Abstract: A decontamination unit (10) is provided including an upright collapsible frame (12) and a one-piece integrated enclosure (14). The frame (12) includes extensible legs (16) interconnected by upper scissor linkages (20); it may be manually erected in the field in a very few minutes. The enclosure (14) is suspended on and supported by the frame (12) and preferably includes a lower basin floor (30) and upright wall structure (40). One or more ingress/egress passageways (70) are provided in the wall structure (40). The unit (10) may be used individually or a plurality thereof may be positioned juxtaposition for staged decontamination purposes.