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The cation of the title salt, C 18 H 20 N 42+ ·2HSO 4− ·2H 2 O, lies on a center of inversion with the mid-point directly in the middle of the  p -phenyl­ene ring. Within the hydrogensulfate ion, the S—O(H) bond is the longest of the S—O bonds. The dihedral angle between the central and terminal ring of the cation is 78.6 (2)°. In the crystal, the cation, anion and water mol­ecule inter­act by O—H⋯O and N—H⋯O hydrogen bonds, generating a three-dimensional network.

2,2′-[p-Phenylenebis(methylideneazanediyl)]dipyridinium bis(hydrogensulfate) dihydrate