The Excel® spreadsheets below are submitted in support of data published in the manuscript, Yu, S., Garrabrants, A.C., DeLapp, R.C., Hubner, T., Thorneloe, S.A., and Kosson, D.S., Evaluation of testing approaches for constituent leaching from electric arc furnace (EAF) slags. Journal of Environmental Management 373, 123892, 2025. The following spreadsheets document the final preparation of data for publication in manuscript figures and supplemental materials. • LXS-ANCCap_Pueblo_EAF Titration_Final • LXS-GM_Pueblo_Single Batch (12-Oct-2023) FINAL for MANUSCRIPT • LXS-GM_Pueblo_EAF Slag Fraction Analysis (27-Sp-2023). This dataset is associated with the following publication: Yu, S., A.C. Garrabrants, R.C. DeLapp, T. Hubner, S.A. Thorneloe-Howard, and D.S. Kosson. Evaluation and Testing Approaches for Constituent Leaching from Electric Arc Furnace (EAF) Slags. JOURNAL OF ENVIRONMENTAL MANAGEMENT. Elsevier Science Ltd, New York, NY, USA, 373: 123892, (2025).