PFAS in the tap water of Saint-Denis (Seine-Saint-Denis): under 8 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
No PFAS detected
The lab sees nothing below 8 ng/L, 16 times our benchmark of 0.5 ng/L. Water above our benchmark would pass this check unnoticed.
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 Aulnay-sous-Bois, on the same distribution network as Saint-Denis (UDI SEDIF NEUILLY). 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.
The lab detects each of the four substances from 2 ng/L upward. None reached that limit, so their total is below 8 ng/L rather than zero.
checked on 27 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
None found. The lab sees nothing below 8 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Saint-Denis
Get new PFAS results for Saint-Denis, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- none detected sum of 20 PFAS below the detection limit, limit 100 ng/L
- Last PFAS test
- 27 July 2026
- Water supplier
- FRANCILIANE
In Saint-Denis, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 27 July 2026. The total is below 8 ng/L, the sum of the detection limits and 16 times our 0.5 ng/L benchmark. Sum of 20 PFAS: <0,005 µg/L, below the EU legal limit (100 ng/L). Sampled in Aulnay-sous-Bois, on the same network. 29 checks since 2 April 2025: sum of 20 PFAS up to 13 ng/L, sometimes below the detection limit. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Saint-Denis
29 PFAS checks since 2 April 2025, from the published measurements. Samples from 6 communes on the same network: it's the same water, so each one applies to Saint-Denis.
“Calculated”: PFAS-4 worked out from the four substances in the same sample. The chart, averages and trends use lab-published sums only.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at |
|---|---|---|---|
| < 8 ng/L · calculated | < 5 ng/L | Aulnay-sous-Bois | |
| 2 ng/L – < 8 ng/L · calculated | 2 ng/L | Noisy-le-Grand | |
| 2 ng/L – < 8 ng/L · calculated | 2 ng/L | Noisy-le-Grand | |
| 5 ng/L – < 9 ng/L · calculated | 5 ng/L | Aubervilliers | |
| < 8 ng/L · calculated | < 5 ng/L | L'Île-Saint-Denis | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| 7 ng/L – < 11 ng/L · calculated | 7 ng/L | Drancy | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Saint-Denis | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | 6 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand |
Show the 17 earlier checks (back to 2 April 2025)
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | 4 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | 4 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | 13 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | 6 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand | |
| < 8 ng/L · calculated | < 5 ng/L | Noisy-le-Grand |
Calculated values: “<” is an upper bound from published thresholds, “≥” a lower bound, “–” means no published sum or complete measurement. How to read a PFAS result
What the latest check found
At the latest check, the water was within every limit tested.
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 12 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <0,1 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.0029 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 0.5 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 0.26 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1,00 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <6,00 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | 0.55 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.15 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 7.6 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 30.9 °f | no limit | for reference |
| Electrical conductivity | 590 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 32.6 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 63.6 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 11.1 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <20,0 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,10 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Saint-Denis safe to drink?
Yes. At the check on 27 July 2026, the tap water in Saint-Denis was within every limit tested. “Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité.”
How high are PFAS levels in Saint-Denis's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 5 ng/L. The EU limit is 100 ng/L, so this water is under 5 % of the limit. (below the EU limit)
Does the water in Saint-Denis also meet the strictest limits in Europe?
The check cannot say. None of the four compounds was quantified, but the laboratory's detection limits add up to 8 ng/L, above Sweden's legal limit of 4 ng/L in force since 2026, so a value between the two would go unnoticed.
Are PFAS levels rising in Saint-Denis's tap water?
Calculated PFAS-4 values are listed in the table. The chart uses laboratory-published sum-of-20 results; there are too few laboratory-published PFAS-4 sums for the existing trend calculation.
How hard is the water in Saint-Denis?
The water hardness in Saint-Denis is 30.9 °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 21 September 2026.
Same water network
Same distribution network as Saint-Denis, so in principle the same water.
Nearby communes
The closest to Saint-Denis 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=93066
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- UDI SEDIF NEUILLY
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.