PFAS in Dierrey-Saint-Julien's tap water: under 8 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 8 ng/L, 16 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 2 ng/L upward. None reached that limit, so their total is below 8 ng/L rather than zero.
checked on 18 February 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,005 µg/L |
Fails a current legal limit. The details are below.
Water report for Dierrey-Saint-Julien
Get new PFAS results for Dierrey-Saint-Julien, 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
- 18 February 2026
- Water supplier
- REGIE DU S.D.D.E.A.
In Dierrey-Saint-Julien, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 18 February 2026. The total is below 8 ng/L, the sum of the detection limits and 16 times our 0.5 ng/L benchmark. Sum of 20 PFAS: <0,005 µg/L, below the EU legal limit (100 ng/L). 2 checks since 14 April 2025, sum of 20 PFAS always below the detection limit (5 ng/L). Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Dierrey-Saint-Julien
2 PFAS checks since 14 April 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Dierrey-Saint-Julien.
“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 |
|---|---|---|---|
| < 8 ng/L · calculated | < 5 ng/L | Dierrey-Saint-Julien | |
| < 2 ng/L | < 5 ng/L | Dierrey-Saint-Pierre |
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 over at least one limit.
Values to watch
These results are close to their legal limit, or over it.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 54 mg/L | ≤ 50 mg/L | over the limit |
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 54 mg/L | ≤ 50 mg/L | over the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 0.3 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.0018 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <0,2 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 0.25 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,01 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | 0.19 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | 0.21 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.06 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 | 7.7 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 24.7 °f | no limit | for reference |
| Electrical conductivity | 510 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 25 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 10 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 5.1 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 2 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Dierrey-Saint-Julien safe to drink?
At the latest check, the water was over at least one limit. “Cette eau est non conforme à la limite de qualité réglementaire fixée à 50 mg/l pour le paramètre nitrates. La consommation régulière d’une eau présentant une teneur excessive en nitrates est susceptible à long terme d’engendrer des risques pour la santé du consommateur et plus particulièrement, pour les femmes enceintes, les enfants de moins de deux ans (méthémoglobinémie du nourrisson ou « maladie bleue ») et pour toute personne fragilisée par une maladie. De ce fait, cette eau ne doit pas être consommée par les populations à risques. Conformément aux articles R.1321-26 à 30 du code de la santé publique, il revient à l’exploitant d’informer la population, et plus particulièrement les personnes à risques pour lesquelles une eau de source embouteillée doit être mise à disposition. Cette restriction partielle des usages de l’eau est en vigueur jusqu’à ce qu’un retour à la conformité ait été confirmé par un nouveau prélèvement réalisé dans le cadre du contrôle sanitaire.”
How high are PFAS levels in Dierrey-Saint-Julien's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 5 ng/L. The EU limit is 100 ng/L, so this water is under 5 % of the limit. (below the EU limit)
Does the water in Dierrey-Saint-Julien also meet the strictest limits in Europe?
The check cannot say. None of the four compounds was quantified, but the laboratory's detection limits add up to 8 ng/L, above Sweden's legal limit of 4 ng/L in force since 2026, so a value between the two would go unnoticed.
Are PFAS levels rising in Dierrey-Saint-Julien's tap water?
Calculated PFAS-4 values are listed in the table. The chart uses laboratory-published sum-of-20 results; there are too few laboratory-published PFAS-4 sums for the existing trend calculation.
How hard is the water in Dierrey-Saint-Julien?
The water hardness in Dierrey-Saint-Julien is 24.7 °f (medium). 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 Dierrey-Saint-Julien, so in principle the same water.
Nearby communes
The closest to Dierrey-Saint-Julien 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=10124
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- DIERREY ST P. DIERREY ST J. RESEAU
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.