Abstract: A water bagging system (1) comprising a trailer-mounted weatherproof enclosure (10) containing a compartmentalized automatic bag filling machine (40) feeding in a string of pre-manufactured water bags out of their carton, a pump/compressor assembly (4) for pumping potable water in from an external potable source such as a TWPS, water tank or hydrant, a filtration and sterilization assembly for filtering and sterilizing the water by a combination of mechanical, carbon, UV and a filling machine sanitization system consisting of a water ozonator (48) and an air ozonator (44). The system is hardened against the harshest environments by a surrounding tent enclosure (2), and a filtered air supply (5) that over-pressures the system (1) to keep dust and sand out. The system (1) is capable of producing a high-volume of water bags within a range of commercial and specialty sizes, and the water remains stable for prolonged periods without bacterial growth and degradation of taste and odor.