PFAS in the tap water of Bassens (Savoie): under 4 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
None of the 4 most harmful PFAS detected
The lab sees nothing below 4 ng/L, 8 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 Chambéry, on the same distribution network as Bassens (RESEAU DE JOPPET). 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 1 ng/L upward. None reached that limit, so their total is below 4 ng/L rather than zero.
checked on 30 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorobutane (PFBS) | 0.001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 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 perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
None found. The lab sees nothing below 4 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Bassens
Get new PFAS results for Bassens, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 1 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 30 July 2026
- Water supplier
- CA DU GRAND CHAMBÉRY
In Bassens, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 30 July 2026. The total is below 4 ng/L, the sum of the detection limits and 8 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 1 ng/L (0.001 µg/L), below the EU legal limit (100 ng/L). Sampled in Chambéry, on the same network. 11 checks since 22 October 2025: PFAS-4 up to 33 ng/L, sometimes below the detection limit, averaging at least 14.13 ng/L over 12 months (non-detects as 0). Falling on the main network. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Bassens
20 PFAS checks since 20 February 2024, from the published measurements. Samples from 5 communes on the same network: it's the same water, so each one applies to Bassens. Samples come from 2 distribution networks. The trend refers to the network “RESEAU DE JOPPET”.
“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 |
|---|---|---|---|---|
| < 4 ng/L | 1 ng/L | Chambéry | RESEAU DE JOPPET | |
| < 4 ng/L | < 29 ng/L | Challes-les-Eaux | RESEAU DE SAINT JEAN DE LA PORTE | |
| 12 ng/L | 22 ng/L | Chambéry | RESEAU DE JOPPET | |
| < 4 ng/L | < 29 ng/L | Barby | RESEAU DE SAINT JEAN DE LA PORTE | |
| 14 ng/L | 34 ng/L | Bassens | RESEAU DE JOPPET | |
| 12 ng/L | 29 ng/L | Chambéry | RESEAU DE JOPPET | |
| 18 ng/L | 38 ng/L | Chambéry | RESEAU DE JOPPET | |
| 13 ng/L | 31 ng/L | Chambéry | RESEAU DE JOPPET | |
| < 4 ng/L | < 29 ng/L | Saint-Jean-de-la-Porte | RESEAU DE SAINT JEAN DE LA PORTE | |
| 11 ng/L | 25 ng/L | Chambéry | RESEAU DE JOPPET | |
| 33 ng/L | 73 ng/L | Chambéry | RESEAU DE JOPPET | |
| 10 ng/L – < 11 ng/L · calculated | 22 ng/L | Chambéry | RESEAU DE JOPPET |
Show the 8 earlier checks (back to 20 February 2024)
| < 4 ng/L · calculated | 1 ng/L | Chambéry | RESEAU DE JOPPET | |
| < 4 ng/L · calculated | 2 ng/L | Chambéry | RESEAU DE JOPPET | |
| 8 ng/L – < 9 ng/L · calculated | 18 ng/L | Chambéry | RESEAU DE JOPPET | |
| < 4 ng/L · calculated | < 1 ng/L | Chambéry | RESEAU DE JOPPET | |
| 39 ng/L – < 40 ng/L · calculated | 87 ng/L | Chambéry | RESEAU DE JOPPET | |
| 37 ng/L – < 38 ng/L · calculated | 97 ng/L | Chambéry | RESEAU DE JOPPET | |
| 28.9 ng/L – < 29.9 ng/L · calculated | 62 ng/L | Chambéry | RESEAU DE JOPPET | |
| 37 ng/L – < 38 ng/L · calculated | 65 ng/L | Chambéry | RESEAU DE JOPPET |
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 | 11.5 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,03 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 0.31 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.008 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <1 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <0,50 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,10 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <0,50 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | 0.42 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.12 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 | 7.5 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 30.9 °f | no limit | for reference |
| Electrical conductivity | 632 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 12.1 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 23.2 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 8.36 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,20 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Bassens safe to drink?
Yes. At the check on 30 July 2026, the tap water in Bassens 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 Bassens's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 1 ng/L. The EU limit is 100 ng/L, so this water is at 1 % of the limit. (below the EU limit)
Does the water in Bassens also meet the strictest limits in Europe?
As far as this check can tell, yes. None of the four compounds was quantified, so their total is below 4 ng/L, the sum of the laboratory's detection limits, and under Sweden's legal limit of 4 ng/L in force since 2026.
Are PFAS levels rising in Bassens's tap water?
No, they are falling. On the main network, the PFAS-4 sum went from 33 ng/L (22 October 2025) to 12 ng/L (2 April 2026) across 7 quantified checks. These history statistics use laboratory-published sums only.
How hard is the water in Bassens?
The water hardness in Bassens 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 Bassens, so in principle the same water.
Nearby communes
The closest to Bassens 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=73031
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- RESEAU DE JOPPET, RESEAU DE SAINT JEAN DE LA PORTE
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.