadelphia County the lowest (10.6%).
Below the action level, 15 tests (48.4%) came in under 2 pCi/L, against 44.3% statewide, and 7 tests (22.6%) fell between 2 and 4, against 25.4% statewide. The busiest year on file was 2016, with 68 tests reported; the quietest, 2015, had 23.
EPA's 1993 zone map puts Sullivan County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Next door, the shares run from 28.2% in Luzerne County to 45.2% in Lycoming County, with Luzerne County below Sullivan County. Over 5 years of annual figures the share fell 3.3 points, from 32.3% in 2014 to 29.0% in 2020; its peak was 54.3% in 2017.
Sullivan CountyPennsylvania, pooled
| Year | Tests | Sullivan County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 31 | 32.3% | 36.1% |
| 2016 | 68 | 32.4% | 34.4% |
| 2017 | 35 | 54.3% | 35.1% |
| 2019 | 43 | 37.2% | 31.4% |
| 2020 | 31 | 29.0% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sullivan County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Sullivan 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 Sullivan County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 13 ZIP codes that lie wholly or partly in Sullivan County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 17701 | Basement: average 9.8 pCi/L, 5,530 tests; First floor: average 3.6 pCi/L, 1,005 tests |
| 17731 | Basement: average 4.3 pCi/L, 134 tests; First floor: average 2.4 pCi/L, 47 tests |
| 17737 | Basement: average 13.6 pCi/L, 609 tests; First floor: average 4.2 pCi/L, 101 tests |
| 17758 | Basement: average 6.5 pCi/L, 61 tests; First floor: figures not shown |
| 17768 | Basement: figures not shown; First floor: figures not shown |
| 17814 | Basement: average 16.6 pCi/L, 402 tests; First floor: average 5.0 pCi/L, 100 tests |
| 18614 | Basement: average 13.4 pCi/L, 125 tests; First floor: figures not shown |
| 18616 | Basement: average 5.0 pCi/L, 38 tests; First floor: figures not shown |
| 18619 | Basement: figures not shown; First floor: figures not shown |
| 18626 | Basement: average 5.0 pCi/L, 80 tests; First floor: figures not shown |
| 18628 | Basement: figures not shown; First floor: figures not shown |
| 18632 | Basement: figures not shown; First floor: figures not shown |
| 18833 | Basement: average 6.3 pCi/L, 44 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.
Sullivan County, Geology
The ground under Sullivan County
PredictedUSGS's geologic map puts all of Sullivan County's mapped land in one class: high radon potential. The map puts 81.0% of Sullivan County in the area it calls Mountainous High Plateau and 13.5% 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 | 81.0% |
| Glaciated Low Plateau Western Portion | Moderately thick glacial till overlying sandstone, siltstone, mudstone, and shale. | High | 13 | 13.5% |
| Appalachian Mountain Section | Paleozoic sandstone, shale, and limestone. | High | 12 | 5.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sullivan County beside the ground around it
Sullivan 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; Bradford County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Sullivan County, Local resources
Radon testing and mitigation in Sullivan 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
Sullivan County, Questions
Questions about radon in Sullivan County
Are radon levels high in Sullivan County?
In 2020, 29.0% of the radon tests reported to CDC for Sullivan County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 51 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Sullivan County?
Sullivan County borders 5 counties: Bradford County, Wyoming County, Lycoming County, Columbia County and Luzerne County.
Products
Sullivan County, Products
Testing a home in Sullivan County
In Sullivan County, 29.0% of 31 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Sullivan 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
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
Method: Ion chamber
First reading: Within 10 minutes
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
Sullivan County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Sullivan County
Explore
Sullivan County, Bordering counties
Counties bordering Sullivan County
Calculated by Radon411- Radon levels in Lycoming CountyEPA zone 1
45.2%at or above 4 pCi/L
Median 3.5 pCi/L · 562 tests · 16.2 points above Sullivan County
- Radon levels in Bradford CountyEPA zone 1
43.4%at or above 4 pCi/L
Median 3.4 pCi/L · 286 tests · 14.4 points above Sullivan County
- Radon levels in Columbia CountyEPA zone 1
34.7%at or above 4 pCi/L
Median 2.0 pCi/L · 409 tests · 5.7 points above Sullivan County
- Radon levels in Wyoming CountyEPA zone 1
30.9%at or above 4 pCi/L
Median 2.0 pCi/L · 123 tests · 1.9 points above Sullivan County
- Radon levels in Luzerne CountyEPA zone 1
28.2%at or above 4 pCi/L
Median 2.0 pCi/L · 991 tests · 0.8 points below Sullivan County
Sullivan County, Cities and towns
Cities and towns in Sullivan County
The Census Bureau estimates 5,856 residents in Sullivan County for July 1, 2025, 33 more than in 2020 (+0.6%). That works out to 13 people per square mile of land. No town dominates: Dushore, the largest, has 452 residents, 7.7% of the total. Together its 4 incorporated places hold 17.5% of those residents; the other 82.5% live outside any of them. CDC's 31 reported tests for 2020 work out to 5.3 per 1,000 residents (2025 estimate), close to Pennsylvania's 7.2.
From Dushore to Forksville, CDC publishes no figure by town: each reads Sullivan County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Dushore | 452 | −0.7% | 7.7% |
| Laporte | 312 | +0.6% | 5.3% |
| Eagles Mere | 153 | +2.0% | 2.6% |
| Forksville | 108 | −0.9% | 1.8% |
4 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).
Sullivan County, Homes
Homes in Sullivan County
Sullivan County is a place of houses on their own lots: 87% of its 5,601 homes are detached single-family houses, against 57% across Pennsylvania. Half of its homes were built before 1972, close to Pennsylvania's 1965: 40% date from before 1960 and 14% from 2000 or later. Owners live in 83% of the occupied homes (Pennsylvania: 69%), so for most households a test and a fix are their own to order.
| Homes | Sullivan County | Pennsylvania |
|---|---|---|
| Housing units | 5,601 | 5,779,663 |
| Detached houses | 87% | 57% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 9% | 4% |
| Built before 1960 | 40% | 45% |
| Built since 2000 | 14% | 14% |
| Middle year built | 1972 | 1965 |
| Owner-occupied | 83% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.