Data presenting the environmental occurrence of ultra-short-chain perfluoroalkyl acids (PFAAs) is scarce and little is known about potential sources. In this study, ultra-short-chain PFAAs were analyzed in water connected to potential point sources using supercritical fluid chromatography coupled to tandem mass spectrometry. Samples (n=34) were collected in connection to firefighting training sites, landfills and a hazardous waste management facility. Ultra-short-chain PFAAs were detected in all samples at concentrations up to 84 000 ng/L (∑C1-C3), representing up to 69% of the concentration of 29 per- and polyfluoroalkyl substances (PFASs). Trifluoroacetic acid (TFA), perfluoropropanoic acid (PFPrA), trifluoromethane sulfonic acid (TFMS), perfluoroethane sulfonic acid (PFEtS), and perfluoropropane sulfonic acid (PFPrS) were detected at concentrations up to 14 000 ng/L, 53 000 ng/L, 940 ng/L, 1 700 ng/L and 15 000 ng/L, respectively. Principal component analysis suggest that TFA is associated with landfills. PFPrS was associated with samples collected close to the source at all types of sites included in this study. These findings reveal the presence of high concentrations of ultra-short-chain PFAAs released into the environment from various sources and emphasizes the large fraction of ultra-short-chain PFAAs to the total concentration of PFASs in water.