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Here is the Oregon Radon Map.
Yellow is a very low "threat' of radon
Orange is a medium "threat" of radon
Red is a very high "threat" of radon
Everyone that argues there is no threat for radon in Oregon always points to this map. The maps were originally developed by the National Geodesic society based on the likelihood of certain mineral deposits being present. The results of suspected radon concentrations based on those maps and actual radon concentrations found by testing were found to be quite different.
Once the EPA was able to gather data from actual radon measurements they revised the maps to reflect those results. However the EPA being a political organization passed these results out to the individual states to review. Of course all of the states said "this can't be right, we need to make some changes to these maps" and they did.
With me so far?
Here is the map for Washington

Notice the red areas? Notice which counties those are on the south end? How about putting those two maps together?

Geologists tell us that there is absolutely nothing in, or below, the Columbia river dividing our two lovely states that would make it so the Vancouver area would have high levels of radon while keeping Portland medium.
What's the difference the you ask? People in Vancouver test for radon much more often than people in Portland and so the State has to update their maps because they have hard numbers proving there is too much radon entering houses. In Portland people's perception that we don't have it here so we don't need to test for it means there are no results being presented to the State so they don't update their maps.
Testing is easy and it is not a deal killer contrary to agent's fears. Even if you don't use us recommend it to your clients and have the house tested to be safe.
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