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The title compound, C17H16ClN3O2·H2O, an acylhydrazone derivative, contains a glycine moiety and two substituted benzene rings on either end of the chain. It crystallized as a monohydrate. The molecules adopt an E conformation with respect to the C=N double bond, as indicated by the N—N=C—C torsion angle of 179.38 (14)°. The molecule is twisted in such a way that the almost planar Car—C(=O)—N(H)—C(H2) and C(H2)—C(=O)N(H)—N=C—Car [r.m.s deviations = 0.009 and 0.025 Å, respectively] segments are inclined to on another by 77.36 (8)°, while the benzene rings are normal to one another, making a dihedral angle of 89.69 (9)°. In the crystal, the water molecule links three molecules through two O—H...O and one N—H...O hydrogen bonds. The molecules are linked via pairs of N—H...O hydrogen bonds, forming inversion dimers with an R22(14) ring motif. The dimers are linked by O—H...O hydrogen bonds, involving two molecules of water, forming chains along [100], enclosing R22(14) and R22(18) ring motifs. The chains are linked through C—H...O interactions, forming sheets parallel to (010). Within the sheets, there are C—H...π and parallel slipped π–π stacking interactions present [inter-centroid distance = 3.6458 (12) Å].