PFAS in Coye-la-Forêt's tap water: 5 ng/L, 10x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
10× above our health benchmark
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.
Substances below the detection limit count as 0, so the real total may be higher.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 92% of the cities we track
checked on 6 February 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.003 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 8 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 6 February 2026
- Water supplier
- SAUR FRANCE
In Coye-la-Forêt, the 4 most closely watched PFAS (PFAS-4) add up to 5 ng/L (0.005 µg/L) at the latest PFAS check on 6 February 2026. That's 10 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 8 ng/L (0.008 µg/L), below the EU legal limit (100 ng/L). 10 checks since 17 January 2024: sum of 20 PFAS from 2 ng/L to 8 ng/L. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Coye-la-Forêt
10 PFAS checks since 17 January 2024, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Coye-la-Forêt.
“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 |
|---|---|---|---|
| 5 ng/L | 8 ng/L | Coye-la-Forêt | |
| < 4 ng/L · calculated | 2 ng/L | Asnières-sur-Oise | |
| 2 ng/L – < 4 ng/L · calculated | 4 ng/L | Asnières-sur-Oise | |
| 5 ng/L – < 7 ng/L · calculated | 8 ng/L | Asnières-sur-Oise | |
| 2 ng/L – < 4 ng/L · calculated | 4 ng/L | Coye-la-Forêt | |
| 3 ng/L – < 5 ng/L · calculated | 7 ng/L | Asnières-sur-Oise | |
| 2 ng/L – < 4 ng/L · calculated | 5 ng/L | Asnières-sur-Oise | |
| 1 ng/L – < 5 ng/L · calculated | 4 ng/L | Asnières-sur-Oise | |
| < 4 ng/L · calculated | 2.9 ng/L | Asnières-sur-Oise | |
| < 4 ng/L · calculated | 2.8 ng/L | Asnières-sur-Oise |
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.
Values to watch
These results are close to their legal limit, or over it.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 44.4 mg/L | ≤ 50 mg/L | within the limit |
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 44.4 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <0,5 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.008 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 1.2 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 |
| Uranium | <10 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.262 mg/L | ≤ 1.5 mg/L | within 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 | 7.6 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 42.7 °f | no limit | for reference |
| Electrical conductivity | 905 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 31.6 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 109 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 15.4 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 26.5 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.35 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Coye-la-Forêt safe to drink?
Yes. At the check on 7 July 2026, the tap water in Coye-la-Forêt 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 Coye-la-Forêt's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 8 ng/L. The EU limit is 100 ng/L, so this water is at 8 % of the limit. (below the EU limit)
Does the water in Coye-la-Forêt also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 5 ng/L. That is 1.25 times Sweden's legal limit of 4 ng/L, in force since 2026. Germany will set a similar one in 2028. The water still passes the current EU legal limit (100 ng/L for the total of 20 PFAS).
Are PFAS levels rising in Coye-la-Forêt'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 Coye-la-Forêt?
The water hardness in Coye-la-Forêt is 42.7 °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 21 September 2026.
Nearby communes
The closest to Coye-la-Forêt 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=60172
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- COYE LA FORET
Water report for Coye-la-Forêt
Get new PFAS results for Coye-la-Forêt, with a short explanation. At most one update a week, only when there's something new.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.