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City of Austin Begins Final Treatment of Toxic Algae in Lady Bird Lake

  • On Monday and Tuesday, June 9 and 10, 2025, the City of Austin initiated the concluding applications of its five-year pilot program aimed at combating harmful cyanobacteria in Lady Bird Lake by treating the water with lanthanum-modified clay.
  • The pilot started due to toxic blue-green algae blooms that have threatened human and animal health, killing multiple dogs since 2019 and persisting especially at Red Bud Isle.
  • Crews applied the clay in three locations to bind phosphorus, a key nutrient for algae, making it unavailable and thus reducing algae growth and toxin production.
  • The program cost about $300,000 annually, and although the clay temporarily clouds water, officials called it safe and urged boaters to avoid the application barge during treatment.
  • City officials plan two more clay applications in July and August 2025 and will reassess strategies after completing this final program year to address ongoing toxic algae risks.
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KVUE broke the news in Austin, United States on Sunday, June 8, 2025.
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