PFAS in Coclois'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.
Sample taken in Isle-Aubigny, on the same distribution network as Coclois (LES QUATRE VALLEES RESEAU). 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 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 perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
Fails a current legal limit. The details are below.
Water report for Coclois
Get new PFAS results for Coclois, 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 Coclois, 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). Sampled in Isle-Aubigny, on the same network. 2 checks since 4 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 Coclois
2 PFAS checks since 4 April 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Coclois.
“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 | Isle-Aubigny | |
| < 2 ng/L | < 5 ng/L | Nogent-sur-Aube |
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 | 42 mg/L | ≤ 50 mg/L | within the limit |
See all 7 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 42 mg/L | ≤ 50 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 | 7.6 unité pH | 6.5–9 unité pH | within the limit |
| Electrical conductivity | 480 µS/cm | 200–1,100 µS/cm | within the limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Coclois safe to drink?
At the latest check, the water was over at least one limit. “Eau non conforme aux limites de qualité réglementaire fixées à 0,1 µg/L pour au moins un pesticide ou un métabolite de pesticide pertinent et à 0,5 µg/L pour la somme des molécules de pesticides. Cependant, la valeur sanitaire propre à chaque molécule n'a pas été dépassée. L'eau peut donc être consommée par tous. Dans une telle situation, le responsable de la distribution d'eau doit : informer la population et engager un programme visant à améliorer la situation. Un contrôle renforcé est en place pour vérifier l'évolution de ces paramètres. Il est à noter également une teneur en chlore libre trop élevée. La teneur en chlore libre sur le réseau de distribution doit être de l'ordre de 0,10 mg/l.”
How high are PFAS levels in Coclois'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 Coclois 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 Coclois'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 Coclois?
No hardness value is available for Coclois in this source.
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 12 September 2026.
Same water network
Same distribution network as Coclois, so in principle the same water.
Nearby communes
The closest to Coclois 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=10101
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- LES QUATRE VALLEES RESEAU
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.