The present analysis shows the local distribution of current density and EIS measurements along the channel coordinate of a single-channel proton-exchange membrane water electrolysis cell. Measurements for operating modes with one sufficiently high and one insufficiently low stoichiometric water ratio were carried out, in order to observe effects on the current density distribution. Furthermore, global and local EIS measurements were performed to distinguish between the voltage loss differences in the two cases. The local analysis has shown that the level of membrane and catalyst hydration under low stoichiometric conditions can be distributed highly inhomogeneous in the longitudinal direction, with the most pronounced dehydration towards the end of the channel.