PFAS in Thiers'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 3 October 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <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 perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <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 Thiers
Get new PFAS results for Thiers, 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
- 3 October 2025
- Water supplier
- RÉGIE DES EAUX THIERS DORE ET MONTAGNE
In Thiers, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 3 October 2025. 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). 4 checks since 20 June 2025: PFAS-4 up to 5 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 Thiers
12 PFAS checks since 17 May 2024, from the published measurements. Samples come from 3 distribution networks. The trend refers to the network “THIERS BAS SERVICE”.
“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 | Network |
|---|---|---|---|
| 5 ng/L | 5 ng/L | THIERS BAS SERVICE | |
| < 4 ng/L | < 29 ng/L | THIERS MONTSAUVY CHASSIGNOL | |
| 4 ng/L – < 7 ng/L · calculated | 4 ng/L | THIERS BAS SERVICE | |
| 2 ng/L | 3 ng/L | THIERS BAS SERVICE | |
| < 20 ng/L | < 28 ng/L | THIERS MONTSAUVY CHASSIGNOL | |
| < 4 ng/L · calculated | 4 ng/L | LES BELINS | |
| 2 ng/L – < 5 ng/L · calculated | 6 ng/L | THIERS BAS SERVICE | |
| 4 ng/L – < 6 ng/L · calculated | 5 ng/L | THIERS BAS SERVICE | |
| 5 ng/L – < 7 ng/L · calculated | 5 ng/L | THIERS BAS SERVICE | |
| 5 ng/L – < 7 ng/L · calculated | 5 ng/L | THIERS BAS SERVICE | |
| 4.2 ng/L – < 11.2 ng/L · calculated | 4.2 ng/L | THIERS BAS SERVICE | |
| 8.1 ng/L – < 10.1 ng/L · calculated | 8.1 ng/L | THIERS BAS SERVICE |
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: pH 5.8 unité pH on 17 July 2026 (reference 6.5–9 unité pH), Electrical conductivity 154 µS/cm on 17 July 2026 (reference 200–1,100 µS/cm). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| pH | 5.8 unité pH | 6.5–9 unité pH | below the reference value |
| Electrical conductivity | 154 µS/cm | 200–1,100 µS/cm | below the reference value |
See all 20 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 9.3 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 | N.M. mg(Cu)/L | ≤ 2 mg(Cu)/L | no verdict |
| Nickel | <5 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 3 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 |
| 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 | 5.8 unité pH | 6.5–9 unité pH | below the reference value |
| Water hardness | 3.95 °f | no limit | for reference |
| Electrical conductivity | 154 µS/cm | 200–1,100 µS/cm | below the reference value |
| Chloride | 18.5 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 6.8 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 4.4 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.2 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Thiers safe to drink?
Yes. At the check on 17 July 2026, the tap water in Thiers was within every limit tested. Outside a reference value: pH 5.8 unité pH on 17 July 2026 (reference 6.5–9 unité pH), Electrical conductivity 154 µS/cm on 17 July 2026 (reference 200–1,100 µS/cm). These are indicator parameters with reference values, not legal limits. “Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité.”
How high are PFAS levels in Thiers'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 Thiers 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 Thiers's tap water?
Too few quantified checks to say (2 since 17 May 2024). pfasnearme adds each new publication weekly; a trend needs at least three quantified values. These history statistics use laboratory-published sums only.
How hard is the water in Thiers?
The water hardness in Thiers is 4 °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 Thiers 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=63430
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- THIERS MONTSAUVY CHASSIGNOL, LES BELINS, THIERS BAS SERVICE
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.