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The asymmetric unit of the title salt, C4H12N22+·2C7H4NO4− or pipzH22+·2(py-2,3-dcH−), prepared by a reaction between pyridine-2,3-dicarboxylic acid (py-2,3-dcH2) and piperazine (pipz), contains a monoanion and half of a centrosymmetric dication. The anionic fragment individually has two intramolecular hydrogen bonds, an almost linear O—H...O bond between two carboxylate groups and a C—H...O bond between the aromatic ring and carboxylate group. Other O—H...O, N—H...O and C—H...O hydrogen bonds are responsible for three-dimensional expansion of the structure.