A pack of water added to the trolley every week, a few bottles in the fridge, one taken to work… For many people in France, drinking bottled water every day has become a reflex.
This habit is often based on a belief: that bottled water is healthier, purer or more pleasant to drink than tap water. Yet the differences between these two ways of drinking water are more complex than they seem.
Beyond water quality, daily consumption raises several questions: what do we know about exposure to microplastics? How much does this habit really cost over ten or twenty years? And how many plastic bottles does it represent for a family?
At FLX Water, we look at these questions from a simple perspective: understanding what is in the water we drink and identifying solutions that reduce our dependence on bottles, without compromising quality.
Here is what scientific studies and simple calculations tell us about the long-term impacts of drinking bottled water.
Why do we keep choosing bottled water?
For many consumers, bottled water inspires confidence. It is packaged, labeled and sold under an identifiable brand. Some mineral waters also highlight their composition and geographical origin.
Tap water, by contrast, can raise questions: chlorine, unusual taste, limescale, the condition of the pipes, or concerns about certain contaminants such as PFAS and pesticides.
Not all these concerns are unfounded. The quality of distributed water can vary depending on local resources, treatment and networks.
But one important distinction must be made: bottled water is not automatically healthier than tap water.
In France, tap water is subject to regulatory health monitoring. Packaged waters are also subject to requirements and checks, depending on their category: natural mineral water, spring water or water made drinkable by treatment.
These waters may have different mineral compositions, but their price or packaging is not an indicator of their sanitary quality.
The right question is therefore not simply whether the water comes from a bottle or a tap, but to understand its composition, its compliance and the conditions in which it is distributed or stored.
Is drinking bottled water every day bad for your health?
It would be wrong to claim that drinking bottled water every day necessarily causes health problems.
Bottled water that meets health requirements, is properly stored and suits the consumer's needs can be drunk regularly.
However, several topics are now attracting growing scientific attention, notably the presence of plastic particles in some bottled waters and possible interactions between the water, its packaging and storage conditions.
Microplastics and nanoplastics
Microplastics are very small plastic particles found in many environments. Nanoplastics are even smaller and require particularly sensitive analytical techniques to be identified.
Studies have detected these particles in tap water as well as in bottled water.
Their presence in packaged water can have various origins: the source water, the treatment and bottling stages, the equipment used, or the materials of the packaging and cap.
The fact that a bottle is sealed and sold therefore does not mean it is completely free of plastic particles.
The role of storage conditions
Plastic bottles are designed to come into contact with food under defined conditions of use.
It is still recommended to follow the storage instructions, in particular by avoiding leaving bottles in direct sunlight for long periods or in a vehicle exposed to high temperatures.
Heat, storage time and the characteristics of the materials can influence certain phenomena of substance migration or particle release.
This does not mean that a bottle left in the sun for a few hours automatically becomes toxic. However, it is best to store water in the conditions specified by the manufacturer.
Microplastics in bottled water: what do the studies really say?
In January 2024, a study published in the scientific journal Proceedings of the National Academy of Sciences (PNAS) drew attention to the plastic particles found in some bottled waters.
The researchers analyzed three brands of bottled water using an imaging technique capable of detecting particles much smaller than those generally looked for previously.
The result: an estimated average of around 240,000 microplastic and nanoplastic particles per liter in the samples studied, most of them nanoplastics.
This figure is striking, but it must be interpreted correctly.
It does not mean that all bottled waters sold in France contain exactly this concentration. The study covered a limited number of brands and used a specific analytical method.
Above all, it shows that methods capable of detecting the finest particles can reveal contamination that was previously underestimated.
Another study, published in 2025 in the journal Emerging Contaminants, compared 177 tap water samples from 13 UK cities with 85 bottled water samples from 17 brands.
In this study, average microplastic concentrations were similar in both categories, with no statistically significant difference. This shows that it would be excessive to present all bottled waters as systematically more contaminated than all tap waters.
Results depend in particular on the size of the particles looked for, the measurement techniques and the samples studied.
What are the effects of repeated exposure over several years?
This is precisely one of the main questions research is currently trying to answer.
Experimental work is studying possible interactions between microplastics, nanoplastics and the human body, including inflammatory mechanisms, oxidative stress and the crossing of certain biological barriers.
However, the presence of particles in water is not enough to demonstrate a specific health effect in a person who drinks it every day.
The World Health Organization (WHO) highlights significant knowledge gaps, particularly for the smallest particles and chronic exposure.
A scientific review published in 2025 in the Journal of Hazardous Materials also stresses the need to improve measurement methods and studies on potential long-term effects.
Three notions should therefore be distinguished:
- Presence: plastic particles can be detected in water.
- Exposure: repeated consumption can contribute to a person's overall exposure.
- Health risk: the precise consequences of chronic exposure at the levels actually encountered are still not sufficiently established.
To date, it would be scientifically incorrect to claim that drinking bottled water every day necessarily causes a particular disease.
However, the uncertainties about long-term effects justify further research and questioning which sources of exposure can be avoided.
How much does bottled water cost over 5, 10 or 20 years?
While the long-term health effects are still partly under study, the financial impact of daily consumption is much easier to calculate.
Let's take an illustrative assumption: one person drinks 1.5 liters of bottled water per day, bought at an assumed average price of €0.30 per liter.
This is not an official average market price, but a basis for simulation to measure the cumulative cost of this habit.
| Period | 1 person | Family of 4 |
|---|---|---|
| 1 year | €164 | €657 |
| 5 years | €821 | €3,285 |
| 10 years | €1,643 | €6,570 |
| 20 years | €3,285 | €13,140 |
Rounded figures, at constant consumption and prices, excluding inflation, promotions and any delivery costs.
For a family of four, this habit therefore represents more than €13,000 over twenty years in our scenario.
The real cost obviously depends on the brand, the packaging and purchasing habits. Some waters are much cheaper, while others go well beyond this assumption.
But even with inexpensive water, the expense becomes significant when it is repeated every week for several years.
On top of this come constraints that do not appear on the receipt: carrying packs, storing them at home, dealing with packaging and making regular trips to restock.
How many plastic bottles does this habit represent over 20 years?
Beyond the budget, drinking bottled water every day means repeatedly using packaging.
Let's go back to our example: 1.5 liters of water per person per day, packaged in 1.5-liter bottles.
One person thus uses the equivalent of one bottle a day, or 365 bottles a year.
For a family of four, this represents:
| Period | Number of 1.5 L bottles | Volume of water consumed |
|---|---|---|
| 1 year | 1,460 | 2,190 liters |
| 5 years | 7,300 | 10,950 liters |
| 10 years | 14,600 | 21,900 liters |
| 20 years | 29,200 | 43,800 liters |
Nearly 30,000 bottles for a single family over twenty years, in this simulation.
These figures are not an estimate of the actual average consumption of French families: they illustrate the cumulative consequences of a daily habit.
What is the environmental impact of bottled water?
A plastic bottle is not just waste after use.
Its environmental impact begins long before it reaches the fridge.
Manufacturing the packaging
Water bottles are often made of PET, a plastic whose production requires raw materials and energy.
Manufacturing caps, labels and multipack packaging also contributes to resource use.
Using recycled plastic can reduce some impacts, but does not eliminate them entirely.
Transport and distribution
Bottled water has to be packaged, stored, transported to stores and then carried home.
The associated emissions depend on the distance traveled, the mode of transport and the logistics organization.
Transporting water every day when it is already available through a public network therefore represents additional resource consumption, when that network supplies drinking water fit for consumption.
Recycling does not eliminate all impacts
PET bottles can be recycled when they are properly collected and sent to a suitable recycling stream.
Recycling is important, but it also requires collection, sorting and processing operations.
Moreover, not all bottles are actually recycled, and littered waste can contribute to the pollution of natural environments.
The best waste is therefore the waste we avoid producing whenever possible.
For a household drinking several bottles a day, buying less bottled water can significantly reduce the amount of packaging used over the years.
Bottled water or tap water: which should you choose?
The comparison cannot be reduced to "one is good and the other is bad".
In France, tap water is subject to health checks covering various microbiological and chemical parameters. The results are available to the public, notably at municipality level.
Bottled waters are also regulated, but their composition and treatment may differ depending on whether they are natural mineral water, spring water or water made drinkable by treatment.
There are also situations in which bottled water remains essential or preferable, particularly when the health authorities advise against drinking mains water.
For a household supplied with compliant tap water, the choice may depend more on taste, convenience, cost and environmental concerns.
It is also worth remembering that taste alone cannot be used to assess the sanitary quality of water.
Water with a slight taste of chlorine is not necessarily dangerous, and water with no particular taste is not automatically free of contaminants.
To better understand this point, read our article on the causes of chlorine taste in tap water and how to reduce it.
How can you reduce your bottled water consumption day to day?
For many households, gradually switching from bottled water to tap water is an accessible step.
The first step is to check the quality of the water distributed in your municipality, then to identify what really drives the purchase of bottles.
Is it a question of taste? A concern about contaminants? A preference for a certain mineral composition? Or simply a habit built up over several years?
The possible solutions depend on the answer.
Improving the taste of water
When mains water is drinkable but tastes of chlorine, a few simple practices can help, such as leaving a carafe of water to stand in the fridge under proper hygiene conditions.
Activated carbon filtration can also help reduce certain compounds responsible for unpleasant tastes or odors.
Installing a point-of-use filter
Filter pitchers and filters fitted directly on the tap can treat drinking water.
Their performance depends on the technologies used, the contaminants targeted and compliance with maintenance requirements.
It is essential to change consumables according to the manufacturer's recommendations to maintain the intended performance.
Choosing centralized filtration
Another approach is to treat water as soon as it enters the home, rather than only at the kitchen tap.
This solution may appeal to households wishing to have filtered water at several points of use.
However, it requires equipment suited to the water quality, the flow rate of the home and the household's actual needs.
FLX Water: an alternative to drinking bottled water every day
At FLX Water, we develop filtration solutions designed to improve the quality of the water distributed in homes and to reduce systematic use of bottled water when it is not necessary.
For homes in France, the FLX Compact filters water centrally, after the water meter.
It combines three complementary technologies:
- 0.1 µm hollow fibers for the physical filtration of particles and contaminants suited to this technology.
- Electro-adsorption to complement the capture of certain charged particles.
- High-density activated carbon to help reduce certain compounds and improve the taste and odor of the water.
The system works using mains pressure, without the unit needing its own power supply and without added chemicals.
The aim is to offer a practical solution for households who want to drink more tap water while benefiting from suitable filtration.
It is important to remember, however, that no equipment should be presented as systematically removing all contaminants. Performance must be assessed according to the substances in question, the conditions of use and the tests available.
Centralized filtration does not replace health checks on the public network or official instructions in the event of consumption restrictions.
To compare the different approaches, also read our article on whole-house water filtration systems.
After 20 years, what is the real impact of bottled water?
Drinking bottled water every day is not, in itself, a practice whose negative health effects have been systematically demonstrated.
However, research on microplastics and nanoplastics shows that bottled water is not necessarily free of plastic particles. The consequences of repeated exposure remain an important scientific question.
The economic and material impacts, on the other hand, are easier to measure.
In our example of a family of four, each drinking 1.5 liters a day at €0.30 per liter, twenty years represent:
- 43,800 liters of bottled water consumed;
- 29,200 1.5-liter bottles used;
- €13,140 spent, at constant prices.
On top of this expense come the manufacture of the packaging, its transport and its disposal after use.
For households with compliant tap water, it may therefore be worth reconsidering this habit, especially as several solutions exist to make tap water more pleasant to drink.
At FLX Water, we believe quality water should be easily accessible, without systematically depending on single-use bottles.
Before changing your habits, the best approach is still to know the quality of your water and, if necessary, choose a suitable filtration solution.
Frequently asked questions
Is it dangerous to drink bottled water every day?
Compliant, properly stored bottled water can be drunk every day. However, studies have detected microplastics and nanoplastics in some bottled waters. Their precise health effects under chronic exposure are still not sufficiently established.
Do plastic bottles release microplastics into the water?
Packaging and caps can contribute to the presence of plastic particles in some bottled waters. Other sources are also possible, notably the source water and the bottling stages.
Can you drink a bottle of water that has been left in the sun?
It is best to follow the storage conditions indicated by the manufacturer and avoid prolonged exposure to heat or sunlight. If the bottle is deformed, damaged or shows any abnormality, it is better not to drink it.
Does bottled water contain fewer contaminants than tap water?
Not necessarily. Both categories are subject to health requirements, but their compositions can differ. Results depend on the source, the contaminants studied and the analytical methods used.
How much does bottled water cost for a family of four?
With a hypothetical consumption of 1.5 liters per person per day and a price of €0.30 per liter, the budget comes to about €657 a year, or €6,570 over ten years and €13,140 over twenty years, excluding inflation.
Is filtered water better than bottled water?
It all depends on the initial quality of the water and the performance of the filtration system. Suitable filtration can help reduce certain contaminants and improve taste, but it does not guarantee water free of all substances.
Sources
- World Health Organization – Microplastics in drinking-water: state of knowledge on microplastics in drinking water and limits of the available health data.
- National Institutes of Health – Plastic particles in bottled water: overview of the study published in 2024 on microplastics and nanoplastics detected in three brands of bottled water.
- PNAS – Rapid single-particle chemical imaging of nanoplastics by SRS microscopy: original scientific study on the detection of nanoplastics in bottled water.
- Emerging Contaminants – Synthetic Microplastics in UK tap and bottled water: comparative study of microplastics in tap water and bottled water in the United Kingdom.
- Journal of Hazardous Materials – Unveiling the hidden chronic health risks of nano- and microplastics in single-use plastic water bottles: 2025 scientific review on exposure to and potential risks of microplastics and nanoplastics.
- French Ministry of Health – Tap water: information on the quality of water distributed in France and its health monitoring.
- Service-Public.fr – Tap water quality: access to official information on drinking water quality.
Solution recommandée
FLX Compact
Filtration de l'eau sans électricité ni produits chimiques. Réduit les impuretés, les goûts et les odeurs.
