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In the title compound, (C 10 H 9 N 2 )[Fe(C 7 H 3 NO 4 ) 2 ]·4H 2 O or (bpyH)[Fe(pydc) 2 ]·4H 2 O, the asymmetric unit contains an [Fe(pydc) 2 ] −  (pydcH 2 = pyridine-2,6-dicarboxylic acid) anion, a protonated 4,4′-bipyridine as a counter-ion, (bpyH) + , and four uncoordinated water mol­ecules. The anion is a six-coordinate complex with a distorted octa­hedral geometry around the Fe III  atom. A wide range of non-covalent inter­actions,  i.e.  O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, ion pairing, C—O⋯π [3.431 (2) Å] and C—H⋯π stacking inter­actions result in the formation of a three-dimensional network structure.

4-(4-Pyridyl)pyridinium bis(pyridine-2,6-dicarboxylato)ferrate(III) tetrahydrate