Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Bristol Bay Borough, Alaska
EPA puts Bristol Bay Borough in Zone 3, its lowest radon zone. 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, 312 miles
- Anchorage Municipality
- 3.1%
- Alaska
- 11.5%
Share at 4+ pCi/L, 130 tests, 2022
Ground above low
98.0%
18.7 pts above Alaska
- Bristol Bay Borough
- 98.0%
- Alaska
- 79.2%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Bristol Bay 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
Bristol Bay Borough, At a glance
Bristol Bay Borough at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Moderate across 98% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
No CDC test figures here
CDC has published no radon test figures for Bristol Bay Borough. Anchorage Municipality, 312 miles away, is the nearest county with a figure in 2022.
Bristol Bay Borough, Compared
Bristol Bay Borough radon figures, compared
Calculated by Radon411Bristol Bay Borough has no radon test figure of its own from CDC, whose counts in 2022 name 19 other Alaska counties and leave it out. Pooled across 19 Alaska counties, 11.5% of reported tests reached that level; across every county in the country with a figure, 23.9%.
The nearest counties with a figure are Anchorage Municipality (312 miles away) at 3.1%, Matanuska-Susitna Borough (346 miles away) at 14.3% and Fairbanks North Star Borough (534 miles away) at 19.4%. 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 Bristol Bay Borough in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 98% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Bristol Bay Borough, Geology
The ground under Bristol Bay Borough
PredictedUSGS's geologic map puts all of Bristol Bay Borough's mapped land in one class: moderate radon potential. The map puts 84.7% of Bristol Bay Borough in the area it calls Central Alaska and 13.3% in Alaska-Aleutian Province. USGS gives the first a radon index of 11 and the second 9, both in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Alaska | Uraniferous granites, felsic intrusives; clastic and carbonate sedimentary rocks; metamorphic, and volcanic rocks. | Moderate | 11 | 84.7% |
| Alaska-Aleutian Province | sedimentary and mafic volcanic rocks, glacial deposits; felsic intrusives; metamorphic rocks | Moderate | 9 | 13.3% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Bristol Bay Borough beside the ground around it
Bristol Bay Borough has more moderate-potential ground than Alaska as a whole: 98.0% of its land against 79.2%. Lake and Peninsula Borough, the one borough or census area that borders it, has more moderate-potential ground: 99.2%.
The map rates the ground, not the air in any home.
Local help
Bristol Bay Borough, Local resources
Radon testing and mitigation in Bristol Bay 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
Bristol Bay Borough, Questions
Questions about radon in Bristol Bay Borough
Are radon levels high in Bristol Bay Borough?
No CDC testing statistics are published here for Bristol Bay Borough, Alaska yet. Of the 3 nearest counties with a figure, within 534 miles, the share of tests at or above 4 pCi/L runs from 3.1% to 19.4%.
Which counties border Bristol Bay Borough?
Bristol Bay Borough borders 1 borough or census area: Lake and Peninsula Borough.
Products
Bristol Bay Borough, Products
Testing a home in Bristol Bay Borough
No CDC figure names Bristol Bay Borough; the nearest county with one, Anchorage Municipality (312 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. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Bristol Bay Borough.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorForensics Detectors
FD-65-RADON rechargeable radon detector with a color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Bristol Bay Borough, Bordering boroughs and census areas
Boroughs and census areas bordering Bristol Bay Borough
Calculated by Radon4110.0%at or above 4 pCi/L
Median 0.5 pCi/L · 1 test
Bristol Bay Borough, Residents
Who lives in Bristol Bay Borough
The Census Bureau estimates 847 residents in Bristol Bay Borough for July 1, 2025, 20 more than in 2020 (+2.4%). Spread over its land, that is 1.8 people to the square mile. CDC publishes no radon test count for Bristol Bay Borough; across Alaska its counts for 2022 come to 0.4 tests for every 1,000 residents (2025 estimate).
Census lists no incorporated place in Bristol Bay Borough: every home in it reads the county's figures.
Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Bristol Bay Borough, Homes
Homes in Bristol Bay Borough
Bristol Bay Borough is a place of houses on their own lots: 77% of its 831 homes are detached single-family houses, against 63% across Alaska. Half of its homes were built before 1984, close to Alaska's 1985: 6% date from before 1960 and 11% from 2000 or later. 52% 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 | Bristol Bay Borough | Alaska |
|---|---|---|
| Housing units | 831 | 327,610 |
| Detached houses | 77% | 63% |
| In buildings of 5 or more | 8% | 12% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 6% | 8% |
| Built since 2000 | 11% | 25% |
| Middle year built | 1984 | 1985 |
| Owner-occupied | 52% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.