The Coast Guard will enforce numerous safety zones within the San Francisco Captain of the Port area of responsibility during the dates and times specified below. This action is necessary to protect personnel, vessels, and the marine environment from the hazards associated with the fireworks displays. During the enforcement period, unauthorized persons or vessels are prohibited from entering into, transiting through, or remaining in the regulated areas, unless authorized by the Patrol Commander (PATCOM) or an Official Patrol including any Federal, State, or local law enforcement agencies on scene to assist the Coast Guard in enforcing the regulated area.
Source: Federal Register USCG
Link: Safety Zone; Northern California and Lake Tahoe Area Annual Fireworks Events