Is bottled water bad for you?

For most healthy adults, bottled water is safe to drink occasionally, but it is not automatically healthier than tap water. Studies have detected micro- and nanoplastics in bottled water, while the long-term health effects remain uncertain. Standard PET bottles are not made with BPA or phthalates, which are associated with other food-contact materials. Where tap water is safe, a suitable, well-maintained filter can be a practical everyday alternative.

Bottled water can be useful when you are travelling, during an emergency or in a place where the local supply is unsafe or unavailable. The question is different when bottled water becomes your main source of drinking water every day.

In that situation, it is worth looking at the evidence rather than assuming that a bottle automatically means purer or healthier water.

What is actually in bottled water?

The answer depends on the type of water, its source, its treatment and its packaging. “Bottled water” can refer to natural mineral water, spring water or purified water. These products do not all have the same mineral profile or treatment process.

The important distinction is between something being detected and something being proven to cause harm at the level found in drinking water. Good health communication needs to make that distinction clear.

Microplastics and nanoplastics in bottled water

Microplastics have been found in bottled water in many studies. They can come from the bottle, the cap, the bottling process or the water itself. Tap water can also contain plastic particles, so bottled water is not the only possible source of exposure.

A 2024 study published in the Proceedings of the National Academy of Sciences used a newer imaging method to examine five samples from three bottled-water brands. The researchers estimated an average of roughly 240,000 plastic particles per litre, most of them nanoplastics. The study was important because earlier methods could not detect many of the smallest particles.

However, the result should not be presented as a universal count for every bottle of water. The research tested a small number of samples and used a particular analytical method. It also detected particles; it did not prove that drinking those samples causes a specific disease.

The World Health Organization has highlighted the need for more research into microplastics in drinking water. Based on the limited evidence available, it concluded that microplastics did not appear to pose a health risk at the levels assessed at the time, while also pointing out major uncertainties, especially around very small particles.

The sensible conclusion is neither panic nor complacency. If you can safely reduce unnecessary contact with single-use plastic, doing so may reduce avoidable exposure and also creates less waste.

Does bottled water contain BPA or phthalates?

This is where many online articles become misleading.

Standard PET, the plastic commonly used for single-use water bottles, is not made with BPA. BPA is more closely associated with materials such as polycarbonate and with some coatings used in food and drink packaging. In December 2024, the European Commission adopted a ban on BPA in food-contact materials, taking into account EFSA’s risk assessment.

Phthalates are plasticisers used in some plastics, particularly flexible plastics. They are not the material that gives PET its characteristic properties. A claim that “PET bottles leach phthalates” should therefore not be stated as a general fact without identifying the bottle material, the specific phthalate and the study.

That does not mean that every form of packaging is identical or that “BPA-free” is a complete safety guarantee. It means that the risk discussion needs to distinguish PET from other plastics, and laboratory detection from a demonstrated health outcome.

Why do some bottled waters contain sodium bicarbonate or calcium chloride?

Some bottled waters are purified before being sold. Purification can remove much of the original mineral content, so manufacturers may add minerals or salts afterwards to adjust the taste, pH or composition.

Sodium bicarbonate is a salt that can contribute to a more rounded taste. Calcium chloride can also be used to adjust mineral content and mouthfeel. Seeing either ingredient on a label does not mean that the water is dangerous. It simply tells you something about how that particular product was treated or formulated.

If you have been advised to limit sodium, check the nutritional information and the mineral analysis on the label rather than assuming that every bottled water has the same composition.

Is it bad to drink bottled water every day?

Drinking bottled water every day is not automatically dangerous for a healthy adult. However, it is also not automatically healthier than drinking safe tap water.

Daily bottled water has several practical disadvantages:

• You pay repeatedly for water that may be available through your tap.
• Single-use packaging creates additional material waste and transport impacts.
• The water may be exposed to packaging, caps and storage conditions for long periods.
• You have less control over the mineral profile and treatment process than you may assume.
• A bottle labelled “natural”, “spring” or “mineral” is not necessarily healthier for your personal needs.

If your local tap water is safe but you dislike its taste, a suitable filter can improve the taste and reduce specific substances, provided the system is designed for the relevant concern and maintained correctly.

Is filtered tap water safer than bottled water?

There is no universal answer for every country, building or filter. In an area with safe public water, filtered tap water can be a sensible everyday option because it avoids single-use bottles and allows you to target a defined concern, such as chlorine taste.

Different filters do different jobs. A faucet filter may be useful for taste and point-of-use filtration. A reverse-osmosis system removes a broader range of dissolved substances but also removes minerals, which is why some systems add them back afterwards.

You can explore Tappwater faucet filters for everyday tap-water filtration. The EcoPro tap filter has its own product-specific testing and claims, which should be read before choosing it. For users looking for a more extensive purification process, Tappwater reverse osmosis and the Countertop RO SMR provide a different type of solution.

Not sure how the three options compare overall? Read our guide to bottled, filtered and tap water.

The bottom line

Bottled water is a useful option when safe tap water is unavailable. For everyday drinking where the public supply is safe, however, it is not automatically purer or healthier.

Micro- and nanoplastics have been detected in bottled water, but the health effects at current exposure levels are still being investigated. Standard PET bottles should not be described as if they routinely contain BPA or phthalates.

The most accurate conclusion is simple: choose water based on the local supply, your specific needs, the packaging and the evidence — not on the assumption that bottled always means better.

Frequently asked questions

Is bottled water bad for you every day?

For most healthy adults, drinking bottled water every day is not automatically dangerous. However, it is not automatically healthier than safe tap water and involves higher cost, single-use packaging and potential exposure to particles detected in some studies.

Is bottled water safer than tap water?

Not necessarily. Safety depends on the quality of the local tap supply, the condition of building plumbing, the bottled product and how each is regulated and tested. Bottled water is useful when tap water is unsafe or unavailable.

Does bottled water contain microplastics?

Microplastics and nanoplastics have been detected in bottled water, although the amount varies between studies and products. Their long-term health effects from drinking-water exposure are not yet fully understood.

Does bottled water contain BPA?

Standard PET water bottles are not made with BPA. BPA is associated with other food-contact materials, including some polycarbonate plastics and coatings. Packaging materials should be identified before making a specific claim.

Are there phthalates in bottled water?

Phthalates are plasticisers used in some plastics, but they are not the defining plasticiser of PET. Whether a phthalate is present depends on the packaging and the specific testing method, so general claims about all bottled water are not reliable.

What are sodium bicarbonate and calcium chloride doing in bottled water?

They are mineral salts that may be added to some purified waters to adjust taste or composition. They are not inherently dangerous at permitted levels, although people following a medically advised low-sodium diet should check the label.

Sources

• World Health Organization — Microplastics in drinking-water
• Qian et al. — Rapid single-particle chemical imaging of nanoplastics, PNAS
• NIH — Plastic particles in bottled water
• European Commission — BPA ban in food-contact materials
• Peer-reviewed study on phthalates in PET bottled water