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Majority of potable water microplastics are smaller than the 20 µm EU methodology limit for consumable water quality
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Researchers analyzed microplastic content in potable water samples down to 1 micrometer in size, well below the 20-micrometer minimum specified by the EU's proposed methodology for drinking water quality testing. They found that the majority of microplastics detected were smaller than 20 micrometers, meaning current regulatory approaches would miss most of the contamination. The study raises concerns that the smallest particles, which are more likely to cross biological barriers, are not being captured by proposed monitoring standards.
Microplastic (MP) content in nutrition including potable water is unregulated, although MP concentrations in bottled water can diverge by several orders of magnitude. The EU Directive 2020/2184 on consumable water quality recently proposed methodological approaches to the detection of MPs in potable water in the size range of 20-5000 µm. However, small MPs in the 1-20 µm range are far more likely to pass the human intestine into blood and organs. We therefore investigated MP concentrations down to 1 µm in ten individual polyethylene terephthalate (PET) bottled water brands and one tap water sample by Raman microspectroscopy. Our analyses are supported by procedural blank- (negative control) and analytical recovery correction (positive control) using red polyethylene fragments in the 5-100 µm range. We find that MP concentrations range from 19 to 1,154 (n/L) [0.001 to 0.250 µg/L]. Importantly, 98 and 94% of MPs measured less than 20 and 10 µm in diameter, respectively, demonstrating the importance of small MP inclusion in potable water analyses and regulation.
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Majority of potable water microplastics are smaller than the 20 μm EU methodology limit for consumable water quality
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Researchers tested ten brands of bottled water and found that 98% of the microplastic particles were smaller than 20 micrometers, which is below the detection limit set by EU drinking water regulations. This means current testing methods miss the vast majority of microplastics in drinking water. The smallest particles are also the most concerning for health because they are more likely to pass through the gut lining and enter the bloodstream.
The Advanced EU Microplastics Drinking-Water Monitoring Framework and the Remaining Nanoplastics Gap
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The EU now tests drinking water for tiny plastic particles, but current methods can only detect particles down to 20 micrometers, missing smaller microplastics and even tinier "nanoplastics" that may be more likely to interact with our cells due to their small size and larger surface area relative to their mass. This review paper argues that as monitoring expands to rivers, lakes, and groundwater, we need better, more scalable testing tools to catch these smaller particles, since what we can't measure, we can't fully understand the health risks of.
Sub-sampling strategies for analysis of small (<20 µm) microplastics in water
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This study tested different methods for measuring very small microplastics (under 20 micrometers) in drinking water and found that analyzing too small a portion of a sample can lead to large errors when estimating total contamination. They determined that researchers need to analyze at least 6-8% of the total filter area to keep errors below 17%. Accurate measurement methods are critical because the smallest microplastics are the most abundant in drinking water and are the most likely to enter human tissues.
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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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