San Diego County Issues Warning About Bacteria in Coastal Waters After Rains

Levels of bacteria can rise significantly in ocean waters, especially near storm outlets that discharge urban runoff.

Published on Feb. 22, 2026

The coastal waters of San Diego County are under a general rain advisory due to contamination by urban runoff following last week's rain, according to the Department of Environmental Health and Quality. Swimmers, surfers and other ocean users are warned that levels of bacteria can rise significantly in ocean waters, especially near storm drains, creeks, rivers and lagoon outlets that discharge urban runoff.

Why it matters

Heavy rains can lead to increased levels of bacteria in coastal waters, posing a potential health risk to beachgoers. This advisory helps inform the public about water quality conditions and encourages them to avoid activities like swimming and surfing for a period of time after rainfall to protect their health.

The details

The warning applies to beaches from San Onofre State Beach south to Border Field State Park, including Mission Bay and San Diego Bay. Activities such as swimming, surfing and diving should be avoided for 72 hours following rain, according to the advisory. The most recent rain was last Friday, and the anticipated lift date for the advisory was scheduled for Monday at 2 p.m.

  • Last Friday, the most recent rain occurred.
  • The advisory is in effect for 72 hours following the rain.
  • The anticipated lift date for the advisory is scheduled for Monday at 2 p.m.

The players

Department of Environmental Health and Quality

The government agency that issued the advisory warning about bacteria levels in San Diego's coastal waters.

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What’s next

Updated statuses of local beaches can be found at sdbeachinfo.com.

The takeaway

This advisory highlights the importance of being aware of water quality conditions after heavy rains and taking precautions to protect public health by avoiding activities in contaminated waters.