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Posted on: June 21, 2022

Watch for Harmful Algae Blooms

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Contra Costa Health Services advises caution on the part of anyone who boats, fishes or swims in or around Discovery Bay after large blooms of blue-green algae were discovered in multiple locations in and around the community. 

A bloom is a buildup of blue-green algae, or cyanobacteria, that creates a green, blue-green, white or brown coloring on the surface of slow-moving waterways.

Human exposure to water containing toxic harmful algae blooms, for example by direct body contact or ingestion, can result in a number of symptoms including the following:

  • Rashes
  • Eye, nose, mouth or throat irritation
  • Allergic reactions
  • Headache
  • Gastrointestinal upset, such as abdominal pain, nausea, vomiting and diarrhea

Learn more about harmful algae blooms.

See Health Services press release for more information and resources.

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