PFAS in Île-d'Arz's tap water: 1.7 ng/L, 3.4x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
3.4× 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.
Sample taken in Férel, on the same distribution network as Île-d'Arz (VANNES OUEST). The health authority samples one tap per network; a network carries the same treated water everywhere.
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 85% of the cities we track
checked on 23 June 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorobutanoïque (PFBA) | 0.0035 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.0032 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0023 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.0012 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.0009 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.0008 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,0015 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0015 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0015 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,0015 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0015 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,0015 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0015 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 12 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 23 June 2026
- Water supplier
- SAUR
In Île-d'Arz, the 4 most closely watched PFAS (PFAS-4) add up to 1.7 ng/L (0.0017 µg/L) at the latest PFAS check on 23 June 2026. That's 3.4 times our 0.5 ng/L health benchmark, but below Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 12 ng/L (0.012 µg/L), below the EU legal limit (100 ng/L). Sampled in Férel, on the same network. 25 checks since 10 February 2025: PFAS-4 up to 5.1 ng/L, sometimes below the detection limit, averaging at least 0.9 ng/L over 12 months (non-detects as 0). No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Île-d'Arz
25 PFAS checks since 10 February 2025, values as published. Samples from 4 communes on the same network: it's the same water, so each one applies to Île-d'Arz.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at |
|---|---|---|---|
| 1.7 ng/L | 12 ng/L | Férel | |
| < detection limit | 2.9 ng/L | Sainte-Anne-d'Auray | |
| 0.8 ng/L | 11 ng/L | Férel | |
| < detection limit | 4.8 ng/L | Férel | |
| < detection limit | < detection limit | Ploeren | |
| < detection limit | 0.6 ng/L | Sainte-Anne-d'Auray | |
| 0.6 ng/L | 5.9 ng/L | Férel | |
| < detection limit | 1.3 ng/L | Vannes | |
| 0.5 ng/L | 6.5 ng/L | Férel | |
| < detection limit | 0.6 ng/L | Sainte-Anne-d'Auray | |
| < detection limit | 3.8 ng/L | Férel | |
| 0.5 ng/L | 6.8 ng/L | Vannes |
Show the 13 earlier checks (back to 10 February 2025)
| 4.5 ng/L | 24 ng/L | Férel | |
| 5.1 ng/L | 32 ng/L | Férel | |
| < detection limit | 4.5 ng/L | Sainte-Anne-d'Auray | |
| < detection limit | 1.2 ng/L | Sainte-Anne-d'Auray | |
| 2.5 ng/L | 18 ng/L | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Sainte-Anne-d'Auray | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Sainte-Anne-d'Auray | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel |
“<” means not detected, the figure being the detection limit. “–” means not published. Labs have only reported the PFAS-4 sum (SANDRE code 9268) since autumn 2025. How to read a PFAS result
What the latest check found
At the latest check, the water was within every limit tested.
See all 12 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 8.7 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Cadmium | <0,05 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <0,5 µg/L | ≤ 50 µg/L | within the limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 8 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 11.3 °f | no limit | for reference |
| Electrical conductivity | 359 µS/cm | 200–1,100 µS/cm | within the limit |
| Iron | 7 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,30 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Île-d'Arz safe to drink?
Yes. At the check on 23 June 2026, the tap water in Île-d'Arz was within every limit tested. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Île-d'Arz's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 12 ng/L. The EU limit is 100 ng/L, so this water is at 12 % of the limit. (below the EU limit)
Does the water in Île-d'Arz 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 1.7 ng/L stays below.
Are PFAS levels rising in Île-d'Arz's tap water?
No clear trend. Since 10 February 2025, 25 checks have been published; on the main network the PFAS-4 sum ranged between 0.5 ng/L and 5.1 ng/L (8 quantified values), at times below the detection limit. pfasnearme only reports a trend from a change of at least 25 % and 1 ng/L.
How hard is the water in Île-d'Arz?
The water hardness in Île-d'Arz is 11.3 °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.
Same water network
Same distribution network as Île-d'Arz, so in principle the same water.
Nearby communes
The closest to Île-d'Arz 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=56088
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- VANNES OUEST
Water report for Île-d'Arz
Get new PFAS results for Île-d'Arz, 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.