The Big Bay Boom is an annual Independence Day fireworks display in San Diego, California.

[4] Each year, roughly half a million people congregate on the shores of San Diego Bay to watch the show.

Sandy Purdon, a marina owner and former president of the Port Tenants Association, got the idea to do a similar but larger fireworks show from the San Diego side of the bay.

All four locations shoot off identical, simultaneous pyrotechnics, coordinated with a patriotic sound track played over a local radio station.

[7] Starting in 2010 the future of the fireworks show has been called into question due to threatened legal action by the Coastal Environmental Rights Foundation, which claims that additional pollution and environmental permits are required for fireworks displays.

On Wednesday, July 4, 2012, 7,000 fireworks,[1] intended for a 17-minute display, discharged prematurely and simultaneously from all four barges and the pier.