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Unveiling Chemical-Microbial Cascade Risk Factors from Plastic Pipe Leaching in Drinking Water
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Researchers found that plastic drinking water pipes continuously leach dissolved organic compounds — including bisphenols and organophosphate esters — that reshape microbial communities in ways that promote antibiotic resistance genes, opportunistic pathogens, and virulence factors, with polyethylene posing the highest chemical risk and PVC supporting the greatest pathogen abundance.
Plastic pipes are increasingly used in drinking water distribution systems, yet their impact on water quality remains insufficiently understood. Here, we systematically investigate the dual outcomes posed by plastic pipes─chemical leaching and cascaded microbial exposure risks─by integrating Fourier Transform Ion Cyclotron Resonance Mass Spectrometry and metagenomic analysis. Our results reveal that plastic pipes continuously release dissolved organic matter (DOM), including organic additives such as bisphenols (BPs) and organophosphate esters (OPEs), which profoundly reshape microbial communities. Under chlorinated conditions, leached DOM alters microbial diversity, promoting chlorine-resistant bacteria and opportunistic pathogens (OPs), while under nonchlorinated conditions, it accelerates microbial growth and enriches antibiotic resistance genes (ARGs), OPs, and virulence factors (VFs). Among plastic materials, polyethylene (PE) exhibited the highest chemical risk, releasing high concentrations of TCPP (700 ng/L) and BPF (200 ng/L) along with 207-227 unique DOM molecules. In contrast, polyvinyl chloride (PVC) supported the highest OP abundance, while polypropylene random copolymer (PPR) fostered the greatest OP diversity. These findings challenge conventional drinking water safety assessments that separate chemical contamination from microbial risk, underscoring the urgent need for an integrated risk assessment framework. Furthermore, they highlight the necessity of paying greater attention to the chemical and cascading microbial issues arising from the leaching of plastic pipes into drinking water, and of conducting a more comprehensive assessment of the associated potential health risks.
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Microplastics and chemical leachates from plastic pipes are associated with increased virulence and antimicrobial resistance potential of drinking water microbial communities
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Researchers found that microplastics and chemical leachates released from polypropylene drinking water pipes can promote antimicrobial resistance and virulence in the microbial communities that form inside the pipes. Exposure to chlorination, heating, and freeze-thaw cycles accelerated microplastic generation and chemical leaching from the pipes. The findings suggest that plastic plumbing materials may be an underappreciated factor in drinking water safety.
Biofilm induced microplastics and microbial metabolites release from Polypropylene Random pipes in drinking water distribution systems
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Researchers investigated how biofilm colonisation of polypropylene random copolymer (PPR) pipes used in drinking water distribution systems drives surface deterioration and releases microplastics and microbial metabolites into water, using SEM, flow cytometry with 16S rRNA sequencing, and GC-MS analysis. They found that biofilm formation progressively roughened pipe surfaces through microbial colonisation, with biofilm-induced corrosion generating MPs and secondary metabolites that pose water safety risks under long-term deployment conditions.
Exploring the co-occurrence of microplastics, DOM and DBPs inside PVC pipes undergoing chlorination by correlation analysis and unsupervised learning
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Researchers exposed PVC drinking water pipes to different chlorine concentrations in a laboratory setup and tracked the co-release of dissolved organic matter, microplastics, and disinfection by-products (DBPs). At higher chlorine doses, both PVC-derived MPs and DOM were released and correlated with DBP formation, while at 1 ppm chlorine, natural organic matter dominated—identifying disinfection as a driver of in-pipe MP generation.
The Behavior of Polymeric Pipes in Drinking Water Distribution System—Comparison with Other Pipe Materials
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This review examines how polymeric water pipes release chemical compounds into drinking water, including heavy metals from pipe materials and microbial biofilms, and compares risks across different pipe materials. Leaching from pipe materials poses ongoing risks to drinking water quality in distribution systems.
Chemical and microbiological safety of drinking water in distribution networks made of plastic pipes
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Researchers examined the safety of drinking water distributed through plastic pipes made of PVC and HDPE, which are increasingly replacing metal pipes. They found that these plastic pipes can leach chemical compounds into the water and may promote different microbial growth patterns compared to metal pipes. The study highlights the need for better monitoring of both chemical and microbiological quality in drinking water systems that use plastic infrastructure.
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