PFAS in Rochejean's tap water: 27 ng/L, 54x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
54× 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 Montperreux, on the same distribution network as Rochejean (ROCHEJEAN). 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 99% of the cities we track
checked on 3 December 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.019 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.007 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.006 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.006 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 45 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 3 December 2025
- Water supplier
- CC DES LACS ET MONTAGNES DU HAUT-DOUBS (CCLMHD)
In Rochejean, the 4 most closely watched PFAS (PFAS-4) add up to 27 ng/L (0.027 µg/L) at the latest PFAS check on 3 December 2025. That's 54 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 45 ng/L (0.045 µg/L), below the EU legal limit (100 ng/L). Sampled in Montperreux, on the same network. 3 checks since 15 April 2025: sum of 20 PFAS up to 45 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 Rochejean
3 PFAS checks since 15 April 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Rochejean.
“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 |
|---|---|---|---|
| 27 ng/L | 45 ng/L | Montperreux | |
| < 4 ng/L · calculated | 6 ng/L | Montperreux | |
| < 4 ng/L · calculated | < 100 ng/L | Rochejean |
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.
Values to watch
These results are close to their legal limit, or over it.
Outside a reference value: Turbidity 2.3 NFU on 28 July 2026 (reference ≤ 2 NFU). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Turbidity | 2.3 NFU | ≤ 2 NFU | above the reference value |
See all 20 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 2.9 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 2.6 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.203 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <2 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <1 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <2 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 | 7.7 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 23.6 °f | no limit | for reference |
| Electrical conductivity | 466 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 7.7 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 2.3 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 2.72 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 2.3 NFU | ≤ 2 NFU | above the reference value |
Frequently asked questions
Is tap water in Rochejean safe to drink?
Yes. At the check on 28 July 2026, the tap water in Rochejean was within every limit tested. Outside a reference value: Turbidity 2.3 NFU on 28 July 2026 (reference ≤ 2 NFU). These are indicator parameters with reference values, not legal limits. “EAU NON SATISFAISANTE (code de la santé publique). L'eau prélevée, qui présente une couleur jaunâtre, ne respecte pas les exigences de q ualité physico-chimique en raison de la turbidité, ce qui entraîne des désagréments pour les usagers et renforce le risque de contaminat ion microbiologique.”
How high are PFAS levels in Rochejean's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 45 ng/L. The EU limit is 100 ng/L, so this water is at 45 % of the limit. (below the EU limit)
Does the water in Rochejean also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 27 ng/L. That is 6.8 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 Rochejean'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 Rochejean?
The water hardness in Rochejean is 23.6 °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.
Nearby communes
The closest to Rochejean 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=25494
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- ROCHEJEAN
Water report for Rochejean
Get new PFAS results for Rochejean, 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.