Morpholin-4-ium 4-meth-oxy-benzoate 4-meth-oxy-benzoic acid monohydrate.

In the crystal structure of the title compound, C4H10NO+·C8H7O3−·C8H8O3·H2O, cations, anions and neutral mol­ecules are linked by inter­molecular N—H⋯O and O—H⋯O hydrogen bonds into chains running parallel to the c axis. The –CO2 groups make dihedral angles of 4.6 (3) and 5.7 (4)° with the attached ring in the 4-methoxybenzoic acid molecule and the 4-methoxybenzoate anion, respectively.