PFAS in Île-de-Sein's tap water: 2.9 ng/L, 5.8x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
5.8× above our health benchmark
0.5 ng/L is our benchmark, not an official limit. Same EFSA method as Sweden, Denmark and the Netherlands, but stricter. It's a yearly average, compared here with the latest check.
More about this result
The US also limits PFOA and PFOS to 4 ng/L each, per substance.
Substances below the detection limit count as 0, so the real total may be higher.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 88% of the cities we track
checked on 2 September 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.0029 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
Fails a current legal limit. Here are some filter options.
- EU legal limit
- 2.9 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 2 September 2025
- Water supplier
- COMMUNE DE L'ILE DE SEIN
In Île-de-Sein, the 4 most closely watched PFAS (PFAS-4) add up to 2.9 ng/L (0.0029 µg/L) at the latest PFAS check on 2 September 2025. That's 5.8 times our 0.5 ng/L health benchmark, but below Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 2.9 ng/L (0.0029 µg/L), below the EU legal limit (100 ng/L). Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Île-de-Sein
A single PFAS check has been published for Île-de-Sein so far (2 September 2025). A history will build up with the next checks; this page is refreshed weekly.
What the latest check found
At the latest check, the water was over at least one limit.
Values to watch
These results are close to their legal limit, or over it.
Outside a reference value: Coliform bacteria 1 n/(100mL) on 7 July 2026 (reference ≤ 0 mL)), pH 9.7 unité pH on 7 July 2026 (reference 6.5–9 unité pH). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Escherichia coli | 1 n/(100mL) | ≤ 0 mL) | over the limit |
| Coliform bacteria | 1 n/(100mL) | ≤ 0 mL) | above the reference value |
| pH | 9.7 unité pH | 6.5–9 unité pH | above the reference value |
See all 17 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | <0,5 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Arsenic | <1 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | 1.8 µg/L | ≤ 50 µg/L | within the limit |
| Fluoride | <0,050 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | 1 n/(100mL) | ≤ 0 mL) | over the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 1 n/(100mL) | ≤ 0 mL) | above the reference value |
| pH | 9.7 unité pH | 6.5–9 unité pH | above the reference value |
| Water hardness | 0.72 °f | no limit | for reference |
| Electrical conductivity | 281 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 72.8 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 1.1 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 156 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 87 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.77 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Île-de-Sein safe to drink?
At the latest check, the water was over at least one limit. “Eau prélevée non conforme aux limites de qualité en raison de la détection de la bactérie E. coli. A noter un pH supérieur à la référence maximale de 9,0 ainsi que la pr ésence d'AMPA. Une optimisation du traitement par osmose est nécessair e. Pour les paramètres microbiologiques, lorsque le résultat indiqué est PRESENCE, il convient de considérer qu'il s'agit d'une simple détection de l'organisme dans l'eau et que le nombre de colonies est estimé entre 1 et 3.”
How high are PFAS levels in Île-de-Sein's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 2.9 ng/L. The EU limit is 100 ng/L, so this water is at 3 % of the limit. (below the EU limit)
Does the water in Île-de-Sein also meet the strictest limits in Europe?
Yes. Even against Europe's strictest legal limit, Sweden's 4 ng/L in force since 2026, the measured value of 2.9 ng/L stays below.
How hard is the water in Île-de-Sein?
The water hardness in Île-de-Sein is 0.7 °f (soft). This mainly matters for household appliances and detergent dosing, not for health.
Where does this data come from?
All values come from official publications: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM). Retrieved on 21 September 2026.
Nearby communes
The closest to Île-de-Sein on this site.
Data source
- Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM)
- https://hubeau.eaufrance.fr/api/v1/qualite_eau_potable/resultats_dis?code_commune=29083
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- ILE-DE-SEIN (PHARE)
Water report for Île-de-Sein
Get new PFAS results for Île-de-Sein, with a short explanation. At most one update a week, only when there's something new.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.