PFAS in Clermont-Ferrand's tap water: under 4 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
No 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.
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 20 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <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 Clermont-Ferrand
Get new PFAS results for Clermont-Ferrand, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- none detected sum of 20 PFAS below the detection limit, limit 100 ng/L
- Last PFAS test
- 20 July 2026
- Water supplier
- CLERMONT AUVERGNE METROPOLE AEP
In Clermont-Ferrand, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 20 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: <0,029 µg/L, below the EU legal limit (100 ng/L). 16 checks since 3 June 2025: PFAS-4 up to 7 ng/L, sometimes below the detection limit, averaging at least 1.25 ng/L over 12 months (non-detects as 0). No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Clermont-Ferrand
17 PFAS checks since 14 May 2025, from the published measurements. Samples from 4 communes on the same network: it's the same water, so each one applies to Clermont-Ferrand. Samples come from 4 distribution networks. The trend refers to the network “CLERMONT FERRAND RESEAU ALLIER”.
“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 | < 29 ng/L | Clermont-Ferrand | CLERMONT FERRAND RESEAU ALLIER, CLERMONT FERRAND RESEAU CHAMPRADET | |
| 1 ng/L | 2 ng/L | Clermont-Ferrand | CLERMONT FERRAND RESEAU ALLIER | |
| < 4 ng/L | < 29 ng/L | Clermont-Ferrand | CLERMONT FERRAND RESEAU DES ROCHES | |
| 3 ng/L | 4 ng/L | Clermont-Ferrand | CLERMONT FERRAND HAUT DE VALLIERES | |
| 4 ng/L | 7 ng/L | Chamalières | CLERMONT FERRAND HAUT DE VALLIERES | |
| < 4 ng/L | < 29 ng/L | Clermont-Ferrand | CLERMONT FERRAND RESEAU DES ROCHES | |
| 1 ng/L | 1 ng/L | Chamalières | CLERMONT FERRAND RESEAU DES ROCHES | |
| 1 ng/L | 1 ng/L | Cournon-d'Auvergne | CLERMONT FERRAND RESEAU ALLIER | |
| 1 ng/L | 1 ng/L | Chamalières | CLERMONT FERRAND RESEAU DES ROCHES | |
| 7 ng/L | 24 ng/L | Durtol | CLERMONT FERRAND RESEAU CHAMPRADET | |
| 3 ng/L | 3 ng/L | Cournon-d'Auvergne | CLERMONT FERRAND RESEAU ALLIER | |
| 1 ng/L | 1 ng/L | Cournon-d'Auvergne | CLERMONT FERRAND RESEAU ALLIER |
Show the 5 earlier checks (back to 14 May 2025)
| < 20 ng/L | < 1 ng/L | Chamalières | CLERMONT FERRAND RESEAU DES ROCHES | |
| 6 ng/L | 6 ng/L | Durtol | CLERMONT FERRAND RESEAU CHAMPRADET | |
| < 20 ng/L | < 1 ng/L | Cournon-d'Auvergne | CLERMONT FERRAND RESEAU ALLIER | |
| < 20 ng/L | < 1 ng/L | Chamalières | CLERMONT FERRAND RESEAU DES ROCHES | |
| < 4 ng/L · calculated | 4 ng/L | Cournon-d'Auvergne | CLERMONT FERRAND RESEAU ALLIER |
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
The authorities have not published an overall verdict for this water.
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 11.2 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 | 0.022 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 4.56 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <5 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | <10 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.24 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 | 8.72 unité pH | 6.5–9.5 pH | within the limit |
| Water hardness | 6.55 °f | no limit | for reference |
| Electrical conductivity | 270 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 30.9 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 7.9 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 24.3 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Clermont-Ferrand safe to drink?
All the values shown here (20 July 2026) are within the legal limits, but the authorities have not published an overall verdict for this water. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Clermont-Ferrand's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 29 ng/L. The EU limit is 100 ng/L, so this water is under 29 % of the limit. (below the EU limit)
Does the water in Clermont-Ferrand 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 Clermont-Ferrand's tap water?
No clear trend. Since 14 May 2025, 16 checks have been published; on the main network the PFAS-4 sum ranged between 1 ng/L and 3 ng/L (4 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 Clermont-Ferrand?
The water hardness in Clermont-Ferrand is 6.6 °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.
Nearby communes
The closest to Clermont-Ferrand 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=63113
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- CLERMONT FERRAND RESEAU ALLIER, CLERMONT FERRAND RESEAU DES ROCHES, CLERMONT FERRAND RESEAU CHAMPRADET, CLERMONT FERRAND HAUT DE VALLIERES
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.