PFAS in Chênex's tap water: 18 ng/L, 36x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
36× 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 Feigères, on the same distribution network as Chênex (CHENEX). 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.
Substances below the detection limit count as 0, so the real total may be higher.
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 21 August 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Perfluorohexane sulfonate (PFHXS) | 0.007 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.006 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.005 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.004 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.004 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.003 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | 0.001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 34 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 21 August 2025
- Water supplier
- CC DU GENEVOIS
In Chênex, the 4 most closely watched PFAS (PFAS-4) add up to 18 ng/L (0.018 µg/L) at the latest PFAS check on 21 August 2025. That's 36 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 34 ng/L (0.034 µg/L), below the EU legal limit (100 ng/L). Sampled in Feigères, on the same network. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Chênex
A single PFAS check has been published for Chênex so far (21 August 2025). A history will build up with the next checks; this page is refreshed weekly.
What the latest check found
At the latest check, the water was within every limit tested.
Values to watch
These results are close to their legal limit, or over it.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 26 mg/L | ≤ 50 mg/L | within the limit |
See all 19 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 26 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 0.22 µg/L | ≤ 10 µg/L | within the limit |
| Copper | <0,001 mg/L | ≤ 2 mg/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 |
| Fluoride | <0,05 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 | 27.9 °f | no limit | for reference |
| Electrical conductivity | 524 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 6.2 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 9.8 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 18.3 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 Chênex safe to drink?
Yes. At the check on 19 March 2026, the tap water in Chênex 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 Chênex's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 34 ng/L. The EU limit is 100 ng/L, so this water is at 34 % of the limit. (below the EU limit)
Does the water in Chênex also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 18 ng/L. That is 4.5 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).
How hard is the water in Chênex?
The water hardness in Chênex is 27.9 °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 12 September 2026.
Nearby communes
The closest to Chênex 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=74069
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- CHENEX
Water report for Chênex
Get new PFAS results for Chênex, 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.