PFAS in Saint-Joachim's tap water: under 3 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
None of the 4 most harmful PFAS detected
The lab sees nothing below 3 ng/L, 6 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 Nantes, on the same distribution network as Saint-Joachim (SAINT-NAZAIRE AGGLO - LA CARENE). 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 0.5 to 1.5 ng/L upward. None reached that limit, so their total is below 3 ng/L rather than zero.
checked on 7 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | 0.005 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.0042 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0023 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0005 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,0005 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,0015 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0015 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0015 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0015 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,0015 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0015 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,0005 µg/L |
None found. The lab sees nothing below 3 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Saint-Joachim
Get new PFAS results for Saint-Joachim, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 12 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 7 July 2026
- Water supplier
- SAINT-NAZAIRE AGGLO - LA CARENE
In Saint-Joachim, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 7 July 2026. The total is below 3 ng/L, the sum of the detection limits and 6 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 12 ng/L (0.012 µg/L), below the EU legal limit (100 ng/L). Sampled in Nantes, on the same network. 9 checks since 10 February 2025: PFAS-4 up to 5.1 ng/L, sometimes below the detection limit, averaging at least 1.34 ng/L over 12 months (non-detects as 0). Rising on the main network. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Saint-Joachim
23 PFAS checks since 23 January 2025, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Saint-Joachim.
“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 |
|---|---|---|---|
| < 3 ng/L · calculated | 12 ng/L | Nantes | |
| < 3 ng/L · calculated | 8.9 ng/L | Nantes | |
| < 3 ng/L · calculated | 8.9 ng/L | Nantes | |
| < 3 ng/L · calculated | < detection limit | Campbon | |
| < 3 ng/L · calculated | 4.9 ng/L | Nantes | |
| < 3 ng/L · calculated | 3.2 ng/L | Nantes | |
| 0.6 ng/L – < 3.1 ng/L · calculated | 6.6 ng/L | Nantes | |
| < 3 ng/L · calculated | 0.6 ng/L | Campbon | |
| < 3 ng/L · calculated | 1.1 ng/L | Nantes | |
| 4.5 ng/L | 24 ng/L | Férel | |
| 5.1 ng/L | 32 ng/L | Férel | |
| 2.5 ng/L | 18 ng/L | Férel |
Show the 11 earlier checks (back to 23 January 2025)
| 2.4 ng/L – < 3.9 ng/L · calculated | 3.2 ng/L | Campbon | |
| < 10 ng/L · calculated | < detection limit | Nantes | |
| < 10 ng/L · calculated | < detection limit | Nantes | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < detection limit | < detection limit | Férel | |
| < 10 ng/L · calculated | < detection limit | Campbon | |
| < 10 ng/L · calculated | < detection limit | Nantes |
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.
See all 17 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 6.1 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 0.7 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.0237 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 1.4 µg/L | ≤ 20 µg/L | within the limit |
| Cadmium | <0,010 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | 0.2 µg/L | ≤ 50 µg/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 | 7.5 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 31.7 °f | no limit | for reference |
| Electrical conductivity | 756 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 53.1 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 97.2 mg/L | ≤ 250 mg/L | within the limit |
| Iron | 27 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,30 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Saint-Joachim safe to drink?
Yes. At the check on 7 July 2026, the tap water in Saint-Joachim was within every limit tested. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Saint-Joachim's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 12 ng/L. The EU limit is 100 ng/L, so this water is at 12 % of the limit. (below the EU limit)
Does the water in Saint-Joachim 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 3 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 Saint-Joachim's tap water?
Yes. On the main network, the PFAS-4 sum rose from 2.5 ng/L (28 August 2025) to 4.5 ng/L (25 November 2025) across 3 quantified checks. pfasnearme's benchmark is 0.5 ng/L as an annual mean. These history statistics use laboratory-published sums only.
How hard is the water in Saint-Joachim?
The water hardness in Saint-Joachim is 31.7 °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 28 September 2026.
Same water network
Same distribution network as Saint-Joachim, so in principle the same water.
Nearby communes
The closest to Saint-Joachim 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=44168
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 September 2026
- Supply networks
- SAINT-NAZAIRE AGGLO - LA CARENE
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.