Colourless　crystals　of　the　title　compound,　C2H10N22+　center　dot　2C(10)H(5)O(8)(-)　center　dot　2H(2)O,　were　isolated　from　an　aqueous　solution.　The　basic　structural　unit　consists　of　two　trihydrogen　1,2,4,5benzenetetracarboxylate　(H(3)btec(-))　anions,　an　ethylenediammonium　cation　and　two　solvent　water　molecules.　The　ethylenediammonium　cation　is　centrosymmetric.　The　anion　has　a　short　intramolecular　hydrogen　bond　of　2.427　(4)　angstrom　involving　a　deprotonated　carboxylate　group　as　acceptor.　A　three-dimensional　hydrogen-bonding　network　defines　the　crystal　packing,　and　solvent　water　molecules　and　the　cations　occupy　voids　in　the　crystal　structure.