By Priyanjana Pramanik, MSc. Reviewed by Susha Cheriyedath, M.Sc. Nov 2 2025 A new California study reveals that “safe” levels of PFAS in tap water may still lead to elevated toxic chemicals in the bloodstream, raising new concerns about everyday exposure and regulatory limits. Study: Associations between PFAS in public water system drinking water and serum among Southern California adults . Image Credit: Megane Ad / Shutterstock In a recent article in the  Journal of Exposure Science &