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 Lycoming County, Pennsylvania
EPA puts Lycoming County in Zone 1, its highest radon zone, and high results are common there: 45.2% of the 562 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
45.2%
14.9 pts above PA
- Lycoming
- 45.2%
- PA
- 30.3%
562 tests, 2020
Median result
3.5pCi/L
Below action level
- Lycoming
- 3.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2020
Tests reported
562
29th of 63 by tests
- Lycoming
- 562
- 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
13 of 63
Top quarter
- Lycoming
- 45.2%
- Perry
- 57.7%
By share, of 63 with 30+ tests
Read a result for Lycoming County
Starts at Lycoming County's median, 3.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.5 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. Lycoming County's median reported result, 2020.
The data
Lycoming County, At a glance
Lycoming County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Lycoming 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 Lycoming County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 49.0% |
| 2015 | 59.4% |
| 2016 | 49.4% |
| 2017 | 44.3% |
| 2018 | 42.9% |
| 2019 | 44.7% |
| 2020 | 45.2% |
2020: 45.2%. Across these years the share ran from 42.9% to 59.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 562 tests reported to CDC for Lycoming 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).
Lycoming County, Compared
Lycoming County radon figures, compared
Calculated by Radon411In Lycoming County, about 5 in 10 reported tests in 2020 (254 of 562) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 19.7 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Lycoming County runs 14.9 points above its state.
Of 9 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 7 a smaller one; the spread is 17.9% (Potter County) to 54.1% (Clinton County). By share, Lycoming County is 13th of 63 Pennsylvania counties with 30 or more tests for the same period.
Year by year, 2014 opened at 49.0% and 2020 closed at 45.2% (down 3.8 points), with 2015 the high at 59.4%. Half the tests came in under 3.5 pCi/L and half over it; the single highest reached 236.3 pCi/L. Below the action level, 159 tests (28.3%) came in under 2 pCi/L, against 44.3% statewide, and 149 tests (26.5%) fell between 2 and 4, against 25.4% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 45.2% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2016, with 617 tests reported; the quietest, 2014, had 390.
Lycoming CountyPennsylvania, pooled
45.2% % of tests30.3% % of tests
| Year | Tests | Lycoming County, at or above 4 pCi/L | Pennsylvania, pooled |
|---|---|---|---|
| 2014 | 390 | 49.0% | 36.1% |
| 2015 | 512 | 59.4% | 37.8% |
| 2016 | 617 | 49.4% | 34.4% |
| 2017 | 501 | 44.3% | 35.1% |
| 2018 | 560 | 42.9% | 30.5% |
| 2019 | 553 | 44.7% | 31.4% |
| 2020 | 562 | 45.2% | 30.3% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lycoming County, State data
Pennsylvania's own radon test data
MeasuredWhat Pennsylvania's own agencies publish about radon tests in Lycoming 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 Lycoming County
Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 29 ZIP codes that lie wholly or partly in Lycoming County, each with the state's own figures for it. Period: Period not stated by DEP.
| ZIP code | What the state reports |
|---|---|
| 16930 | Basement: average 8.3 pCi/L, 79 tests; First floor: figures not shown |
| 16938 | Basement: average 7.5 pCi/L, 58 tests; First floor: figures not shown |
| 17701 | Basement: average 9.8 pCi/L, 5,530 tests; First floor: average 3.6 pCi/L, 1,005 tests |
| 17702 | Basement: average 6.7 pCi/L, 705 tests; First floor: average 4.6 pCi/L, 99 tests |
| 17720 | Basement: figures not shown |
| 17723 | Basement: figures not shown; First floor: figures not shown |
| 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 |
| 17728 | Basement: average 19.1 pCi/L, 760 tests; First floor: average 13.2 pCi/L, 70 tests |
| 17737 | Basement: average 13.6 pCi/L, 609 tests; First floor: average 4.2 pCi/L, 101 tests |
| 17740 | Basement: average 12.0 pCi/L, 976 tests; First floor: average 3.4 pCi/L, 198 tests |
| 17742 | Basement: figures not shown; First floor: figures not shown |
| 17744 | Basement: average 21.8 pCi/L, 242 tests; First floor: average 5.6 pCi/L, 49 tests |
| 17745 | Basement: average 9.3 pCi/L, 2,405 tests; First floor: average 3.8 pCi/L, 356 tests |
| 17752 | Basement: average 7.3 pCi/L, 351 tests; First floor: average 1.8 pCi/L, 50 tests |
| 17754 | Basement: average 10.8 pCi/L, 2,568 tests; First floor: average 6.4 pCi/L, 242 tests |
| 17756 | Basement: average 12.2 pCi/L, 1,154 tests; First floor: average 3.6 pCi/L, 250 tests |
| 17758 | Basement: average 6.5 pCi/L, 61 tests; First floor: figures not shown |
| 17762 | Basement: figures not shown; First floor: figures not shown |
| 17763 | Basement: figures not shown; First floor: figures not shown |
| 17765 | Basement: average 4.4 pCi/L, 35 tests; First floor: figures not shown |
| 17769 | Basement: figures not shown; First floor: figures not shown |
| 17771 | Basement: average 19.9 pCi/L, 222 tests; First floor: average 5.7 pCi/L, 50 tests |
| 17774 | Basement: average 11.4 pCi/L, 58 tests; First floor: figures not shown |
| 17776 | Basement: figures not shown; First floor: figures not shown |
| 17810 | Basement: average 6.2 pCi/L, 112 tests; First floor: figures not shown |
| 17814 | Basement: average 16.6 pCi/L, 402 tests; First floor: average 5.0 pCi/L, 100 tests |
| 17846 | Basement: average 15.5 pCi/L, 345 tests; First floor: average 3.2 pCi/L, 78 tests |
| 18619 | 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.
Lycoming County, Geology
The ground under Lycoming County
PredictedUSGS's geologic map puts all of Lycoming County's mapped land in one class: high radon potential. The map puts 52.5% of Lycoming County in the area it calls Mountainous High Plateau and 46.8% in Appalachian Mountain Section, with one smaller area beside them. USGS gives both 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 |
|---|---|---|---|---|
| Mountainous High Plateau | Sandstone, shale and conglomerate. | High | 12 | 52.5% |
| Appalachian Mountain Section | Paleozoic sandstone, shale, and limestone. | High | 12 | 46.8% |
| Glaciated Low Plateau Western Portion | Moderately thick glacial till overlying sandstone, siltstone, mudstone, and shale. | High | 13 | 0.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lycoming County beside the ground around it
Lycoming County has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%. Of the 9 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
Lycoming County, Local resources
Radon testing and mitigation in Lycoming County
Listed radon businesses with an address in Lycoming 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: Williamsport
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
Lycoming County, Questions
Questions about radon in Lycoming County
Are radon levels high in Lycoming County?
In 2020, 45.2% of the radon tests reported to CDC for Lycoming County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 12 reported a higher share; pooled, the state comes to 30.3%.
Which counties border Lycoming County?
Lycoming County borders 9 counties: Union County, Tioga County, Montour County, Sullivan County, Clinton County, Northumberland County, Columbia County, Bradford County and Potter County.
Products
Lycoming County, Products
Testing a home in Lycoming County
In Lycoming County, 45.2% of 562 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Lycoming 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-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
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
Lycoming County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Lycoming County
Explore
Lycoming County, Bordering counties
Counties bordering Lycoming County
Calculated by Radon411- Radon levels in Clinton CountyEPA zone 1
54.1%at or above 4 pCi/L
Median 4.5 pCi/L · 133 tests · 8.9 points above Lycoming County
- Radon levels in Northumberland CountyEPA zone 1
49.8%at or above 4 pCi/L
Median 3.9 pCi/L · 275 tests · 4.6 points above Lycoming County
- Radon levels in Tioga CountyEPA zone 1
45.0%at or above 4 pCi/L
Median 3.2 pCi/L · 160 tests · 0.2 points below Lycoming County
- Radon levels in Union CountyEPA zone 1
44.5%at or above 4 pCi/L
Median 3.3 pCi/L · 182 tests · 0.7 points below Lycoming County
- Radon levels in Bradford CountyEPA zone 1
43.4%at or above 4 pCi/L
Median 3.4 pCi/L · 286 tests · 1.8 points below Lycoming County
- Radon levels in Montour CountyEPA zone 1
41.5%at or above 4 pCi/L
Median 3.1 pCi/L · 123 tests · 3.7 points below Lycoming County
- Radon levels in Columbia CountyEPA zone 1
34.7%at or above 4 pCi/L
Median 2.0 pCi/L · 409 tests · 10.5 points below Lycoming County
- Radon levels in Sullivan CountyEPA zone 1
29.0%at or above 4 pCi/L
Median 2.0 pCi/L · 31 tests · 16.2 points below Lycoming County
- Radon levels in Potter CountyEPA zone 2
17.9%at or above 4 pCi/L
Median 1.1 pCi/L · 195 tests · 27.3 points below Lycoming County
Lycoming County, Cities and towns
Cities and towns in Lycoming County
About 112,587 people live in Lycoming County by the Census Bureau's estimate for July 1, 2025, 1,533 fewer than in 2020 (−1.3%). That works out to 92 people per square mile of land. Its largest town, Williamsport, has 27,384 residents, 24.3% of the total. Together its 10 incorporated places hold 44.6% of those residents; the other 55.4% live outside any of them. CDC's 562 reported tests for 2020 work out to 5.0 per 1,000 residents (2025 estimate), close to Pennsylvania's 7.2.
From Williamsport to Salladasburg, CDC publishes no figure by town: each reads Lycoming County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Williamsport | 27,384 | −1.2% | 24.3% |
| South Williamsport | 6,124 | −2.0% | 5.4% |
| Montoursville | 4,635 | −2.3% | 4.1% |
| Jersey Shore | 4,048 | −2.2% | 3.6% |
| Muncy | 2,383 | −2.3% | 2.1% |
| Hughesville | 2,089 | −2.4% | 1.9% |
| Montgomery | 1,538 | −2.3% | 1.4% |
| Duboistown | 1,184 | −1.0% | 1.1% |
| Picture Rocks | 635 | −2.3% | 0.6% |
| Salladasburg | 243 | −2.0% | 0.2% |
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).
Lycoming County, Homes
Homes in Lycoming County
Of Lycoming County's 52,692 homes, 69% are detached houses, against 57% across Pennsylvania; 10% are in buildings of five or more homes. Half of its homes were built before 1963, close to Pennsylvania's 1965: 48% date from before 1960 and 11% from 2000 or later. 69% 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 | Lycoming County | Pennsylvania |
|---|---|---|
| Housing units | 52,692 | 5,779,663 |
| Detached houses | 69% | 57% |
| In buildings of 5 or more | 10% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 48% | 45% |
| Built since 2000 | 11% | 14% |
| Middle year built | 1963 | 1965 |
| Owner-occupied | 69% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.