Cathcart Landfill

The Cathcart landfill is a closed, 60-acre municipal solid waste landfill regulated under Chapter 304 Washington Administrative Code.

The Site was constructed in 1980 and closed in 1992.  It was the first landfill in Washington constructed with a bottom liner in accordance with new federal standards.  The landfill is bounded by private residential property to the northwest, north and east, and by other Snohomish County facilities to the south and west.

Post-closure care is required until the landfill generates little to no leachate and landfill gas, landfill settlement has stabilized, and groundwater quality criteria have been satisfied.

Currently groundwater is sampled semiannually for most wells; additionally, landfill gas is sampled quarterly, and surface water is sampled semiannually.

The 2020 and 2021 annual reports are located in the electronic documents on the left side of this webpage.

 Snohomish County Public Works manages post-closure care for the landfill.

Snohomish County Health Department is the jurisdictional health department that permits the landfill. For more information, please email EHQuestions@snohd.org or call (425) 426-4607 and reference Cathcart Landfill.

Ecology's Solid Waste Management Program maintains regulatory standards and provides technical assistance to the jurisdictional health department. 

Permitted landfills are potentially subject to the state’s cleanup law, the Model Toxics Control Act (MTCA) if there has been a release of hazardous substances from the landfill. Ecology has not determined that there has been a release from the landfill that is subject to MTCA.

What's In My Neighborhood shows contamination cleanup sites in Washington state. Ecology works to clean up these sites to protect the health of people, plant, and animals. Cleanups are construction projects that remove, treat, or contain potentially harmful substances.

To report an environmental problem or concern, any time, day or night, use the online reporting form. 

Counties: Island, King, Kitsap, San Juan, Skagit, Snohomish, and Whatcom

Email: nwroerts@ecy.wa.gov
Phone: 206-594-0000

Ecology is committed to providing people with disabilities access to information and services. To request an ADA accommodation, contact Ecology by phone at 360-407-6831 or email at ecyadacoordinator@ecy.wa.gov. For Washington Relay Service or TTY call 711 or 877-833-6341.  Visit Ecology’s website for more information.

​If you speak a non-English language, free language services are available.