Ecology issues asbestos reminder near Sumas Mountain

Recreationists are urged not to disturb any creek beds or sediment piles in the area.

By Dianna Hawryluk June 26, 2026 11:13 am

Aerial map of the Swift Creek watershed near Nooksack, showing floodplain in light blue and a large orange-yellow area to the east. — ContributedA map of the landslide (yellow) and the Swift Creek watershed (light blue). Courtesy of Washington state Dept. of Ecology

NOOKSACK, WA (MyBellinghamNow.com) – Outdoor recreationists are being issued a seasonal reminder as dry weather kicks into high gear.

The Washington state Department of Ecology is sending out postcards reminding people to be cautious if they plan to visit areas near Sumas Mountain.

A slow-moving landslide on the west side of the mountain sends bits of naturally-occurring asbestos down Swift Creek and part of the Sumas River. When the riverbeds dry up, the asbestos can become airborne if it’s disturbed.

Ecology officials are asking people not to walk, bike or otherwise travel through the creek beds or through any sediment piles.

Airborne asbestos can cause serious resperatory issues, including lung cancer.

Ecology crews have been working to limit the public’s exposure to asbestos in the area since 2021. Currently, they’re building a storage site for contaminated sediment.