A portable, fully self-contained pressure wash-down system operates in a storage mode for storing and hermetically sealing system components when the system is not in use, and works in an operation mode for allowing portable operation of the system. The system includes a container adapted to house the system and a lid connected to the container by a hinge. The lid sealingly engages a top portion of the container to store and protect system components when the system is in a storage mode. The system includes a pump disposed in the container. The pump includes a low pressure inlet for delivering low pressure water to the pump and a high pressure outlet for delivering pressurized water from the pump. The system also includes an intake line having first and second ends, wherein the first end of the intake line receives water from a water source and the second end is connected to the pump inlet. The first end of the intake may contain a filter for excluding harmful debris from the pump or other system components. The system may also include a filter between the intake line second end and pump or within the pump itself. The intake line is preferably adapted to be stored within the container when the system is in a storage mode.