In the zwitterionic molecule of the title compound, C10H7N3O4·H2O, one carboxyl group is deprotonated and the pyridine N atom is protonated. The pyridinium and imidazole rings form a dihedral angle of 5.23 (1)°. An intramolecular O—H⋯O hydrogen bond occurs. In the crystal, intermolecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds link the zwitterions and water molecules into sheets parallel to (102)
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