Why is the water red in San Francisco?
Why is the water red in San Francisco? The vibrant pink hue comes from a natural source: halobacterium and microscopic algae. As the water gets saltier, some microbes can't hack it and they die off. But others are specially adapted to salty conditions and they flourish, changing the color of the water.
Is it safe to swim in San Francisco Bay?
Beaches in San Francisco are not safe for swimming, and that goes double for Ocean Beach, which has the worst rip currents and most drownings. More information on rip currents from the United States Lifesaving Association.
Can you swim in San Francisco water?
Swimming is not recommended here due to strong currents and cold water. If you do want to go for a dip, Ocean Beach is often considered San Francisco's most popular, with people flocking to it for swimming, surfing, kayaking, and surf fishing.