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Microplastic Release from Drinking Water Contact Materials: Material-Specific Responses to Chlorination and Implications for Consumer Exposure
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Lab tests measured microplastic particles released from six materials used in drinking water pipes and linings, with and without chlorine treatment. The type and amount of plastic released depended on the material, with two materials releasing the most particles and two releasing the least. Most particles were very small, between 20 and 100 micrometers in size.
Microplastics are increasingly recognized as contaminants of emerging concern in drinking water, highlighting the need to assess drinking-water-contact materials as potential sources of particle release. This study investigated microplastic migration from six materials commonly used in drinking water infrastructure under chlorinated and non-chlorinated conditions using three consecutive migration cycles. Particle abundance, polymer composition, and size distribution were determined by micro-Fourier transform infrared spectroscopy (μ-FTIR). Microplastic release was strongly dependent on material composition. Polyester-derived particles predominated in M1 and M2, polyethylene particles in M3 and M4, and PVC particles in M5, whereas the cementitious lining material (M6) exhibited the lowest release potential. Chlorination influenced particle release in a material-dependent manner, with M2 showing the highest concentrations under chlorinated conditions. Across all materials, most particles belonged to the 20-50 μm and 50-100 μm size classes. Consumer exposure was assessed using a Relative Microplastic Release Index (RMRI), identifying M2 and M5 as the major contributors to potential exposure and M4 and M6 as the most stable materials. Overall, the results demonstrate that material composition governs microplastic release and should be considered when evaluating drinking-water-contact materials and consumer exposure.
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Researchers studied how plastic water pipes in distribution systems leach micro- and nanoplastics into drinking water under varying conditions of pH, chlorine levels, and pipe material. They found that higher pH and the presence of free chlorine both contributed to increased particle release from the pipes. The findings raise concerns that everyday drinking water infrastructure may be an overlooked source of human microplastic exposure.
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Scientists tested different types of plastic pipes used in drinking water systems and found that some materials, especially one called polybutylene, shed more tiny plastic particles and dissolved organic matter into water than others, particularly under hot, chlorinated conditions similar to real-world plumbing. Pipes made of PVC performed more like stainless steel, releasing far fewer particles. This matters because it suggests the type of pipe in your home or building could affect how much microplastic ends up in your tap water, and it points to a practical way to reduce plastic exposure: choosing pipe materials more carefully.
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Researchers analyzed raw and treated water from three water treatment plants and found microplastics in all samples, though treatment reduced particle counts by roughly 70 to 80 percent. The vast majority of detected particles were smaller than 10 micrometers, a size range often missed by other studies. The findings highlight that while water treatment removes most microplastics, very small particles can still pass through conventional filtration systems.
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Researchers tracked microplastics through an entire drinking water system, from the source water to household taps, and found that treatment plants actually increased microplastic counts rather than removing them. The treated water contained 12 to 25 particles per liter, with most being tiny fragments under 100 micrometers made of common plastics like PET and PVC. This suggests that current water treatment infrastructure may be shedding microplastics from its own pipes and filters into the water people drink.
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