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In the title compound, [Cu2Mn(C5HN2O4)2(H2O)6]n, the CuII ion is coordinated by two N atoms, two O atoms and one water O atom in a distorted square-pyramidal geometry. The MnII ion is coordinated by two O atoms and four water O atoms in a distorted octahedral geometry. Two pyrazolyl-3,5-dicarboxylate anions chelate to two copper ions, forming a dinuclear unit, which further connects the MnII ions into chains extending along [100]. Both independent coordinated water molecules on the MnII ion are disordered in a 50:50 fashion.

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.