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North Cove early March morning

Lake Health

Lake Stevens is one of our community’s most treasured natural resources, and protecting its health and vitality is a top priority. By leveraging historic lake-level data, annual alum treatments to manage phosphorus, and targeted aquatic vegetation management, the city is taking proactive steps to ensure the long-term health of our lake. These efforts not only safeguard the lake’s ecological balance but also promote sustainable recreational opportunities for residents and visitors alike.

Community input is a vital part of these initiatives, as local knowledge and feedback help shape how we address emerging challenges and refine existing strategies. Whether it's accessing real-time data through our interactive lake-level dashboard, staying informed about alum treatment schedules, or learning about aquatic vegetation control, residents play a crucial role in preserving the integrity of the lake. Together, we can make practical and impactful decisions for the future of one of our city’s most iconic assets.

2026 Lake Stevens Proposed Aquatic Plant Control Area Map *updated 7/21/2026

2026 Aquatic Vegetation Treatment

Opportunities to Engage

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Get notified on upcoming engagements and the latest project related news.

"Aquatic plant treatments under our Aquatic Plant and Algae Management plan are to occur *July 28th*. Please see the included map of proposed treatment areas, and 2026 Aquatic Vegetation Treatment update for more info. Sign up below for email notifications to receive these updates."
Seth Waltz
Surface Water Specialist

Project Phases

2026 Aquatic Plant Survey

Spring Survey
A spring survey of aquatic plant growth will be conducted to locate and identify invasive species. The information collected during this survey will be used to help develop this seasons treatment plan.

2026 Nuisance and Noxious Aquatic plant treatment

Aquatic plant treatments are scheduled for Tuesday July 28th.
Targeted treatments will be applied to control invasive aquatic plant species in the lake. Partial treatments may also be conducted to manage nuisance vegetation and improve recreational use, particularly around public beaches and areas with dense native growth.

2026 Post Treatment Survey

Fall of 2026
A fall survey of the lake will be conducted to evaluate the effectiveness of the season’s treatments. A post‑treatment survey summary will also be prepared and made available on this page. Please review post‑treatment surveys from previous years

Updates