PFAS in Châteaulin's tap water: 1.2 ng/L, 2.4x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
2.4× 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.
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 84% of the cities we track
checked on 22 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.0012 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,005 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,005 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 1.2 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 22 July 2026
- Water supplier
- VEOLIA EAU BRETAGNE OUEST
In Châteaulin, the 4 most closely watched PFAS (PFAS-4) add up to 1.2 ng/L (0.0012 µg/L) at the latest PFAS check on 22 July 2026. That's 2.4 times our 0.5 ng/L health benchmark, but below Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 1.2 ng/L (0.0012 µg/L), below the EU legal limit (100 ng/L). 10 checks since 14 April 2025: PFAS-4 up to 6 ng/L, sometimes below the detection limit. No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Châteaulin
11 PFAS checks since 25 March 2025, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Châteaulin. Samples come from 3 distribution networks. The trend refers to the network “CHATEAULIN - EXTERIEURS (AULNE)”.
“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 |
|---|---|---|---|---|
| 1.2 ng/L | 1.2 ng/L | Châteaulin | CHATEAULIN - CENTRE (LOCH), CHATEAULIN - CENTRE (LOCH) | |
| < detection limit | < detection limit | Châteaulin | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < detection limit | 2.6 ng/L | Dinéault | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < detection limit | 5.6 ng/L | Cast | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| 3.4 ng/L | 3.4 ng/L | Châteaulin | 029000747 | |
| 6 ng/L | 6 ng/L | Cast | CHATEAULIN - CENTRE (LOCH), CHATEAULIN - CENTRE (LOCH) | |
| < detection limit | 4.1 ng/L | Dinéault | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < detection limit | < detection limit | Cast | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < detection limit | < detection limit | Dinéault | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < detection limit | < detection limit | Cast | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) | |
| < 6 ng/L · calculated | < detection limit | Dinéault | CHATEAULIN - EXTERIEURS (AULNE), CHATEAULIN - EXTERIEURS (AULNE) |
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: Electrical conductivity 152 µS/cm on 22 July 2026 (reference 200–1,100 µS/cm). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Electrical conductivity | 152 µS/cm | 200–1,100 µS/cm | below the reference value |
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 4.2 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <0,4 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.005 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <1 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <1 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <1 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | 0.11 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.051 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 7.7 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 13 °f | no limit | for reference |
| Electrical conductivity | 152 µS/cm | 200–1,100 µS/cm | below the reference value |
| Chloride | 18.3 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 2.7 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 11.9 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 1.2 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.11 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Châteaulin safe to drink?
Yes. At the check on 22 July 2026, the tap water in Châteaulin was within every limit tested. Outside a reference value: Electrical conductivity 152 µS/cm on 22 July 2026 (reference 200–1,100 µS/cm). These are indicator parameters with reference values, not legal limits. “Eau prélevée conforme aux limites de qualité. A noter une conductivité inférieure à la valeur de référence minimale de 200µS/cm. Eau agressive. Une optimisation du traitement de neutralisation-minéralisation à l'unité de production est nécessaire. A noter aussi une température mesurée in situ supérieure à la référenc e de qualité fixée à 25°C.”
How high are PFAS levels in Châteaulin's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 1.2 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 Châteaulin also meet the strictest limits in Europe?
Yes. Even against Europe's strictest legal limit, Sweden's 4 ng/L in force since 2026, the measured value of 1.2 ng/L stays below.
Are PFAS levels rising in Châteaulin's tap water?
No. Since 25 March 2025, 10 checks have been published; on the main network the PFAS-4 sum stayed below the laboratory's detection limit every time. These history statistics use laboratory-published sums only.
How hard is the water in Châteaulin?
The water hardness in Châteaulin is 13 °f (soft). 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 Châteaulin, so in principle the same water.
Nearby communes
The closest to Châteaulin 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=29026
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- CHATEAULIN - CENTRE (LOCH), CHATEAULIN - EXTERIEURS (AULNE)
Water report for Châteaulin
Get new PFAS results for Châteaulin, 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.