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The asymmetric unit of the title compound, C4H12N22+·2C5H3N2O4−·4H2O, comprises one-half of a piperazine-1,4-diium cation, which lies on an inversion centre, a 2-carboxy-1H-pyrazole-4-carboxylate anion and two water molecules. An extensive network of intermolecular O—H...O, N—H...O, N—H...N and C—H...O hydrogen bonds between the cations, anions and water molecules leads to a three-dimensional supramolecular framework.