Bacteria, chemicals and trash runoff could make SoCal beaches a hazard after rain, officials warn

The advisory is in place until 8 a.m. Tuesday and may be extended if it rains more, the health department said in a news release.

Such warnings are typical after rainfall, which can cause ocean and bay waters to become contaminated with bacteria, chemicals, trash, and other health hazards from city streets and mountain areas, the health department said. Those risks are especially acute for waters near storm drains, creeks and rivers, it said. People who enter the water in those areas could become sick.

The warning was prompted by a storm system that brought scattered showers to the area Sunday into Monday. Dry and warm weather is expected to return after Monday.