Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Ketchikan Gateway Borough, Alaska
EPA puts Ketchikan Gateway Borough in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2021). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
3.1%
Anchorage Municipality, 761 miles
- Anchorage Municipality
- 3.1%
- Alaska
- 11.5%
Share at 4+ pCi/L, 130 tests, 2022
Ground above low
93.2%
14.0 pts above Alaska
- Ketchikan Gateway Borough
- 93.2%
- Alaska
- 79.2%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Ketchikan Gateway Borough
- 2
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Ketchikan Gateway Borough
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Ketchikan Gateway Borough, At a glance
Ketchikan Gateway Borough at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Ketchikan Gateway Borough is a
USGS geologic potential: Moderate across 93% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Ketchikan Gateway Borough, 2021
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 0.0% |
| 2021 | 0.0% |
2021: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Ketchikan Gateway Borough over 2021, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the borough or census area nor this house.
Measured: CDC tracking data. Figure above: 2021. Measured data period: 2005 to 2021 (every CDC figure on file).
Ketchikan Gateway Borough, Compared
Ketchikan Gateway Borough radon figures, compared
Calculated by Radon411CDC's largest figure for Ketchikan Gateway Borough rests on 2 tests over the 2007 to 2016 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 1.9 pCi/L, with a middle value of 1.6 pCi/L.
The nearest counties with a figure are Anchorage Municipality (761 miles away) at 3.1%, Matanuska-Susitna Borough (809 miles away) at 14.3% and Fairbanks North Star Borough (831 miles away) at 19.4%. Pooled across 19 Alaska counties, 11.5% of reported tests reached that level; across every county in the country with a figure, 23.9%.
Statewide for the same period, Fairbanks North Star Borough reported the highest share (19.4%) and Anchorage Municipality the lowest (3.1%). EPA's 1993 map puts Ketchikan Gateway Borough in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 93% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ketchikan Gateway Borough, Geology
The ground under Ketchikan Gateway Borough
PredictedUSGS's geologic map puts all of Ketchikan Gateway Borough's mapped land in one class: moderate radon potential. 93.2% of it lies in the area the map calls Coast Mountains, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coast Mountains | Ultramafic through felsic intrusives, Mesozoic mafic volcanic rocks, Mesozoic and Paleozoic sedimentary rocks, schist, gneiss, marble, amphibolite, pelite. | Moderate | 9 | 93.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ketchikan Gateway Borough beside the ground around it
Ketchikan Gateway Borough has more moderate-potential ground than Alaska as a whole: 93.2% of its land against 79.2%. Of the 2 boroughs and census areas that border it, none has as large a share of moderate-potential ground; Wrangell City and Borough comes nearest at 93.1%.
The map rates the ground, not the air in any home.
Local help
Ketchikan Gateway Borough, Local resources
Radon testing and mitigation in Ketchikan Gateway Borough
- Alaska's radon programAlaska Division of Geological & Geophysical SurveysAlaska's radon program answers questions about testing, mitigation and the rules in Alaska.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Alaska directoryNo professionals are listed in Alaska yet. The state program can point you to registered testers and mitigators.
What Alaska's program says
- Phone
- 907-269-6401
- paul.goodfellow@alaska.gov
What it means
Ketchikan Gateway Borough, Questions
Questions about radon in Ketchikan Gateway Borough
Are radon levels high in Ketchikan Gateway Borough?
In 2021, 0.0% of the radon tests reported to CDC for Ketchikan Gateway Borough, Alaska were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Of the 3 nearest counties with a figure, within 831 miles, the share of tests at or above 4 pCi/L runs from 3.1% to 19.4%.
Which counties border Ketchikan Gateway Borough?
Ketchikan Gateway Borough borders 2 boroughs and census areas: Wrangell City and Borough and Prince of Wales-Hyder Census Area.
Products
Ketchikan Gateway Borough, Products
Testing a home in Ketchikan Gateway Borough
No CDC figure names Ketchikan Gateway Borough; the nearest county with one, Anchorage Municipality (761 miles away), reported 3.1% of its tests at or above 4 pCi/L in 2022, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Ketchikan Gateway Borough; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
Monitor
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Best radon monitors for Ketchikan Gateway Borough homes, compared
Explore
Ketchikan Gateway Borough, Bordering boroughs and census areas
Boroughs and census areas bordering Ketchikan Gateway Borough
Calculated by Radon4110.0%at or above 4 pCi/L
Median 0.6 pCi/L · 4 tests
0.0%at or above 4 pCi/L
Median 0.4 pCi/L · 1 test
Ketchikan Gateway Borough, Cities and towns
Cities and towns in Ketchikan Gateway Borough
About 13,549 people live in Ketchikan Gateway Borough by the Census Bureau's estimate for July 1, 2025, 364 fewer than in 2020 (−2.6%). Spread over its land, that is 2.8 people to the square mile. Ketchikan alone is home to 7,939 of them, 58.6% of the total. Together its 2 incorporated places hold 61.4% of those residents; the other 38.6% live outside any of them. Reported testing is thin here: 2 tests over 2007 to 2016, or 0.1 for every 1,000 residents (2025 estimate), where Alaska as a whole comes to 1.1.
From Ketchikan to Saxman, CDC publishes no figure by town: each reads Ketchikan Gateway Borough's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ketchikan | 7,939 | −2.7% | 58.6% |
| Saxman | 376 | −2.3% | 2.8% |
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).
Ketchikan Gateway Borough, Homes
Homes in Ketchikan Gateway Borough
Of Ketchikan Gateway Borough's 6,659 homes, 55% are detached houses, against 63% across Alaska; 16% are in buildings of five or more homes. The homes are older than Alaska's as a whole: half were built before 1976 (1985 for Alaska), and 28% date from before 1960. 67% of occupied homes are lived in by their owner (Alaska: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Ketchikan Gateway Borough | Alaska |
|---|---|---|
| Housing units | 6,659 | 327,610 |
| Detached houses | 55% | 63% |
| In buildings of 5 or more | 16% | 12% |
| Mobile homes | 3% | 4% |
| Built before 1960 | 28% | 8% |
| Built since 2000 | 13% | 25% |
| Middle year built | 1976 | 1985 |
| Owner-occupied | 67% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.