Northwest Region

Dramatic sky over the Seattle skyline
Our Northwest Region (NWRO) includes Island, King, Kitsap, San Juan, Skagit, Snohomish, and Whatcom counties.

Topics of interest in the Northwest Region

Puget Sound

About two-thirds of the state’s population lives in the Puget Sound region. Our nation’s second largest marine estuary faces a number of challenges related to population growth and development, as well as habitat loss and multiple sources of pollution. Learn more about the problems the sound faces and what we're doing to protect this environmental, cultural, and economic resource. See more about Puget Sound.

Cleaning up contamination

In Washington state, we've identified over 13,000 contaminated sites in need of cleanup. In the Northwest region, there are over 3,000 identified or active sites. We make progress daily – cleanup work at over 4,000 formerly contaminated sites have been competed in the Northwest region's seven counties. Learn more about our contamination cleanup work.

Cleaning up: Studies of Treoil site now available for comment

We’ve completed our studies of the remaining contamination at the Treoil Industries site and the options for cleaning it up, and we invite your comments.

The next phase in the cleanup process for an industrial processing site in Whatcom County is now underway. We’ve completed our evaluation of the remaining contamination... Continue reading this blog...

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