The data presented in this data file is a product of a journal publication. The dataset contains the concentrations of FTOHs measured along with the statistic analysis results derived from the data. This dataset is associated with the following publication: Eichler, C., H. Calder, B. Chandramouli, M. Curtis, H. Hayes, B. Kim, R. Marfil-Vega, C. Mejías, L. Miles, A. Owens, J. Stuff, K. Thaxton, J. Vandenberg, N. Watson, D. Wevill, J. Whitecavage, and X. Liu. Measuring fluorotelomer alcohols by thermal desorption-gas chromatography-tandem mass spectrometry: Interlaboratory study results. JOURNAL OF CHROMATOGRAPHY A. Elsevier Science Ltd, New York, NY, USA, 1769: 466725, (2026).