PFAS in Oyes's tap water: under 4 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 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 Mondement-Montgivroux, on the same distribution network as Oyes (CCSSOM MONDEMENT). 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 March 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | 0.009 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.006 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
Fails a current legal limit. The details are below.
Water report for Oyes
Get new PFAS results for Oyes, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 18 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 16 March 2026
- Water supplier
- CDC SEZANNE SUD-OUEST MARNAIS
In Oyes, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 16 March 2026. 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: 18 ng/L (0.018 µg/L), below the EU legal limit (100 ng/L). Sampled in Mondement-Montgivroux, on the same network. 2 checks since 24 June 2025: sum of 20 PFAS from 17 ng/L to 18 ng/L. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Oyes
2 PFAS checks since 24 June 2025, from the published measurements.
“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 |
|---|---|---|---|
| < 4 ng/L · calculated | 18 ng/L | Mondement-Montgivroux | |
| < 4 ng/L · calculated | 17 ng/L | Mondement-Montgivroux |
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.
Outside a reference value: Turbidity 2.3 NFU on 14 April 2025 (reference ≤ 2 NFU). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 50.4 mg/L | ≤ 50 mg/L | over the limit |
| Turbidity | 2.3 NFU | ≤ 2 NFU | above the reference value |
See all 7 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 50.4 mg/L | ≤ 50 mg/L | over the limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 6.9 unité pH | 6.5–9 unité pH | within the limit |
| Electrical conductivity | 645 µS/cm | 200–1,100 µS/cm | within the limit |
| Turbidity | 2.3 NFU | ≤ 2 NFU | above the reference value |
Frequently asked questions
Is tap water in Oyes safe to drink?
At the latest check, the water was over at least one limit. “Eau NON CONFORME pour les paramètres physico-chimiques contrôlés. Teneur en NITRATES supérieure à la limite de qualité fixée à 50 mg/l. L'eau peut être utilisée pour les usages sanitaires courants mais ne doit pas être consommée par les nourrissons et les femmes enceintes. Concernant le problème des NITRATES, une modification de la ressource est nécessaire. De plus, le résultat des analyses révèle une turbidité supérieure à la référence de qualité réglementaire fixée à 2 NFU pour une eau destinée à la consommation humaine. L'eau et les installations sont à surveiller. Des purges ponctuelles sur le réservoir et en distribution sont nécessaires dans l'immédiat. Un résiduel en chlore de 0,3 mg/l doit être maintenu en permanence sur le réseau de distribution.”
How high are PFAS levels in Oyes's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 18 ng/L. The EU limit is 100 ng/L, so this water is at 18 % of the limit. (below the EU limit)
Does the water in Oyes 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 Oyes'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 Oyes?
No hardness value is available for Oyes 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 Oyes, so in principle the same water.
Nearby communes
The closest to Oyes 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=51421
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- CCSSOM MONDEMENT
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.