Evaluating DBP Formation in Chlorinated Drinking Water: Effects of Contact with System Materials

Climate-driven challenges probably increase disinfection in drinking water systems. Interactions between disinfectants and infrastructure materials remain understudied. This study quantifies the consumption of chlorine, the release of dissolved organic carbon (DOC), and the formation of regulated disinfection byproducts (DBPs) from 20 common materials: polymeric pipes, seals, fittings, epoxy resins, and cement mortar. The materials were pulverized to maximize the surface area and create a worst-case scenario. The results were compared with standardized migration tests. Chlorine depletion (>90%) was observed in the waters exposed to epoxy resins, seals, and cement. The formation of DBP, especially trichloromethane (TCM), exceeded 100 μg/L in samples of epoxy resins, cement, vulcanized fiber, and polyamide; TCM was detected in polyethylene pipe materials at concentrations between 5 and 18 μg/L. Increased temperatures enhanced DOC leaching and THM formation. Relations between DOC and DBP concentrations indicate material leachates as precursors. The results highlight the importance of material selection and testing for disinfected drinking water systems, providing critical insights for risk assessment, material certification, and regulatory development.