Drinking water quality in Cognac
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.055 µg/L. The EU limit is 0.1 µg/L, so this water is at 55 % of the limit. (29 June 2026)
The four most harmful PFAS add up to 0.007 µg/L. That is 1.8 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 perfluoropentane sulfonique (PFPS) | 0.033 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.013 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.007 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | 0.002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,005 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
Water report for Cognac
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Official assessment
The authorities have not published an overall verdict for this water.
„Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.“
Show all 18 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 20.5 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within limit |
| Arsenic | 0.79 µg/L | ≤ 10 µg/L | within limit |
| Cadmium | <0,025 µg/L | ≤ 5 µg/L | within limit |
| Chromium | <0,1 µg/L | ≤ 50 µg/L | within limit |
| Uranium | 0.69 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.12 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 | 7.8 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 27.6 °f | no limit | informational |
| Electrical conductivity | 590 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 27.3 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 25 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 11.9 mg/L | ≤ 200 mg/L | within limit |
| Iron | <1 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Cognac safe to drink?
All the values shown here (29 June 2026) are within the legal limits, but the authorities have not published an overall verdict for this water.
How high are PFAS levels in Cognac's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.055 µg/L. The EU limit is 0.1 µg/L, so this water is at 55 % of the limit. (below the EU limit)
Does the water in Cognac also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 0.007 µg/L. That is 1.8 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 Cognac?
The water hardness in Cognac is 27.6 °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=16102
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- COGNAC
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.