Long Lake is a 330-acre recreational lake in Lacey, Washington, supporting boating, fishing, water skiing, and public access through its park and boat launch. As an important resource for residents and visitors, maintaining water quality is critical to its long-term value.

For years, the lake experienced recurring harmful algal blooms driven by excess phosphorus and eutrophic conditions. A severe bloom in 2020 produced toxins and strong odors, generating public concern and underscoring the need for a long-term solution to reduce bloom frequency and improve water quality.

In 2021, Thurston County partnered with AquaTechnex and EutroPHIX to implement a long-term phosphorus management strategy. After reviewing historical water quality data and sediment conditions, the team recommended biannual applications of EutroSORB® G to bind phosphorus in lake sediments and reduce internal nutrient recycling.

The multi-year restoration plan was designed to deliver measurable water quality improvements while fitting within existing lake management budgets. By targeting phosphorus at its source, the program focused on addressing the root cause of recurring algal blooms rather than treating symptoms alone.