Cal. Harb. & Nav. Code § 132

Every person who, within the anchorage of any port, harbor, or cove of this State, into which vessels may enter for the purpose of receiving or discharging cargo, throws overboard from any vessel all or any part of the ballast, or who otherwise places or causes to be placed in such port, harbor, or cove, any obstructions to navigation, is guilty of a misdemeanor.