Floating plant components susceptible to zebra mussels include the sea chests, keel coolers, piping systems and hulls (Boelman and Fischenich 1995). Of these, sea chests and piping systems are considered to be the most susceptible to serious infestation. Zebra mussel problems related to the sea chest include clogging of the protective grate and the individual water intakes within the sea chest. Piping systems leading from the sea chest, particularly those that stand idle for long periods of time, are subject to clogging from zebra mussels in varying degrees. Shell debris can clog systems that terminate in nozzles. The flow of water available for engine cooling, fire protection, air conditioning, and refrigeration is significantly reduced when such an infestation occurs within the sea chest and/or piping system. The problems associated with each component and applicable zebra mussel control methods are discussed.