An apparatus and method for detecting moisture in a diaper is disclosed. A moisture sensor apparatus is comprised of a housing made of material dimensionally-sensitive to moisture, such that the housing will expand or contract. Electrically conductive contacts disposed on/in the housing, are selectively coupled to, or decoupled from, each other based on a dimensional change of the sensor device when it comes into contact with moisture. An electrical signal routable through the electrically conductive contacts detects a change in state, e.g., from open to closed, and activates a local or remote alarm to indicate the presence of moisture. The consumable low-cost sensor and the optional non-metallic leads and contacts, that are at least partially biodegradable, are coupled via a convenient slidable brush connector to a resusable alarm system having optional low duty cycle transmitting capability to a receiver base station, thereby providing a cost-effective, eco-friendly and user-friendly system.
