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In the title compound, 2C5H8N3+·C4H4O62−·H2O, the two cations are essentially planar [maximum deviations = 0.023 (1) and 0.026 (1) Å]. In one of the cations, the protonated N atom and one of the amino group H atoms are hydrogen bonded to one of the carboxyl groups of the dianion through a pair of N—H...O hydrogen bonds, forming an R22(8) ring motif. In the crystal structure, the tartrate anions and water molecules are linked into chains along the c axis by intermolecular O—H...O and C—H...O hydrogen bonds. The cations further link the anions and water molecules into a three-dimensional extended structure by a network of N—H...O hydrogen bonds. The crystal structure is also stabilized by weak intermolecular π–π interactions [centroid–centroid distance = 3.6950 (6) Å].