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No experimental data investigating the hydrolysis of sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) are available. This substance is highly soluble (water solubility 335 g/L) and it rapidly dissociates in water, being 2,4-dichlorophenoxyacetic acid (CAS No. 94-75-7) its main product. Therefore, a conclusion on this endpoint was drawn based on the hydrolysis of 2,4-dichlorophenoxyacetic acid. The hydrolysis of 2,4-dichlorophenoxyacetic acid was tested in a preliminary study conducted according to OECD Guideline No. 111, Hydrolysis as a function of pH (2004), under GLP conditions. The percentage of test material hydrolyzed after 5 days was below 10% at pH 1.2 (37°C), 5, 7 and 9 (50°C) and therefore, it can be considered as hydrolytically stable and no further testing is required.