Individual ions and the solvating water molecule constituting the structure of the title compound, [Fe(C8H13N)(C17H14P)]Cl.H2O, assemble into dimeric units located around crystallographic inversion centers via N-H...Cl and O-H...Cl hydrogen bonds. These discrete fragments are further interconnected into chains by C-H...O interactions.
The disubstituted ferrocene core in the {[1'-(diphenylphosphino)ferrocenyl]methyl}dimethylammonium cation has an approximate synclinal eclipsed conformation and is tilted by 3.40 (11) deg.