PFAS in Tannay-le-Mont-Dieu'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.
Sample taken in Lametz, on the same distribution network as Tannay-le-Mont-Dieu (S63 REGION LOUVERGNY). 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.
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 16 May 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
Fails a current legal limit. The details are below.
Water report for Tannay-le-Mont-Dieu
Get new PFAS results for Tannay-le-Mont-Dieu, 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
- 16 May 2025
- Water supplier
- MAIRIE DE BAIRON ET SES ENVIRONS
In Tannay-le-Mont-Dieu, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 16 May 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: <0,100 µg/L, below the EU legal limit (100 ng/L). Sampled in Lametz, 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 Tannay-le-Mont-Dieu
A single PFAS check has been published for Tannay-le-Mont-Dieu so far (16 May 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 over at least one limit.
Values to watch
These results are close to their legal limit, or over it.
Outside a reference value: Coliform bacteria 1.11 n/(100mL) on 27 July 2026 (reference ≤ 0 mL)). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 38.7 mg/L | ≤ 50 mg/L | within the limit |
| Escherichia coli | 1.11 n/(100mL) | ≤ 0 mL) | over the limit |
| Enterococci | 16 n/(100mL) | ≤ 0 mL) | over the limit |
| Coliform bacteria | 1.11 n/(100mL) | ≤ 0 mL) | above the reference value |
See all 20 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 38.7 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 2.4 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.06 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 1.4 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <0,5 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,5 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <0,5 µg/L | ≤ 50 µg/L | within the limit |
| Fluoride | <0,100 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | 1.11 n/(100mL) | ≤ 0 mL) | over the limit |
| Enterococci | 16 n/(100mL) | ≤ 0 mL) | over the limit |
| Coliform bacteria | 1.11 n/(100mL) | ≤ 0 mL) | above the reference value |
| pH | 7.2 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 32.8 °f | no limit | for reference |
| Electrical conductivity | 630 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 10.3 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 21.4 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 3.7 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <5 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,30 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Tannay-le-Mont-Dieu safe to drink?
At the latest check, the water was over at least one limit. “Eau d'alimentation non conforme aux exigences de qualité en vigueur sur le plan bactériologique. Le point de prélèvement se situe en amont de la chloration, il conviendra par conséquent de vérifier le bon fon ctionnement de la chloration en aval. Eau conforme sur le plan chimique.”
How high are PFAS levels in Tannay-le-Mont-Dieu's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 100 ng/L. The EU limit is 100 ng/L, so this water is under 100 % of the limit. (below the EU limit)
Does the water in Tannay-le-Mont-Dieu 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.
How hard is the water in Tannay-le-Mont-Dieu?
The water hardness in Tannay-le-Mont-Dieu is 32.8 °f (hard). 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 Tannay-le-Mont-Dieu, so in principle the same water.
Nearby communes
The closest to Tannay-le-Mont-Dieu 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=08439
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- S63 REGION LOUVERGNY
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.