Abstract: The present invention relates to a mobile water purification system employing crossflow filtration, such as reverse osmosis filtration. One embodiment of the invention discloses a mobile water purification system comprising a housing, a pump unit and a piping system for providing fluid communication between a water inlet, a pre-filtration unit, a crossflow filtration unit, a disinfection unit and an outlet for supply of purified water, wherein the pre-filtration unit comprises sediment/cartridge filtrations means and dechlorination means, the cross-flow filtration unit comprises a plurality of parallel and/or sequentially arranged membrane filters, and the piping system is reconfigurable such that the crossflow filtration unit can be bypassed. The present water purification system is adapted to be deployed in remote areas substantially anywhere in the world.