PFAS in Saint-Jean-de-Soudain's tap water: 20 ng/L, 40x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
40× 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 La Tour-du-Pin, on the same distribution network as Saint-Jean-de-Soudain (VALLONS TOUR PRINCIPAL). 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.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 98% of the cities we track
checked on 9 April 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.012 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.004 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.004 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.004 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.004 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.003 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | 0.001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 35 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 9 April 2026
- Water supplier
- CC LES VALS DU DAUPHINÉ
In Saint-Jean-de-Soudain, the 4 most closely watched PFAS (PFAS-4) add up to 20 ng/L (0.02 µg/L) at the latest PFAS check on 9 April 2026. That's 40 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 35 ng/L (0.035 µg/L), below the EU legal limit (100 ng/L). Sampled in La Tour-du-Pin, on the same network. 4 checks since 26 September 2025: PFAS-4 up to 21 ng/L, sometimes below the detection limit, averaging 19.67 ng/L over 12 months. No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Saint-Jean-de-Soudain
19 PFAS checks since 16 March 2023, from the published measurements. Samples from 4 communes on the same network: it's the same water, so each one applies to Saint-Jean-de-Soudain. Samples come from 2 distribution networks. The trend refers to the network “VALLONS TOUR PRINCIPAL”.
“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 | Network |
|---|---|---|---|---|
| 20 ng/L | 35 ng/L | La Tour-du-Pin | VALLONS TOUR PRINCIPAL | |
| 18 ng/L | 34 ng/L | Saint-Clair-de-la-Tour | VALLONS TOUR PRINCIPAL | |
| 21 ng/L | 54 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| < 4 ng/L | < 29 ng/L | Dolomieu | MOYEN SERVICE EST ET HAUT SERVICE | |
| < 4 ng/L · calculated | < 28 ng/L | Dolomieu | MOYEN SERVICE EST ET HAUT SERVICE | |
| 21 ng/L – < 22 ng/L · calculated | 36 ng/L | Saint-Clair-de-la-Tour | VALLONS TOUR PRINCIPAL | |
| 25 ng/L · calculated | 40 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 26 ng/L · calculated | 42 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| < 4 ng/L · calculated | 1 ng/L | Dolomieu | MOYEN SERVICE EST ET HAUT SERVICE | |
| 32 ng/L · calculated | 47 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 34 ng/L · calculated | 49 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 32 ng/L · calculated | 49 ng/L | Cessieu | VALLONS TOUR PRINCIPAL |
Show the 7 earlier checks (back to 16 March 2023)
| 32 ng/L · calculated | 56 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 2.8 ng/L – < 5.8 ng/L · calculated | 10.7 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 36.5 ng/L · calculated | 56.5 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 14 ng/L – < 15 ng/L · calculated | 30.7 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 7.1 ng/L – < 10.1 ng/L · calculated | 32.3 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 12.8 ng/L – < 13.8 ng/L · calculated | 32 ng/L | Cessieu | VALLONS TOUR PRINCIPAL | |
| 25.4 ng/L – < 30.4 ng/L · calculated | 44.8 ng/L | Cessieu | VALLONS TOUR PRINCIPAL |
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 17 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 16.8 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <2 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.042 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | N.M. µg/L | ≤ 6 µg/L | no verdict |
| 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 | 7.32 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 29.76 °f | no limit | for reference |
| Electrical conductivity | 632 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 21.2 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 17.7 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 4.1 mg/L | ≤ 200 mg/L | within the limit |
| Turbidity | 0.34 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Saint-Jean-de-Soudain safe to drink?
Yes. At the check on 22 July 2026, the tap water in Saint-Jean-de-Soudain 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 Saint-Jean-de-Soudain's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 35 ng/L. The EU limit is 100 ng/L, so this water is at 35 % of the limit. (below the EU limit)
Does the water in Saint-Jean-de-Soudain also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 20 ng/L. That is 5 times Sweden's legal limit of 4 ng/L, in force since 2026. Germany will set a similar one in 2028. The water still passes the current EU legal limit (100 ng/L for the total of 20 PFAS).
Are PFAS levels rising in Saint-Jean-de-Soudain's tap water?
No clear trend. Since 16 March 2023, 4 checks have been published; on the main network the PFAS-4 sum ranged between 18 ng/L and 21 ng/L (3 quantified values), at times below the detection limit. pfasnearme only reports a trend from a change of at least 25 % and 1 ng/L. These history statistics use laboratory-published sums only.
How hard is the water in Saint-Jean-de-Soudain?
The water hardness in Saint-Jean-de-Soudain is 29.8 °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 21 September 2026.
Same water network
Same distribution network as Saint-Jean-de-Soudain, so in principle the same water.
Nearby communes
The closest to Saint-Jean-de-Soudain 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=38401
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- VALLONS TOUR PRINCIPAL, MOYEN SERVICE EST ET HAUT SERVICE
Water report for Saint-Jean-de-Soudain
Get new PFAS results for Saint-Jean-de-Soudain, 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.