San Francisco Water Board Releases Updated Environmental Screening Levels
The San Francisco Regional Water Quality Control Board (SFRWQCB) released updated Environmental Screening Levels (ESLs) dated July 18, 2025. This is the first update to the ESLs since 2019 and notably includes soil and groundwater ESLs for 14 new PFAS chemicals as well as updated soil and groundwater cancer risk ESLs for PFOA and PFOS. The newly updated ESLs for PFOA are even more conservative than the interim soil screening levels released by the SFRWQCB in May 2020, with some…