Drinking water quality in Les Ulis
PFAS in drinking water
No PFAS results have been published for Les Ulis yet. Testing has been required across the EU since January 2026. We will show the values here as soon as they come out.
"Not published" does not mean "not present". Without test results, no one can say how much PFAS is in this water.
Water report for Les Ulis
Get the free water report for Les Ulis, plus an alert whenever new official results are published.
Official assessment
The latest official test passed all quality requirements.
„Eau conforme pour tous les paramètres à l'exception de la température, qui est légèrement supérieure à la norme. Lors de ce phénomène saisonnier, le gestionnaire doit être vigilant sur le taux de chlore afin d'éviter la prolifération microbienne sur le réseau.“
Show all 13 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 21 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within limit |
| Chromium | <5 µg/L | ≤ 50 µg/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 | 7.5 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 25.8 °f | no limit | informational |
| Electrical conductivity | 564 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 29.7 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 59.4 mg/L | ≤ 250 mg/L | within limit |
| Iron | <20,0 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | <0,10 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Les Ulis safe to drink?
Yes. The latest official test (18 June 2026) checked the tap water in Les Ulis and it passed every requirement.
How high are PFAS levels in Les Ulis's drinking water?
No PFAS results have been published for Les Ulis yet. Testing has been required across the EU since January 2026. We will show the values here as soon as they come out.
How hard is the water in Les Ulis?
The water hardness in Les Ulis is 25.8 °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=91692
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- PARIS SACLAY TTP SAULX
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.