Abstract: Systems and methods for decontaminating a watercraft, the system including a water reservoir; a water heater reservoir fluidly connected to the water reservoir for receiving water therefrom, the water heater reservoir being configured to heat water received therein to a temperature greater than an injection temperature; a mixing valve fluidly connected to the water reservoir and the water heater reservoir, the mixing valve being configured to: receive water from the water reservoir and the water heater reservoir, and output water at approximately the injection temperature; and a connection unit fluidly connected to an outlet of the mixing valve, the connection unit being configured for fluidly connecting to an inlet of an internal water conduit of the watercraft and injecting water therein.