Is radon high in Aloha, Oregon?

Low. Averaging the model's ZIP-code predictions across Aloha (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.6 pCi/L - close to the US average of 1.8 and close to the Oregon average of 1.7. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Aloha ranks 10 of 13 Oregon cities on this site.

Which Aloha ZIP codes have the highest radon?

Predictions for the 1 modeled ZIP codes in Aloha range from 1.6 to 1.6 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 0% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.

Should I test for radon in Aloha?

Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Aloha's low predicted average describes the typical home, not yours.

What does EPA Radon Zone 2 mean for Aloha?

Aloha sits mainly in Washington County, which the EPA classifies as Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 1.6 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

Radon levels in Aloha, Oregon

LowEPA Zone 2

Predicted long-term basement average of 1.6 pCi/L (model estimate) across the 1 modeled ZIP codes in Aloha - close to the US average of 1.8, close to the Oregon average of 1.7. Ranked #10 of 13 Oregon cities on this site. Most of the census-designated place lies in Washington County.

Test Aloha, OR once anyway - radon varies house to house

The predicted basement average here is 1.6 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

1.6 ± 0.07

pCi/L predicted basement mean (model SD)

0.8 ± 0.10

pCi/L predicted upstairs (above-ground) mean

1.6-1.6

range of ZIP-level basement predictions in the city

of Aloha ZIPs predicted ≥ 4 pCi/L (0% ≥ 2)

What this means for Aloha

The typical Aloha home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.6 to 1.6 pCi/L.

The city figure is not a separate estimate: it is the mean of the model's ZIP-code predictions, weighted by the share of the census-designated place's land in each ZIP (Census 2020 ZCTA-to-place relationship file). Note that the EPA classifies Washington County as Zone 2 while the newer model predicts 1.6 pCi/L for Aloha; where they disagree, we grade on the model but show both.

Comparable Oregon cities: Eugene (1.6), Springfield (1.6), Gresham (1.6), Beaverton (1.5).

ZIP codes in Aloha

ZIPs that overlap the census-designated place, largest share of its land first. Predicted basement and upstairs means are model estimates; ZIPs the model does not cover show a dash.

ZIP	Share of city	Basement	Upstairs	Grade
97003	45%	—	—	no model
97078	43%	—	—	no model
97007	12%	1.6 ± 0.07	0.8	Low

Testing help in Oregon

Oregon's radon program page is at www.oregon.gov and, when we checked it, offered a free short-term test kit for residents of higher-radon areas of Oregon. EPA state radon contacts page. If a test comes back at 4 pCi/L or higher, mitigation typically costs $800-$2,500 installed; use EPA find-a-professional and read the mitigation guide.

Aloha radon questions

Is radon high in Aloha, Oregon?: Low. Averaging the model's ZIP-code predictions across Aloha (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 1.6 pCi/L - close to the US average of 1.8 and close to the Oregon average of 1.7. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Aloha ranks 10 of 13 Oregon cities on this site.
Which Aloha ZIP codes have the highest radon?: Predictions for the 1 modeled ZIP codes in Aloha range from 1.6 to 1.6 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 0% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.
Should I test for radon in Aloha?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Aloha's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 2 mean for Aloha?: Aloha sits mainly in Washington County, which the EPA classifies as Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 1.6 pCi/L does not line up with Zone 2, which is common - the EPA itself says high-radon homes exist in every zone. Neither replaces a test of your own home.

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