Is radon high in Vancouver, Washington?

Low. Averaging the model's ZIP-code predictions across Vancouver (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and about 1.3× the Washington average of 1.6. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Vancouver ranks 4 of 29 Washington cities on this site.

Which Vancouver ZIP codes have the highest radon?

Predictions for the 10 modeled ZIP codes in Vancouver range from 1.1 to 2.4 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 40% at or above 2. That spread is why the ZIP table below matters more than the city-wide number.

Should I test for radon in Vancouver?

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

What does EPA Radon Zone 1 mean for Vancouver?

Vancouver sits mainly in Clark County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 2.0 pCi/L does not line up with Zone 1, 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 Vancouver, Washington

LowEPA Zone 1

Predicted long-term basement average of 2.0 pCi/L (model estimate) across the 10 modeled ZIP codes in Vancouver - close to the US average of 1.8, about 1.3× the Washington average of 1.6. Ranked #4 of 29 Washington cities on this site. Most of the city lies in Clark County.

Test Vancouver, WA once anyway - radon varies house to house

The predicted basement average here is 2.0 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.

Get a short-term test kit →Or track it with a continuous monitor

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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.

2.0 ± 0.07

pCi/L predicted basement mean (model SD)

1.1 ± 0.12

pCi/L predicted upstairs (above-ground) mean

1.1-2.4

range of ZIP-level basement predictions in the city

of Vancouver ZIPs predicted ≥ 4 pCi/L (40% ≥ 2)

What this means for Vancouver

The typical Vancouver home is predicted below 2 pCi/L, the lowest band. That describes the average house; the ZIP-level predictions inside the city still span 1.1 to 2.4 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 city's land in each ZIP (Census 2020 ZCTA-to-place relationship file). Note that the EPA classifies Clark County as Zone 1 while the newer model predicts 2.0 pCi/L for Vancouver; where they disagree, we grade on the model but show both.

Comparable Washington cities: Yakima (2.0), Spokane (2.1), Kennewick (1.7), Pasco (1.7).

ZIP codes in Vancouver

ZIPs that overlap the city, 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
98660	16%	2.3 ± 0.06	1.0	Moderate
98661	16%	2.4 ± 0.09	1.3	Moderate
98683	15%	1.7 ± 0.08	0.8	Low
98682	12%	1.6 ± 0.07	0.8	Low
98684	12%	1.8 ± 0.06	1.3	Low
98664	11%	2.2 ± 0.07	1.5	Moderate
98663	8%	2.1 ± 0.06	1.2	Moderate
98662	8%	1.9 ± 0.06	1.0	Low
98607	2%	1.1 ± 0.11	0.8	Low
98665	2%	1.8 ± 0.06	1.0	Low

Testing help in Washington

Washington's radon program page is at doh.wa.gov and, when we checked it, offered a limited supply of free radon test kits. 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.

Vancouver radon questions

Is radon high in Vancouver, Washington?: Low. Averaging the model's ZIP-code predictions across Vancouver (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.0 pCi/L - close to the US average of 1.8 and about 1.3× the Washington average of 1.6. That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Vancouver ranks 4 of 29 Washington cities on this site.
Which Vancouver ZIP codes have the highest radon?: Predictions for the 10 modeled ZIP codes in Vancouver range from 1.1 to 2.4 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 40% at or above 2. That spread is why the ZIP table below matters more than the city-wide number.
Should I test for radon in Vancouver?: Yes, once. The EPA recommends testing every home regardless of area. A short-term kit costs little and settles the question for your house; Vancouver's low predicted average describes the typical home, not yours.
What does EPA Radon Zone 1 mean for Vancouver?: Vancouver sits mainly in Clark County, which the EPA classifies as Zone 1 - highest potential (predicted average > 4 pCi/L). The zone map dates from 1993 and covers whole counties. The newer model's city average of 2.0 pCi/L does not line up with Zone 1, 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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