The beach by the Santa Monica Pier is one of the dirtiest beaches in California, so it's not a good place to swim.
These beaches have lots of yucky stuff in the water, like germs from rain and sewer spills.
It's important to stay away from places where the water flows out of drains and to wait a few days after it rains before going in the ocean.
Beaches that are near busy cities and close to rivers are more likely to have dirtier water.