The World Health Organization (WHO) has announced a review into the potential risks of plastic in drinking water after a new analysis of some of the world’s most popular bottled water brands found that more than 90% contained tiny pieces of plastic.
A previous study also found high levels of microplastics in tap water.
In the new study, analysis of 259 bottles from 19 locations in nine countries across 11 different brands found an average of 325 plastic particles for every liter of water being sold.
In one bottle of Nestlé Pure Life, concentrations were as high as 10,000 plastic pieces per liter of water. Of the 259 bottles tested, only 17 were free of plastics, according to the study.
Scientists based at the State University of New York in Fredonia were commissioned by journalism project Orb Media to analyze the bottled water.
The scientists wrote they had “found roughly twice as many plastic particles within bottled water” compared with their previous study of tap water, reported by the Guardian.
According to the new study, the most common type of plastic fragment found was polypropylene; the same type of plastic used to make bottle caps. The bottles analyzed were bought in the US, China, Brazil, India, Indonesia, Mexico, Lebanon, Kenya, and Thailand.
Scientists used Nile red dye to fluoresce particles in the water, the dye tends to stick to the surface of plastics but not most natural materials.
The study has not been published in a journal and has not been through scientific peer review. Dr. Andrew Mayes, a University of East Anglia scientist who developed the Nile red technique, told Orb Media he was “satisfied that it has been applied carefully and appropriately, in a way that I would have done it in my lab”.
The brands tested were:
- Aqua (Danone)
- Aquafina (PepsiCo)
- Bisleri (Bisleri International)
- Dasani (Coca-Cola)
- Epura (PepsiCo)
- Evian (Danone)
- Gerolsteiner (Gerolsteiner Brunnen)
- Minalba (Grupo Edson Queiroz)
- Nestlé Pure Life (Nestlé)
- San Pellegrino (Nestlé)
- Wahaha (Hangzhou Wahaha Group)
The spokesman said the WHO would “review the very scarce available evidence with the objective of identifying evidence gaps, and establishing a research agenda to inform a more thorough risk assessment.”
A second unrelated analysis, also just released, was commissioned by campaign group Story of Stuff and examined 19 consumer bottled water brands in the US. It also found plastic microfibres were widespread.
The brand Boxed Water contained an average of 58.6 plastic fibers per liter. Ozarka and Ice Mountain, both owned by Nestlé, had concentrations at 15 and 11 pieces per liter, respectively. Fiji Water had 12 plastic fibers per liter.
Nestlé criticised the methodology of the Orb Media study, claiming in a statement to CBC that the technique using Nile red dye could “generate false positives”.
Coca-Cola told the BBC it had strict filtration methods, but acknowledged the ubiquity of plastics in the environment meant plastic fibers “may be found at minute levels even in highly treated products”.
A Gerolsteiner spokesperson said the company, too, could not rule out plastics getting into bottled water from airborne sources or from packing processes. The spokesperson said concentrations of plastics in water from their own analyses were lower than those allowed in pharmaceutical products.
Danone claimed the Orb Media study used a methodology that was “unclear”. The American Beverage Association said it “stood by the safety” of its bottled water, adding that the science around microplastics was only just emerging.
While further research is required to fully understand the depth of such contamination, it is safe to say that bottled water is just as dangerous as our everyday tap water.