Noxious and Nuisance Plant Treatment of Lake Stevens

Lake Stevens will begin treating invasive aquatic plants with herbicides from July 21, 2025, weather permitting. Since 2011, the city has significantly reduced Eurasian Milfoil, which previously threatened the lake's ecosystem. Curly Leaf Pondweed was recently discovered, prompting further action. Residents must adhere to swimming precautions for 24 hours after treatment and should look for signage in treatment areas. The city's Noxious Aquatic Weed and Phosphorus Management Program conducts annual surveys to monitor and manage these invasive species.

These efforts are vital for preserving the health and recreational quality of Lake Stevens. The lake has a history of invasive plants, which have posed challenges for local wildlife. Continued treatment and monitoring will help ensure the lake remains a safe environment for residents and visitors.