In this work water crossover between anode and cathode compartments of a PEM fuel cell was studied. A net water transport from cathode to anode under zero current was observed when the fuel cell was operated with saturated and oversaturated gases on anode and cathode, respectively. An additional pressure gradient of 0.5 bar from anode to cathode showed no significant influence on water crossover rate. The relevance of these observations to Schroder's Paradox as well as implications for the explanation of water crossover results in a running fuel cell are discussed. (C) 2012 Elsevier B.V. All rights reserved.