Mahony, Anna KMcNamara, Patrick JArnold, William A2024-01-082024-01-082024-01-08https://hdl.handle.net/11299/259794The data in this file are the concentrations of quaternary ammonium compound (QAC) disinfectants in wastewater influent and effluent from four wastewater treatment plants from May 2020 to January 2022. Influent is untreated water that enters the plant. Effluent is treated water that enters the environment.The dataset contains the concentrations of quaternary ammonium compounds detected in influent and effluent wastewater, as well as absolute recoveries of QACs spiked into influents and effluents, and absolute recoveries of isotopically labeled surrogate standards, spiked into all samples. After extraction from wastewater, samples are analyzed on a liquid chromatography tandem mass spectrometry (LC-MS/MS), specifically a triple quadrupole mass spec. Raw data from this instrument is provided as well, in the "Raw QQQ data" tab.CC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/quaternary ammonium compoundsQACsdisinfectantsCOVID-19influenteffluentpandemicwastewaterDatasethttps://doi.org/10.13020/a1c6-zf93