Drinking water quality in L'Île-Saint-Denis
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at <0,005 µg/L. The EU limit is 0.1 µg/L, so this water is at 0 % of the limit. (18 May 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 perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,005 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
Water report for L'Île-Saint-Denis
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Official assessment
The authorities have not published an overall verdict for this water.
„Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.“
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 21.2 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | 0.016 mg/L | ≤ 0.5 mg/L | within limit |
| Lead | 0.1 µg/L | ≤ 10 µg/L | within limit |
| Copper | 0.0066 mg(Cu)/L | ≤ 2 mg(Cu)/L | within limit |
| Nickel | 0.6 µg/L | ≤ 20 µg/L | within limit |
| Arsenic | 0.36 µg/L | ≤ 10 µg/L | within limit |
| Cadmium | <1,00 µg/L | ≤ 5 µg/L | within limit |
| Chromium | <5,000 µg/L | ≤ 6 µg/L | within limit |
| Uranium | 0.22 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.13 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 | 7.7 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 21.4 °f | no limit | informational |
| Electrical conductivity | 537 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 30.8 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 34.5 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 19.3 mg/L | ≤ 200 mg/L | within limit |
| Iron | <20,0 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | <0,10 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in L'Île-Saint-Denis safe to drink?
All the values shown here (18 May 2026) are within the legal limits, but the authorities have not published an overall verdict for this water.
How high are PFAS levels in L'Île-Saint-Denis's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at <0,005 µg/L. The EU limit is 0.1 µg/L, so this water is at 0 % of the limit. (below the EU limit)
Does the water in L'Île-Saint-Denis 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 L'Île-Saint-Denis?
The water hardness in L'Île-Saint-Denis is 21.4 °f (medium). 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=93039
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- UDI SEDIF NEUILLY, UDI SEDIF MERY
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.