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In the title salt, C 8 H 16 N 2 O 42+ ·2H 2 PO 4− ·2H 2 O, the piperazine ring is located around an inversion center and adopts a chair conformation. The dihydrogen phosphate anions and free water mol­ecules are linked  via  O—H⋯O hydrogen bonds into two-dimensional hydrogen-bonding layers, which are further connected through O—H⋯O and N—H⋯O hydrogen bonds involving the protonated piperazine into a three-dimensional supra­molecular network.

1,4-Bis(carboxymethyl)piperazine-1,4-diium bis(dihydrogen phosphate) dihydrate