SF water has no PFAs [2]. Bay Area groundwater has lithium. San Jose groundwater had 2 ppb lithium in 1964 [5]. Santa Clara groundwater now has 5-10 ppb lith

SF water has no PFAs [2]. Bay Area groundwater has lithium. San Jose groundwater had 2 ppb lithium in 1964 [5]. Santa Clara groundwater now has 5-10 ppb lithium [4]. SF has several aquifers. In 2017, SFPUC started using 4 mgd (million gallons per day) of groundwater from these aquifers [0]. SFPUC delivers 60 mgd to SF retail customers [1], so groundwater comprises 10% and the remaining 90% comes from Hetch Hetchy via pipeline [3]. I found no direct measurement of Lithium in Hetch Hetchy water. SF fills its reservoirs with Hetch Hetchy water [6]. These reservoirs had about 1 ppb of lithium in 1965 [5]. I expect Hetch Hetchy's lithium levels are unchanged. TLDR: SF water has 1 ppb (1 ng/mL) lithium and no PFAs. [0] https://www.sfpuc.org/programs/water-supply/groundwater https://www.sfpuc.org/programs/water-supply/groundwater [1] https://sfwater.org/Modules/ShowDocument.aspx?documentid=14560 https://sfwater.org/Modules/ShowDocument.aspx?documentid=145... [2] https://sfpuc.org/sites/default/files/accounts-and-services/water-quality/20210525-SF_WaterQualityReport.pdf https://sfpuc.org/sites/default/files/accounts-and-services/... [3] https://www.sfpuc.org/sites/default/files/about-us/watersupplymap_092118.pdf https://www.sfpuc.org/sites/default/files/about-us/watersupp... [4] https://www.valleywater.org/sites/default/files/2018-08/2017%20Groundwater%20Quality%20Report_Web.pdf https://www.valleywater.org/sites/default/files/2018-08/2017... [5] https://pubs.usgs.gov/wsp/1812/report.pdf https://pubs.usgs.gov/wsp/1812/report.pdf [6] https://en.wikipedia.org/wiki/Hetch_Hetchy https://en.wikipedia.org/wiki/Hetch_Hetchy