Los Angeles County beachgoers, think twice before you dive in. The Los Angeles County Department of Public Health has issued a rain advisory, warning residents to avoid ocean water contact until 11:30 pm tonight due to heightened bacteria risks, particularly near storm drains, creeks, and rivers following recent rainfall.

The advice extends to avoiding not only the ocean and bay waters but also any runoff that may be present on beaches. The reason is that urban runoff after a storm can carry a smorgasbord of contaminants – bacteria, chemicals, debris, even trash – that flow from city streets, down the mountains and into our coastal playgrounds. According to the official advisory, "Individuals who enter the water in these areas could become ill." And the caution necessarily extends for 72 hours post-rainfall, when bacteria levels are most likely to be elevated.

If you're wondering whether to pack a swimsuit or a raincoat, maybe opt for the latter. The advisory remains in effect until at least tonight, but with the temperamental nature of Southern California weather, there's a chance that advisories might extend further if the rains continue. For those eager for a saltwater fix, though, keep an ear out – updates on the status of beach waters can be obtained 24 hours a day via the county's beach closure hotline at 1-800-525-5662.

Truth be told, while the blue Pacific might be inviting, there's nothing refreshing about swimming in what could essentially be urban silt soup. Information on which spots to avoid is readily available online, so do your health a favor and check before you choose to wade in. Ignoring these advisories might not just spoil a day at the beach but could put swimmers at risk for illness. Remember, no one wants a bout of post-dip nausea to be the souvenir of their seaside excursion.