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Locations and reports
Radon in Portland, Oregon
Portland lies in 3 counties, in EPA Zones 2 and 3. Homes with elevated levels occur in all three zones, so the only way to know your home's level is to test it.
Data checked By Radon411Methodology
- Predicted
- Zones 2 and 3across the 3 counties Portland lies in
- Measured
- By countyEach county's own CDC figures are set side by side below.
- Your home
- Test to knowNo area figure here is a reading of your home.
The data
Portland, What is published
What is published for Portland
Information:
Radon data is published by county, not by city
Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for Portland, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.
Each county has its own CDC test figures, shown below side by side. About 635,109 people live in Portland.
Portland, Counties
Portland's counties, side by side
MeasuredEach county's own EPA zone and its own published CDC figures for 2023, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
- Clackamas County
- EPA zone
- Zone 3: Lower predicted potential
- At or above 4 pCi/L
- 15.9%
- Median result
- 1.6 pCi/L
- Tests reported
- 321 tests
- Annual years on file
- 10
- Multnomah County
- EPA zone
- Zone 2: Moderate predicted potential
- At or above 4 pCi/L
- 27.8%
- Median result
- 2.0 pCi/L
- Tests reported
- 792 tests
- Annual years on file
- 10
- Washington County
- EPA zone
- Zone 2: Moderate predicted potential
- At or above 4 pCi/L
- 11.4%
- Median result
- 1.3 pCi/L
- Tests reported
- 396 tests
- Annual years on file
- 10
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Clackamas County | Zone 3: Lower predicted potential | 15.9% | 1.6 pCi/L | 321 tests | 10 |
| Multnomah County | Zone 2: Moderate predicted potential | 27.8% | 2.0 pCi/L | 792 tests | 10 |
| Washington County | Zone 2: Moderate predicted potential | 11.4% | 1.3 pCi/L | 396 tests | 10 |
The median reported pre-mitigation result for 2023 was 1.6 pCi/L in Clackamas County, 2.0 pCi/L in Multnomah County and 1.3 pCi/L in Washington County.
CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2023.
Radon Action Brief
National Radon Action MonthPre-sale
The radon brief for Portland, in one dated file.
- Your area's radon record, explained. EPA's zone and any CDC tests.
- Your plan to test this week. Which test, where it goes, how long.
- Fix costs and pros near you. Costs, EPA's checklist, listed pros.
Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25Sale ends January 31, then $25
Local help
Portland, Professionals
Radon professionals listed in Portland
Businesses whose listed city is Portland, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Portland: 1 of 6
12 listings with Portland as the city. See radon mitigation and testing in Portland, or all radon professionals in Oregon.
Portland, Local resources
Local resources for Portland
Who to ask in Oregon: its radon program, test kits and professionals.
- Oregon Radon Awareness ProgramOregon Health AuthorityOregon’s radon program answers questions about testing, mitigation and the rules where you live.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Oregon Radon Awareness Program provides a FREE short-term radon test kit to those living in areas of Oregon where little radon testing has been done.
- Compare kits
- Professionals in Oregon12 listings cover Portland.
What Oregon's program says
- Radon.program@dhsoha.state.or.us
What it means
Portland, Questions
Questions about radon in Portland
What radon zone is Portland in?
EPA's Map of Radon Zones classifies counties, not cities. Multnomah County and Washington County are in Zone 2 (moderate predicted potential); Clackamas County is in Zone 3 (lower predicted potential). The counties Portland lies in do not share one zone, so no single zone is given for Portland. A zone is a prediction for a whole county and never tells you the level in one home.
How many radon tests come back high in Portland's counties?
For 2023, the share of radon tests reported to CDC that were at or above 4 pCi/L was 15.9% in Clackamas County (321 tests), 27.8% in Multnomah County (792 tests) and 11.4% in Washington County (396 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.
Should I test my home in Portland?
Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.
The answers use the published figures of Clackamas County, Multnomah County and Washington County, the counties Portland lies in.
Explore
Portland, Next steps
What to do next
What to do next: 1 of 4