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SPOT program: PFAS detected widely at urban tier‑2 sites, but trends need more years of data
Summary
UC Davis researchers updating the SPOT monitoring program reported frequent detections of PFOS, PFOA and longer‑chain PFAS at urban tier‑2 sediment sites in the 2023–2024 dataset, but said two more years of comparable data are needed before formal trend analysis.
UC Davis researchers updating the SPOT monitoring program reported that PFAS compounds were frequently detected at the program’s urban (tier 2) sites in the 2023–2024 paired dataset, and that some sites show complex PFAS fingerprints warranting follow‑up.
"PFOS ... was detected at 36 out of 40 sites," Bushra Khan said when summarizing the 2023–2024 PFAS sediment results measured using EPA Method 1633‑type analyses. She added that PFOA and longer‑chain carboxylates (C10–C14) were also common at urban sites.
Why it matters: PFAS are persistent and bioaccumulative. SPOT staff emphasized that two years of high‑quality data…
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