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Samples are taken at the entry point to the distribution system, not at the tap; the system may have changed sources or installed treatment since. Treatment reported to EPA for PFAS: ion exchange (IEX), no PFAS treatment (NMT). 7 entry points sampled, 18 sampling events between 2024-01-19 and 2024-10-08. The page's PFAS values come from the newest sample at Stony Brook Plant (25077/TP025077), the entry point with the highest PFOA + PFOS + PFNA + PFHxS sum; the other entry points' maxima are listed as separate rows. Non-detects are shown as \"<\" followed by EPA's minimum reporting level (3 to 20 ng/L); PFAS-4 sums quantified compounds only, so it is a lower bound when a compound was not detected. 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