Abstract: A household appliance water leak detection and management containment wall made from one or more oblong pieces of water-resistant, shape-retaining, flexible sheet material such as aluminum. The ends of the pieces may be joined to circumscribe a zone of contact between the appliance and its supporting surface, forming a containment space. A layer of sealant creates a water-resistant seal between a lower edge of the wall and the supporting surface. An electronic water-detection and alarm device may be placed within the containment space. A valved spigot may be mounted through a portion of the wall to allow drainage.