All posts

Bottled water and PFAS: is it actually better than tap water?

Published 13 September 2026 · pfasnearme

When a commune is above the benchmark, the reflex is to buy bottles. We understand the reflex. But the 2025 and 2026 tests show that bottled water does not escape PFAS, that it is far less publicly monitored than tap water, and that over a year it costs more than a filter that removes more. Here are the numbers, then when a bottle still makes sense.

What the French tests found

In February 2026, Que Choisir analysed 32 bottled waters sold in France, 25 natural mineral waters and 7 spring waters. TFA was found in 21 of them. Thonon water topped the list at 650 ng/L. Eleven products had nothing at the detection limit, including Evian, Cristaline, Perrier, Quézac, Saint-Yorre and Abatilles [1][2].

A year earlier, the same association had done the exercise on tap water in 30 communes, looking for 33 PFAS. Twenty-nine of thirty contained at least one. TFA in 24. In Paris, 6,200 ng/L of TFA. In Moussac, in the Gard, near a former plant, 13,000 ng/L. Only one commune, Roubaix, had nothing [3][4].

Anses confirmed the scale of the problem with its national campaign from 2023 to 2025, more than 600 samples of distributed water. TFA was present in 92% of samples, with a median of 780 ng/L [5]. So yes, tap water generally contains more TFA than bottled water. But bottles are not free of it, and that is the point the marketing leaves out.

TFA is not PFOA

We have to be honest about what these numbers measure. TFA, trifluoroacetic acid, is the smallest of the PFAS. It comes mostly from the breakdown of pesticides and refrigerant gases. It is not in the regulated sum of 20 PFAS, and it will only become mandatory in tap water monitoring from January 2027 [11]. Its toxicity is far less documented than PFOA or PFOS, and the strictest health value in Europe, in the Netherlands, is 2,200 ng/L [2].

The four PFAS this site tracks, PFOA, PFOS, PFNA and PFHxS, are a different matter. They are the ones EFSA assessed, the ones IARC classified, the ones that build up in blood for years. For these four, mineral waters from deep aquifers are generally very low. But "generally" is not an analysis result, and that is where it hurts.

The real problem with bottles is opacity

For any commune in France you can read here the latest PFAS result, its date, the laboratory, and soon three years of history. The law imposes that on the water supplier. For a bottled water, nothing comparable exists. The HCSP wrote it in black and white in July 2024. It is "essential to publish as quickly as possible" PFAS levels in bottled water, and it asks that its 20 ng/L value for the four PFAS apply to mineral waters for drinking as well [9].

The Senate inquiry of May 2025 showed what that opacity allows. Nestlé Waters used banned activated carbon filters and UV treatments for years on Perrier, Vittel, Hépar and Contrex, then proposed to replace them with 0.2 micron microfiltration without a clear legal basis. Two million bottles of Perrier were destroyed in 2021 [10]. This is not a PFAS story. But it is proof that "naturally pure" water is a claim, not a measurement.

What the international tests say

In the US, the Johns Hopkins team analysed 101 bottled waters for 32 PFAS. Thirty-nine contained some. The median was low, 0.98 ng/L, and 97% of products were below 5 ng/L. The most useful result is that "purified" waters, treated by reverse osmosis, contained clearly less than untreated spring waters [7]. Consumer Reports, across 47 products, found PFAS mostly in sparkling waters, up to 9.76 ng/L [8].

In Europe, PAN Europe tested 19 mineral and spring waters from eleven countries in 2024. Twelve contained TFA, average 278 ng/L, maximum 3,200 ng/L. In parallel, 34 of the 36 tap waters tested contained it, average 740 ng/L [6]. The one-to-three ratio between tap and bottle shows up everywhere. It is not a ratio of zero to something.

The one-year sum

A family of four drinks about six litres a day, formula and cooking included. In 1.5 L bottles at 0.30 € for the cheapest, that is roughly 440 € a year, and more than two tonnes of full bottles to carry. In branded mineral water, more than double. An under-sink reverse osmosis unit costs 200 to 600 € to buy and 50 to 100 € a year to maintain, and it removes more than 94% of PFAS, all chain lengths included. We go through it in the filter guide.

And there is the plastic. Many people just buy more and more bottles without thinking of a more environmentally friendly solution, when a filter at the tap settles the question once and for all.

When a bottle still makes sense

There are three cases where we would say yes without hesitating.

• The first weeks after an alert, while the filter is being installed or the supplier switches wells. Especially for infant formula and during pregnancy.
• When the ARS or the prefecture explicitly recommends not drinking network water, which remains rare for PFAS.
• When you cannot install a filter, renting, travelling, and the commune is above 20 ng/L of PFAS-4.

In those cases, pick a product that has published recent PFAS analyses or that is among the eleven without TFA in the 2026 test, and check the date. A spring water is not necessarily better than a mineral water. In the US test it was the reverse for ultrashort chains [7].

In short

Bottled water has on average less TFA than tap water, but it is not PFAS-free, it is not publicly monitored, and it costs more than a filter that does better. Read your commune's result first. Use bottles as a bridge, not a destination. And keep the question that really matters, the four PFAS that accumulate, for the tap, where you can check it.

Frequently asked questions

Does bottled water contain PFAS?

Often, yes. In 2026 Que Choisir found TFA, an ultrashort-chain PFAS, in 21 of 32 bottled waters, up to 650 ng/L. Eleven had none at the detection limit. In the US, a study of 101 bottled waters found PFAS in 39.

Which bottled water is PFAS-free?

In Que Choisir's 2026 test, eleven products had no detectable TFA, including Evian, Cristaline, Perrier, Quézac, Saint-Yorre, Abatilles, Lutecia, Saint-Amand, Rocheval and two retailer spring waters. That is not a guarantee over time or for other PFAS.

Does tap water have more PFAS than bottled water?

For TFA, yes, clearly. Anses found a median of 780 ng/L at the tap, against an average of 278 ng/L in the European mineral waters tested by PAN Europe. For the four most toxic PFAS, both are generally very low, but tap water is the only one of the two whose results are public commune by commune.

Should I switch to bottled water if my commune is above the benchmark?

For a few weeks, while waiting for a filter or a decision from the supplier, yes, especially for infant formula. For years, no. A reverse osmosis unit costs less and removes more PFAS than a bottle guarantees.

Is glass better than plastic for PFAS?

For PFAS it makes almost no difference. The PFAS found in bottles come from the source, not the packaging. Glass avoids other questions, such as microplastics, but not this one.

Sources

1. Que Choisir (19 February 2026): Eaux en bouteille, nos analyses ont révélé la présence de polluants éternels (32 bottled waters, TFA in 21)
2. Le Messager (27 February 2026): Polluants éternels, l'eau de Thonon en tête d'un test national de Que Choisir (650 ng/L TFA)
3. Que Choisir (23 January 2025): Eau potable, une contamination massive aux PFAS (30 communes, 33 PFAS)
4. Générations Futures (January 2025): Polluants éternels dans l'eau du robinet, présence détectée dans 96 % des communes testées (TFA in 24 of 30, Danish and US comparisons)
5. Anses: PFAS, les résultats de la campagne nationale de mesure dans l'eau destinée à la consommation, 2023-2025 (TFA in 92% of samples, median 780 ng/L)
6. PAN Europe (2024): TFA, the forever chemical in the water we drink (36 tap waters, 19 bottled waters across Europe)
7. Chow et al. (2021), Water Research: Detection of ultrashort-chain and other PFAS in U.S. bottled water (101 products, 39 with PFAS)
8. Consumer Reports (24 September 2020): What's really in your bottled water? (47 products, 30 PFAS)
9. HCSP (9 July 2024): avis PFAS dans les EDCH et les eaux minérales naturelles (20 ng/L applies to mineral water too, calls for publication of PFAS levels in bottled water)
10. Sénat (May 2025): commission d'enquête, Eaux minérales naturelles, préserver la pureté (Nestlé Waters, banned treatments, microfiltration)
11. Décret n° 2025-1287 du 22 décembre 2025 (TFA and 6:2 FTSA added to tap water monitoring from 1 January 2027)

All sources retrieved September 2026. The full method is on the methodology page. The synthesis was prepared with the help of an AI and then checked against the primary sources.