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The structure of the title compound, (C6H7N2O)6[V10O28]·2H2O, at 120 (2) K has monoclinic (C2/c) symmetry. The asymmetric unit consists of one half-deca­vanadate anion of Ci symmetry, three cations and one water mol­ecule. Each water mol­ecule is hydrogen bonded to two deca­vanadate anions, thus forming a one-dimensional chain of anions. The three-dimensional supra­molecular structure is formed by a network of N—H...O, O—H...O and C—H...O hydrogen bonds, in which the cations, anions and water mol­ecules are involved, and by nonparallel-displaced π-stacking inter­actions between pyridine rings. As a result of hydrogen bonding, the carboxamide groups of the cations are somewhat twisted from the pyridine ring plane.
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