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In the title compound, C9H10N2O3·H2O, the Schiff base molecule is approximately planar, the dihedral angle between the benzene and acetohydrazide planes being 5.40 (7)°. An intramolecular O—H...O hydrogen bond is observed. In the crystal, molecules are linked into a two-dimensional network parallel to (100) by O—H...O, N—H...O, O—H...N and C—H...O hydrogen bonds, and by π–π interactions between symmetry-related benzene rings [centroid–centroid distance = 3.543 (2) Å].