The Department of Environmental Health issued a general advisory for San Diego County's coastal waters Saturday.
The advisory warns swimmers, surfers, and other ocean users that the levels of bacteria can rise significantly in ocean and bay waters, especially near storm drains, creeks, rivers, and lagoon outlets that discharge urban runoff.
Activities such as swimming, surfing and diving should be avoided in all coastal waters for 72 hours following rain as elevated bacteria levels can persist after a rainstorm.