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In the title inner salt, C 16 H 20 N 2 O 8 ·H 2 O, two of four carboxyl groups are deprotonated, while the two imine groups are protonated. The two imino­diacetate groups are located on the same side of the benzene ring plane. Extensive inter­molecular O—H⋯O and N—H⋯O hydrogen bonds occur in the crystal.

N,N′-Dicarboxy-N,N′-dicarboxylato(m-phenylene)dimethanaminium monohydrate