In the title compound, C(16)H(14)Cl(2)N(2)O(4)·H(2)O, the hydrazine and water mol-ecules are both located on twofold axes. The C-N-N-C torsion angle is -72.66 (1)° and the dihedral angle between the two benzene rings is 67.33 (1)°. In the crystal, mol-ecules are linked into a layer structure by a combination of O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds. Adjacent layers are linked into a three-dimensional network by Cl⋯Cl inter-actions [3.400 (2) Å]. C-H⋯π inter-actions are also observed.
