Quick answer: No single brand has been crowned the worst bottled water. The most widely cited research on the subject found microplastic particles in bottled water across major brands, including Aquafina, Dasani, Evian, Nestle Pure, San Pellegrino, and Gerolsteiner, at an average of 325 particles per liter, roughly twice the level found in tap water. Results vary by lot and by year, so treat any ranking as a snapshot and check current test reports.
What the bottled water study found
Bottled water is marketed on purity, and that reputation is the main reason people pay for it. A study published in Frontiers in Chemistry, titled "Synthetic Polymer Contamination in Bottled Water," put that reputation to the test by analyzing popular bottled water brands for microscopic plastic particles. It found them in the large majority of bottles tested.
Microplastics are fragments of plastic less than 5 millimeters long. Because of their tiny size, they can pass through conventional water treatment, so they show up in both tap and bottled water. The surprise in this study was the direction of the gap: the bottled water tested contained nearly twice as many microplastic particles as tap water.
Which brands were tested
The researchers analyzed popular bottled water brands sold in several countries, including Aquafina, Dasani, Evian, Nestle Pure, San Pellegrino, and Gerolsteiner. On average, the bottled water tested contained 325 microplastic particles per liter.
To be fair to every brand named here: this was an industry-wide finding, not a problem unique to any one label. Particle counts varied widely from brand to brand and even from bottle to bottle within the same brand, and a bottle bought today may test differently than one tested when the study was run. Results vary by lot and year, so check current test reports before drawing conclusions about any specific brand.
Where the plastic comes from
The particles identified included polypropylene, the plastic used to make bottle caps, and polyethylene terephthalate (PET), the plastic used for the bottles themselves. That mix points to the packaging and bottling process as the likely source of the contamination, rather than the water source itself.
Are microplastics in bottled water harmful?
The honest answer is that the health effects of ingesting microplastics are still being studied, and our current understanding is incomplete. The concern researchers raise is twofold.
First, plastic particles can absorb and carry other substances they encounter in the environment, such as industrial chemicals and pesticides. Some of those chemicals are known endocrine disruptors, meaning they can interfere with the hormonal system that regulates metabolism, growth, tissue function, and mood. Whether the amounts carried on microplastic particles in drinking water are enough to matter is an open question.
Second, there are unanswered questions about the particles themselves: whether they can cause irritation in the digestive tract, and whether the smallest particles can pass through the gut wall into other parts of the body. Rigorous long-term studies are still needed. What is already clear is simpler: a product marketed for purity contains plastic, and testing standards for bottled water are often less strict than those applied to municipal tap water.
So which bottled water is the worst?
The study did not rank one brand as the worst, and we are not going to invent a ranking it does not support. Every major brand tested contained some level of microplastic, the levels varied bottle to bottle, and a brand that tested high in one lot can test lower in another. If microplastics are your concern, the packaging format matters more than the label on it: water that sits in single-use plastic is where the particle counts came from.
Best bottled water to drink
If you are going to buy bottled water, the packaging is the variable you can actually control.
Glass bottles
Glass is inert, so it is far less likely to interact with the water it holds. That makes it an advantageous choice compared to type 1 PET plastic, which can leach chemicals into water under certain conditions, such as high heat. Glass bottles are also reusable, which is a genuine environmental advantage.
Aluminum cans
Canned water avoids single-use plastic bottles, and the can interior is lined to keep the aluminum from contacting the water. That lining is itself a plastic-based layer, so cans are a step up from plastic bottles but not equivalent to glass. Between the two, glass holds the edge: no lining required, fully non-reactive, and reusable.
A filtered water bottle instead
The cheapest and most reliable way out of the bottled water question is to stop buying it. A reusable filtered water bottle turns any tap into your water source, acts as a standing reminder to drink more water through the workday or at the gym, and eliminates a steady stream of single-use plastic.
Refilling one bottle instead of buying cases of water also pays for itself quickly. Bottled water costs hundreds of times more per gallon than filtered tap water.
The bottom line
There is no definitive worst bottled water brand, but the research is clear that single-use plastic bottles as a category carry more microplastic than tap water. The practical move is to skip the debate entirely: filter your own tap water and carry it in a reusable bottle.
Our filtered water bottles are made in the USA and built for exactly this, and the Pure XP pitcher is independently tested to reduce lead, PFAS, chlorine, and over 99.9% of microplastics at home. You can compare all of our bottles and pitchers to find the right fit.
Related reading
Sources
- Frontiers in Chemistry: Synthetic Polymer Contamination in Bottled Water
- Journal of Health, Population and Nutrition (NCBI): A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health
- Frontiers in Marine Science: A Growing Crisis for One Health: Impacts of Plastic Pollution Across Layers of Biological Function
Aquafina, Dasani, Evian, Nestle Pure, San Pellegrino, and Gerolsteiner are trademarks of their respective owners and are mentioned for identification purposes only. This article is for educational purposes and is not medical advice.
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