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The title compound, {(C4H12N2)[Bi2(C7H3NO4)4(H2O)]·H2O}n or {(pipzH2)[Bi2(pydc)4(H2O)]·H2O}n, where pydcH2 is pyridine-2,6-dicarboxylic acid and pipz is piperazine, was obtained by reaction of Bi(NO3)3·5H2O with (pipzH2)(pydcH)2·3H2O in a 1:2 molar ratio in aqueous solution. There are two independent BiIII atoms in the structure, one of which is eight-coordinate with a distorted bicapped trigonal-prismatic geometry, and another which is nine-coordinate with a distorted tricapped trigonal-prismatic geometry. The carboxylate groups of the (pydc)2− ligands link dinuclear [Bi2(C7H3NO4)4(H2O)]2− units into one-dimensional coordination polymers. The pipzH22+ cations (site symmetry overline{1}) and non-coordinated water molecules lie between these polymers, forming N—H...O and O—H...O hydrogen bonds to the O atoms of the carboxylate groups.