Drinking water quality in Fos-sur-Mer
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.015 µg/L. The EU limit is 0.1 µg/L, so this water is at 15 % of the limit. (29 April 2026)
The four most harmful PFAS add up to 0 µg/L, below the health limit of 0.004 µg/L used in Sweden since 2026.
Substances too small to measure count as 0, so the real total may be higher.
20 PFAS (see each substance)
| Acide perfluoropentanoïque (PFPEA) | 0.006 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.005 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
Water report for Fos-sur-Mer
Get the free water report for Fos-sur-Mer, plus an alert whenever new official results are published.
Official assessment
The latest official test passed all quality requirements.
„L’eau d’alimentation est conforme aux limites de qualité et non conforme aux références de qualité pour le paramètre température.“
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 8.7 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within limit |
| Lead | <2 µg/L | ≤ 10 µg/L | within limit |
| Copper | 0.02 mg/L | ≤ 2 mg/L | within limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within limit |
| Arsenic | <2 µg/L | ≤ 10 µg/L | within limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within limit |
| Chromium | <5 µg/L | ≤ 50 µg/L | within limit |
| Uranium | <10 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | <0,05 mg/L | ≤ 1.5 mg/L | within limit |
| Escherichia coli | <1 n/(100mL) | ≤ 0 mL) | within limit |
| Enterococci | <1 n/(100mL) | ≤ 0 mL) | within limit |
| Coliform bacteria | <1 n/(100mL) | ≤ 0 mL) | within limit |
| pH | 7.3 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 34.22 °f | no limit | informational |
| Electrical conductivity | 717 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 18.7 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 107 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 13.7 mg/L | ≤ 200 mg/L | within limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Fos-sur-Mer safe to drink?
Yes. The latest official test (3 June 2026) checked the tap water in Fos-sur-Mer and it passed every requirement.
How high are PFAS levels in Fos-sur-Mer's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.015 µg/L. The EU limit is 0.1 µg/L, so this water is at 15 % of the limit. (below the EU limit)
Does the water in Fos-sur-Mer also meet the strictest limits in Europe?
Yes. Even against Europe's strictest limit, the health limit of 0.004 µg/L used in Sweden since 2026, the measured value of 0 µg/L stays below.
How hard is the water in Fos-sur-Mer?
The water hardness in Fos-sur-Mer is 34.22 °f (hard). 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 28 August 2026.
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=13039
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- FOS-SUR-MER, RESEAU GRAND PORT MARITIME DE MARSEILLE - RESEAU ZIF
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.