Lithium-ion batteries (LIBs) are key to modern energy storage due to their high energy density and rechargeability. LIB components contain fluorinated compounds, including ionic liquid anions such as hexafluorophosphate (PF6-), tetrafluoroborate (BF4-) and bis(trifluoromethanesulfonyl)imide (TFSI) in electrolytes. However, limited data exist on emissions and environmental behaviour of these substances across the LIB lifecycle. This screening study aimed to detect fluorinated substances linked to LIBs in water near three Swedish sites: a recycling facility (Stena Metall AB, Halmstad), an R&D center (Northvolt Labs, Västerås), and a landfill (Sofielund, Stockholm), as well as in wastewater treatment effluent from four cities and drinking water from two cities. The two inorganic fluorinated compounds, PF6- and BF4-, were measured at levels up to 39 000 ng/L and 2 400 ng/L, respectively, near the industrial site in Halmstad. Of the three bis-perfluoroalkyl sulfonimide (bisFASI) homologues analysed, TFSI was the most prevalent. Around the recycling facility, TFSI was measured at 33-82 ng/L, and at even higher concentrations downstream of the site in a nature reserve (106 ng/L). TFSI was present in the wastewater treatment plant effluents from all four cities, at concentrations ranging from 0.4 to 2.1 ng/L. Trifluoroacetic acid (TFA) was the dominant fluorinated substance across most samples, whereas other short-chain PFAS and inorganic ions, including BF4-, TFMS, PFPrS, PFBS, PFHxS (linear [L] and branched [br]), and TFSI, exhibited site-specific occurrence. These results demonstrate that LIB-associated fluorinated substances are present in the environment and at elevated concentrations around recycling and waste management sites. This screening study highlights the need for expanded monitoring and improved treatment strategies to minimize the emissions of these hazardous chemicals into the environment.