Drinking water quality in Osny
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.017 µg/L. The EU limit is 0.1 µg/L, so this water is at 17 % of the limit. (19 March 2026)
The four most harmful PFAS add up to 0.009 µg/L. That is 2.3 times the health limit of 0.004 µg/L that Sweden made law in 2026. Germany will set a similar limit in 2028.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
Substances too small to measure count as 0, so the real total may be higher.
20 PFAS (see each substance)
| Acide sulfonique de perfluorooctane (PFOS) | 0.004 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.003 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.003 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <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 perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
Water report for Osny
Get the free water report for Osny, plus an alert whenever new official results are published.
Official assessment
The authorities have not published an overall verdict for this water.
„Teneur en perchlorates respectant le seuil de 4µg/L préconisé par la D irection Générale de la Santé pour la protection des nourrissons de mo ins de 6 mois.“
Values to watch
These values are at least halfway to their legal limit, or over it.
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 25.4 mg/L | ≤ 50 mg/L | within limit |
| Lead | 5 µg/L | ≤ 10 µg/L | within limit |
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 25.4 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.1 mg/L | within limit |
| Lead | 5 µg/L | ≤ 10 µg/L | within limit |
| Copper | 0.227 mg(Cu)/L | ≤ 2 mg(Cu)/L | within limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within limit |
| Arsenic | <2 µg/L | ≤ 10 µg/L | within limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within limit |
| Chromium | <5,00 µg/L | ≤ 50 µg/L | within limit |
| Uranium | <10 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.11 mg/L | ≤ 1.5 mg/L | within limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within limit |
| pH | 7.5 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 28.13 °f | no limit | informational |
| Electrical conductivity | 629 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 27.2 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 49.6 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 14.4 mg/L | ≤ 200 mg/L | within limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | 0.16 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Osny safe to drink?
All the values shown here (20 March 2026) are within the legal limits, but the authorities have not published an overall verdict for this water.
How high are PFAS levels in Osny's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.017 µg/L. The EU limit is 0.1 µg/L, so this water is at 17 % of the limit. (below the EU limit)
Does the water in Osny also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 0.009 µg/L. That is 2.3 times the health limit of 0.004 µg/L that Sweden made law in 2026. The water still passes the current EU limit (0.1 µg/L for the total of 20 PFAS).
How hard is the water in Osny?
The water hardness in Osny is 28.13 °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 28 August 2026.
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=95476
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- OSNY PIGEONNIER, CACP NORD, COM. D'AGGLOMERATION CENTRE, COM. D'AGGLOMERATION BOUCLE NORD
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.