Do Edmonds or Lynnwood have the highest radon levels in the greater Puget Sound area?

Snohomish County ranks medium risk for potential radon gas risk in Puget Sound. Most of Puget Sound is medium risk.

Counties closest to the Cascade and Olympic mountain ranges have the highest risk potential.

Radon is a naturally occurring odorless, tasteless, colorless gas generated by radioactive metal in rocks as they break down. Gas can be found in poorly ventilated basements, seeping in through foundation cracks. 

It is inhaled and can cause lung cancer, especially in people who smoke. The federal Environmental Protection Agency has information about radon.

This detailed, interactive Washington State radon map has general radon levels and risk potential for every ZIP code. It also provides the date of the most recent radon test. This cannot tell you the radon level in your home.

How radon gas enters a house with all residential options outline diagram.