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In the cation of the title compound, C6H6N5+·ClO4−·H2O, the pyridinium and tetrazole rings are essentially coplanar, making a dihedral angle of 1.2 (2)°. In the crystal, intermolecular N—H...O and O—H...O hydrogen bonds link the cations, anions and water molecules into a ribbon-like structure along the c axis. Adjacent ribbons are linked via π–π stacking interactions between the tetrazole rings, with a centroid–centroid distance of 3.484 (2) Å.