Diablo Cove is one of the most popular surfing areas in Los Angeles. But unfortunately because of a storm drain, the water has been polluted and by that endangered the health of those surfing there. Cody and Neely take water samples there and discover dangerous levels of E Coli bacteria. But two teenagers named Stick and Daryl surf there anyway. When one of them gets sick and must be rescued by Cody and Neely, they discover that his back is completely covered with nasty rashes. After that, the lifeguards close the beach.

After the close down, Mitch contacts Dave at the Surfrider Foundation. The Surfrider Foundation is a non-profit organization created to clean up shoreline pollution. Dave has wanted the storm drain diverted for years, but the county always refuse. At the beach where the Surfrider Foundation is having a meeting, Stephanie meets her ex-husband Billy again. He has retired from his job in New York and moved back to L.A. He did so when he suffered from a minor heart attack. Now he wants to rekindle their romance. Stephanie seems interested at first, but when Caroline confronts Stephanie about it, Billy decides to leave for good.

Mitch decides that the best way to raise money for the diversion of the storm drain is to arrange for a benefit concert. Then it turns out that Mitch knows The Beach Boys. He sang with them when he was eight. His brother Buzz was a friend of theirs. The Beach Boys decide to hold a concert on the beach. Also, Neely teaches Cody how to surf and at the concert she kisses him. It's also revealed that C.J. is in France with Matt.