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City briefs council on Lake Stevens health, monitoring and treatment options
Summary
City environmental staff told council that Lake Stevens is in generally good health, described monthly monitoring and treatment programs (alum treatments cost about $150,000–$200,000), and reported small, short‑term spikes in perchlorate after fireworks that remain below EPA drinking‑water levels.
City environmental staff delivered an extensive briefing Feb. 24 on Lake Stevens’ water quality, monitoring programs, and management tools.
Shannon Front, the city’s environmental programs manager, explained that the lake is roughly 1,000 acres with a watershed of about 3,500 acres and that phosphorus—more than nitrogen—is the principal nutrient driving algae blooms there. Front described two categories of phosphorus input: external loading (runoff, septic systems, pet waste, fertilizers) and internal loading (phosphorus stored in lake sediments that can be remobilized…
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