This document describes the design and working of a pneumatic reciprocating water pumping system. The system uses a pneumatic cylinder powered by compressed air to pump water with minimal electric power. It consists of a water tank, pneumatic cylinder, solenoid valve and control unit. When the solenoid valve is actuated, the pneumatic cylinder extends and retracts, causing the coupled pumping cylinder to do the same. This sucks water in on the retract stroke and delivers it on the extend stroke, continuously pumping water as needed with little manual effort or electric power required.