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The asymmetric unit of the title monohydrated salt, 2C26H28F2N22+·4Cl−.H2O, consists of a 1-[bis(4-fluorophenyl)methyl]-4-[(2Z)-3-phenylprop-2-en-1-yl]piperazine-1,4-diium cation with a diprotonated piperizine ring in close proximity to two chloride anions and a single water molecule that lies on a twofold rotation axis. In the cation, the piperazine ring adopts a slightly distorted chair conformation. The dihedral angles between the phenyl ring and the 4-fluorophenyl rings are 89.3 (9) and 35.0 (5)°. The two fluorophenyl rings are inclined at 65.0 (5)° to one another. In the crystal, N—H...Cl hydrogen bonds and weak C—H...Cl intermolecular interactions link the molecules into chains along [010]. In addition, weak C—H...O interactions between the piperizine and prop-2-en-1-yl groups with the water molecule, along with weak C—H...Cl interactions between the prop-2en-1-yl and methyl groups with the chloride ions, weak C—H...F interactions between the two fluorophenyl groups and weak O—H...Cl interactions between the water molecule and chloride ions form a three-dimensional supramolecular network.