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The title compound, C14H13N3O3·H2O, was prepared by the reaction of 4-methoxysalicylaldehyde and isonicotinohydrazide in ethanol. The Schiff base molecule is not planar and has an E configuration with respect to the methylidene unit. The dihedral angle between the benzene and pyridine rings is 36.8 (2)°. In the molecule there is an intramolecular O—H...N hydrogen bond involving the hydroxyl substituent and the N atom of the 2-hydroxy-4-methoxybenzylidene unit. In the crystal, the molecules are linked through intermolecular O—H...O, O—H...N and N—H...O hydrogen bonds, forming layers parallel to the bc plane.