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Co-crystallization of 4,4′-methylenediphenylamine (MDA) and 5-sulfosalicylic acid (5-H2SSA) yields the title salt, C13H16N22+·2C7H5O6S−·H2O. The asymmetric unit is comprised of one dication, two anions and one water molecule. In the crystal structure, the components of the salt are linked by a combination of intermolecular O—H...O, N—H...O and weak C—H...O hydrogen bonds into a three-dimensional framework. In addition, two weak π–π interactions [with centroid–centroid distances of 3.8734 (15) and 3.7465 (15) Å] and one C—H...π interaction further stabilize the crystal structure.