This dataset package includes Python scripts, outputs (figures, model results), and associated documentation used in the publication "Exploring online sensor parameters as proxies for polar organic chemicals – An innovative approach for combined sewer overflow monitoring." The raw data utilized for these analyses is sourced from https://doi.org/10.25678/000D3C and https://doi.org/10.25678/000DNY. This package provides all necessary resources to reproduce the results presented in the study.