The results demonstrate the Ag 3d5/2-3/2 spectrum of the pristine AgNPs. Furthermore, the XAS spectra from the analysis of the nanosilver solution (ASAP-AGX-32) after the disinfection process is demonstrated followed by the LCF results indicating the dominant species formed after the disinfection process. This dataset is associated with the following publication: Gitipour, A., S. Al-Abed, S. Thiel, K. Scheckel, and T. Tolaymat. Nanosilver as a disinfectant in dental unit waterlines: Assessment of the physiochemical transformations of the AgNPs. Jacob de Boer and Shane Snyder CHEMOSPHERE. Elsevier Science Ltd, New York, NY, USA, 173: 245-252, (2017).