LA Beaches Warn of Bacteria Risks as Heat Wave Hits California

Officials urge public to avoid swimming, surfing, and playing in ocean waters at affected beaches

Mar. 13, 2026 at 2:53pm

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As a heat wave slams California, Los Angeles County officials have issued bacteria warnings for several beaches across Southern California. The warnings come as temperatures are expected to reach 90 to 100 degrees across LA on Friday, with the National Weather Service issuing a heat advisory. The bacterial levels in the ocean water at the affected beaches have elevated, increasing the risk of illness for those who swim, surf, or play in the water.

Why it matters

The bacteria warnings highlight the potential public health risks associated with extreme heat events, which are becoming more frequent and intense due to climate change. The warnings also underscore the need for officials to closely monitor water quality and provide timely alerts to protect beachgoers, especially during periods of high temperatures.

The details

The beaches under the bacteria warning include Malibu Lagoon at Surfrider Beach, Leo Carrillo State Beach in Malibu, Pulga storm drain at Will Rogers State Beach, Castlerock Storm Drain at Topanga County Beach, Escondido Creek at Escondido State Beach, Marie Canyon Storm Drain at Puerco Beach, Mother's Beach in Marina Del Rey, Santa Monica Canyon Creek at Will Rogers State Beach near Tower 18, and Santa Monica Pier in Santa Monica. Officials have advised the public to avoid swimming, surfing, and playing in the ocean waters at these locations.

  • On Thursday, Los Angeles set new record high temperatures.
  • On Friday, temperatures are expected to reach 90 to 100 degrees across LA.

The players

Los Angeles County

The local government authority that issued the bacteria warnings for several beaches in the region.

National Weather Service

The federal agency that has issued a heat advisory for the Los Angeles area on Friday.

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The takeaway

This incident highlights the need for beachgoers to be aware of water quality advisories, especially during extreme heat events, and to take appropriate precautions to protect their health. It also underscores the importance of ongoing monitoring and communication efforts by local authorities to ensure public safety at beaches.