Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Pend Oreille County, Washington
EPA puts Pend Oreille County in Zone 1, its highest radon zone, and only 20 radon tests from it are on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
34.5%
17.9 pts above WA
- Pend Oreille
- 34.5%
- Washington
- 16.6%
55 tests, 2016
Median result
2.3pCi/L
Below action level
- Pend Oreille
- 2.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2016
Tests reported
55
9th of 14 by tests
- Pend Oreille
- 55
- Clark
- 1,506
Reported to CDC before any fix, 2016
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Washington
3 of 14
Top quarter
- Pend Oreille
- 34.5%
- Stevens
- 42.3%
By share, of 14 with 30+ tests
Read a result for Pend Oreille County
Starts at Pend Oreille County's median, 2.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.3 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. Pend Oreille County's median reported result, 2016.
The data
Pend Oreille County, At a glance
Pend Oreille County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Pend Oreille 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 Pend Oreille County, 2020
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 45.5% |
| 2015 | 36.4% |
| 2016 | 34.5% |
| 2017 | 59.4% |
| 2018 | 0.0% |
| 2019 | 51.4% |
| 2020 | 20.0% |
2020: 20.0%. Across these years the share ran from 0.0% to 59.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 20 tests were reported to CDC for Pend Oreille County over 2020, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).
Pend Oreille County, Compared
Pend Oreille County radon figures, compared
Calculated by Radon411In Pend Oreille County, about 3 in 10 reported tests in 2016 (19 of 55) were at or above EPA's action level. Against the national pool of 31.2%, the gap is 3.3 points higher. Across 37 Washington counties pooled together, 16.6% of tests reached that level, so Pend Oreille County runs 17.9 points above its state.
The newest figure, in 2020, counts only 20 tests (20.0% at or above 4 pCi/L), too few to compare, so this reading uses the 55-test figure.
Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 38.9% (Spokane County) to 42.3% (Stevens County). By share, Pend Oreille County is 3rd of 14 Washington counties with 30 or more tests for the same period.
Year by year, 2016 opened at 34.5% and 2019 closed at 51.4% (up 16.9 points), with 2017 the high at 59.4%. Half the tests came in under 2.3 pCi/L and half over it; the single highest reached 39.3 pCi/L. Below the action level, 21 tests (38.2%) came in under 2 pCi/L, against 67.8% statewide, and 15 tests (27.3%) fell between 2 and 4, against 15.5% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 34.5% 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 55 tests reported; the quietest, 2018, had 7.
Pend Oreille CountyWashington, pooled
51.4% % of tests20.9% % of tests
| Year | Tests | Pend Oreille County, at or above 4 pCi/L | Washington, pooled |
|---|---|---|---|
| 2016 | 55 | 34.5% | 16.6% |
| 2017 | 32 | 59.4% | 19.1% |
| 2019 | 37 | 51.4% | 20.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Pend Oreille County, Geology
The ground under Pend Oreille County
PredictedUSGS's geologic map puts all of Pend Oreille County's mapped land in one class: high radon potential. 99.4% of it lies in the area the map calls Okanogan Highland, to which USGS gives a radon index of 16, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Okanogan Highland | Glaciofluvial outwash and granitic material. Outwash is generally uranium-bearing. | High | 16 | 99.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Pend Oreille County beside the ground around it
Pend Oreille County has more high-potential ground than Washington as a whole: 99.9% of its land against 13.7%. Of the 4 counties that border it, 2 have more high-potential ground, Bonner County, ID the most at 100%.
The map rates the ground, not the air in any home.
Local help
Pend Oreille County, Local resources
Radon testing and mitigation in Pend Oreille County
- Radon ProgramRadon Program, run by Washington State Department of Health, offers free or discounted test kits, and answers questions about testing and mitigation in Washington.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
We have a limited supply of free radon test kits.
- Compare kits
- See the Washington directoryNo professionals are listed in Washington yet. The state program can point you to registered testers and mitigators.
What Washington's program says
- Phone
- 360-236-3200
- doh.radon@doh.wa.gov
What it means
Pend Oreille County, Questions
Questions about radon in Pend Oreille County
Are radon levels high in Pend Oreille County?
In 2020, 20.0% of the radon tests reported to CDC for Pend Oreille County, Washington were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.3 pCi/L. Of 14 Washington counties with 30 or more tests for the same period, 2 reported a higher share; pooled, the state comes to 16.6%.
Which counties border Pend Oreille County?
Pend Oreille County borders 4 counties: Stevens County, WA, Bonner County, ID, Boundary County, ID and Spokane County, WA.
Products
Pend Oreille County, Products
Testing a home in Pend Oreille County
In Pend Oreille County, 34.5% of 55 tests reported to CDC in 2016 reached 4 pCi/L, against 16.6% pooled across Washington. In Zone 1 the year-round level in Pend Oreille 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
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Pend Oreille County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Pend Oreille County
Explore
Pend Oreille County, Bordering counties
Counties bordering Pend Oreille County
Calculated by Radon411- Radon levels in Stevens County, WAEPA zone 1
42.3%at or above 4 pCi/L
Median 3.0 pCi/L · 52 tests · 7.8 points above Pend Oreille County
- Radon levels in Spokane County, WAEPA zone 1
38.9%at or above 4 pCi/L
Median 2.8 pCi/L · 750 tests · 4.4 points above Pend Oreille County
- Radon levels in Bonner County, IDEPA zone 1
No CDC figure for 2016; its page reads it against its own neighbours.
- Radon levels in Boundary County, IDEPA zone 1
No CDC figure for 2016; its page reads it against its own neighbours.
Pend Oreille County, Cities and towns
Cities and towns in Pend Oreille County
Pend Oreille County is growing: the Census Bureau puts it at 14,457 residents on July 1, 2025, up 7.0% from 13,505 in 2020. That works out to 10 people per square mile of land. No town dominates: Newport, the largest, has 2,242 residents, 15.5% of the total. Together its 5 incorporated places hold 23.0% of those residents; the other 77.0% live outside any of them. Testing is reported here more often than across the state: CDC's 55 reported tests for 2016 come to 3.8 for every 1,000 residents (2025 estimate), against 0.6 for Washington.
From Newport to Metaline, CDC publishes no figure by town: each reads Pend Oreille County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Newport | 2,242 | +4.4% | 15.5% |
| Ione | 445 | +2.1% | 3.1% |
| Metaline Falls | 281 | +2.6% | 1.9% |
| Cusick | 190 | +25.8% | 1.3% |
| Metaline | 165 | +1.9% | 1.1% |
5 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).
Pend Oreille County, Homes
Homes in Pend Oreille County
Of Pend Oreille County's 8,036 homes, 75% are detached houses, against 62% across Washington; 18% are mobile homes. Half of its homes were built before 1984, close to Washington's 1984: 22% date from before 1960 and 25% from 2000 or later. Owners live in 77% of the occupied homes (Washington: 64%), so for most households a test and a fix are their own to order.
| Homes | Pend Oreille County | Washington |
|---|---|---|
| Housing units | 8,036 | 3,262,667 |
| Detached houses | 75% | 62% |
| In buildings of 5 or more | 4% | 22% |
| Mobile homes | 18% | 6% |
| Built before 1960 | 22% | 21% |
| Built since 2000 | 25% | 28% |
| Middle year built | 1984 | 1984 |
| Owner-occupied | 77% | 64% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.