Drinking water quality in Poissy
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.095 µg/L. The EU limit is 0.1 µg/L, so this water is at 95 % of the limit. (11 February 2026)
The four most harmful PFAS add up to 0.062 µg/L. That is 15.5 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.
13 PFAS (see each substance)
| Perfluorohexane sulfonate (PFHXS) | 0.049 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.009 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.008 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.008 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.005 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
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Official assessment
The latest official test passed all quality requirements.
„Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.“
Values to watch
These values are at least halfway to their legal limit, or over it.
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 29.2 mg/L | ≤ 50 mg/L | within limit |
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 29.2 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within limit |
| Lead | <2 µg/L | ≤ 10 µg/L | within limit |
| Copper | 0.042 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 | N.M. µg/L | ≤ 6 µg/L | not assessed |
| Uranium | <10 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.23 mg/L | ≤ 1.5 mg/L | within limit |
| Escherichia coli | <1 n/(100mL) | ≤ 0 mL) | within limit |
| Enterococci | <1 n/(100mL) | ≤ 0 mL) | within limit |
| Coliform bacteria | <1 n/(100mL) | ≤ 0 mL) | within limit |
| pH | 7.94 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 18.53 °f | no limit | informational |
| Electrical conductivity | 706 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 42.6 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 68 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 71.6 mg/L | ≤ 200 mg/L | within limit |
| Iron | 18 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | 0.7 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Poissy safe to drink?
Yes. The latest official test (25 June 2026) checked the tap water in Poissy and it passed every requirement.
How high are PFAS levels in Poissy's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.095 µg/L. The EU limit is 0.1 µg/L, so this water is at 95 % of the limit. (below the EU limit)
Does the water in Poissy also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 0.062 µg/L. That is 15.5 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 Poissy?
The water hardness in Poissy is 18.53 °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=78498
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- POISSY
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.