Lakes are a critical freshwater resource providing an array of recreational opportunities, valuable habitat for fish and wildlife, and tranquil beauty. Our geologic history has led this area to be rich in lakes with Snohomish County having over 400 lakes. While the majority are very small or located in the Cascade mountains, there are around 60 lakes located in the populated lowland areas.
The following lakes are posted for an ongoing toxic algae bloom. Blooms look like green or blue surface scums or algae clumps. While posted, follow the guidelines on the WARNING sign.
Learn more about toxic algae.
Updated November 14, 2023.
No area lakes are currently experiencing toxic algae blooms.
See toxin testing results at www.nwtoxicalgae.org.
Free, online, and on-demand so you can take at any time! Learn how to keep your septic system running properly for years to come and how to receive up to $500 in septic system care rebates through the County's Savvy Septic program. Be sure to save and send us your certificate of completion if participating for LakeWise. Workshop available here!
Join a professional landscape designer to learn how to grow the lawn you have always wanted - naturally and with minimal time and expense.
Next Workshop - Spring 2024
If you would like to receive email or text alerts for most lakes in unincorporated Snohomish County, please go to the Lakes Email News page and click the link next to the lake you are interested in to sign up.
Marisa Burghdoff
Water Quality Specialist
Ph: 425-388-3204
Jen Oden
Water Quality Specialist
Ph: 425-262-2601
Dominick Leskiw
Water Quality Analyst
Ph: 425-312-0623
email us at lakes@snoco.org