Alert: Harmful Algal Blooms (HABs) – Discovery Bay & Big Break Regional Shoreline


There are currently “Danger” level advisories for harmful algal blooms in parts of Discovery Bay and at the Big Break Regional Shoreline kayak launch in Contra Costa County. It is recommended to stay out of the water in these areas and to keep pets from coming into contact.

Learn more about these alerts and stay updated on Delta HABs with the HAB Incident Reports Map.

A harmful algal bloom (HAB) is a buildup of blue-green algae that creates a green, blue-green, white or brown coloring on the surface of ponds, lakes and other slow-moving waterways, sometimes occurring as mats or scum.

Blooms are most common between June and September. They grow in warm, stagnant and nutrient-rich water, and are becoming increasingly common both in California and nationwide.

Human exposure to water containing toxic harmful algal 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

How do I keep my dog safe?

If you spot the algae, leave the area and don’t let your dog drink or swim in the water. If your dog has already gotten into a harmful bloom, rinse your pet off immediately in fresh, clean water. Remember to wear gloves to protect yourself. And, if you know you’ve been in contact with the bloom, immediately wash with soap and water.

About Kevin

Mayor - City of Oakley, Manager of Mainframe Operations and Optimization – USS-POSCO INDUSTRIES, Co-Founder and Board Member - Friends of Oakley A Community Foundation, Commissioner - Contra Costa Transportation Authority, Board Member - Tri Delta Transit, Transplan, San Joaquin Joint Powers Authority and RD 2137, Advisory Board – Opportunity Junction
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