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In the title hydrated salt, CH6N3+·C4H5O6−·H2O, the deprotonated carboxyl group is disordered over two positions with a site-occupancy ratio of 0.945 (3):0.055 (3). The bond lengths in the guanidinium cation are intermediate between normal C—N and C=N bond lengths, indicating significant delocalization in this species. In the crystal structure, anions and water molecules are linked into sheets parallel to the ab plane by intermolecular O—H...O hydrogen bonds. The linking of the anions and water molecules with the cations by intermolecular N—H...O hydrogen bonds creates a three-dimensional network.