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The title compound, 2C4H12N22+·C10H2O84−·6H2O or (pipzH2)2(btc)·6H2O, was formed from the reaction between benzene-1,2,4,5-tetracarboxylic acid (btcH4) as a proton donor and piperazine (pipz) as a proton acceptor. A variety of O—H...O, N—H...O and C—H...O hydrogen bonds, as well as C—H...π interactions, are present in the crystal structure. Two water O atoms are each disordered over two positions; for both the site occupany factors are ca 0.66 and 0.34.