Drinking water quality in Saint-Denis
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.046 µg/L. The EU limit is 0.1 µg/L, so this water is at 46 % of the limit. (8 June 2026)
The four most harmful PFAS add up to 0.025 µg/L. That is 6.3 times the health limit of 0.004 µg/L that Sweden made law in 2026. Germany will set a similar limit in 2028.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
Substances too small to measure count as 0, so the real total may be higher.
20 PFAS (see each substance)
| Acide sulfonique de perfluorooctane (PFOS) | 0.015 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.01 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.007 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.006 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.005 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.003 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
Water report for Saint-Denis
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Official assessment
The latest official test passed all quality requirements.
„Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité.“
Show all 17 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 0.8 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,05 mg/L | ≤ 0.5 mg/L | within limit |
| Lead | <0,1 µg/L | ≤ 10 µg/L | within limit |
| Copper | 0.0027 mg(Cu)/L | ≤ 2 mg(Cu)/L | within limit |
| Nickel | <0,2 µg/L | ≤ 20 µg/L | within limit |
| Chromium | 1.82 µg/L | ≤ 50 µg/L | within limit |
| Uranium | 0.06 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.21 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 | 7.8 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 4 °f | no limit | informational |
| Electrical conductivity | 97 µS/cm | 200–1,100 µS/cm | exceeded |
| Chloride | 2.4 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 0.6 mg/L | ≤ 250 mg/L | within limit |
| Turbidity | <0,20 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Saint-Denis safe to drink?
Yes. The latest official test (29 June 2026) checked the tap water in Saint-Denis and it passed every requirement.
How high are PFAS levels in Saint-Denis's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.046 µg/L. The EU limit is 0.1 µg/L, so this water is at 46 % of the limit. (below the EU limit)
Does the water in Saint-Denis also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 0.025 µg/L. That is 6.3 times the health limit of 0.004 µg/L that Sweden made law in 2026. The water still passes the current EU limit (0.1 µg/L for the total of 20 PFAS).
How hard is the water in Saint-Denis?
The water hardness in Saint-Denis is 4 °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 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=97411
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- RESEAU BELLEPIERRE, RESEAU STE-CLOTILDE A, RESEAU STE-CLOTILDE B, RESEAU LE BRULE, RESEAU ST-FRANCOIS A, RESEAU ST-FRANCOIS B, RESEAU BOIS DE NEFLES, RESEAU ILET QUINQUINA, RESEAU LA MONTAGNE, RESEAU LA GRANDE CHALOUPE, RESEAU PARC TRINITE, RESEAU DOMENJOD - COMMUNE PRIMA, RESEAU LA BRETAGNE, RESEAU BRETAGNE BASSE, RESEAU BRETAGNE HAUTE
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.