Drinking water quality in Guichen
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.0098 µg/L. The EU limit is 0.1 µg/L, so this water is at 10 % of the limit. (11 February 2026)
The four most harmful PFAS add up to 0.0008 µg/L, below the health limit of 0.004 µg/L used in Sweden since 2026.
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 perfluoropentanoïque (PFPEA) | 0.0061 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0025 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.0008 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.0004 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,00040 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,00040 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,0010 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,00040 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,0010 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,0050 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,00040 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,00040 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0010 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,0010 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0010 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0010 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0010 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,00040 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0010 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,00040 µg/L |
Water report for Guichen
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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.“
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 19.2 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,02 mg/L | ≤ 0.5 mg/L | within limit |
| Lead | <1,0 µg/L | ≤ 10 µg/L | within limit |
| Copper | <0,0010 mg(Cu)/L | ≤ 2 mg(Cu)/L | within limit |
| Nickel | 1.7 µg/L | ≤ 20 µg/L | within limit |
| Arsenic | <0,20 µg/L | ≤ 10 µg/L | within limit |
| Cadmium | <0,025 µg/L | ≤ 5 µg/L | within limit |
| Chromium | <1,0 µg/L | ≤ 50 µg/L | within limit |
| Uranium | <0,50 µg/L | ≤ 30 µg/L | within limit |
| Fluoride | 0.093 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 | 7.7 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 18.1 °f | no limit | informational |
| Electrical conductivity | 585 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 51 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 58.4 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 22.5 mg/L | ≤ 200 mg/L | within limit |
| Iron | <20 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | <0,20 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Guichen safe to drink?
Yes. The latest official test (29 June 2026) checked the tap water in Guichen and it passed every requirement.
How high are PFAS levels in Guichen's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.0098 µg/L. The EU limit is 0.1 µg/L, so this water is at 10 % of the limit. (below the EU limit)
Does the water in Guichen also meet the strictest limits in Europe?
Yes. Even against Europe's strictest limit, the health limit of 0.004 µg/L used in Sweden since 2026, the measured value of 0.0008 µg/L stays below.
How hard is the water in Guichen?
The water hardness in Guichen is 18.1 °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=35126
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- CEBR_CHAMP FLEURY_BRUZ, BRUYERES_FRAUX/PORT DE ROCHE/CHAMP FLEURY_GUICHEN, BRUYERES_FRAUX/PORT DE ROCHE_BOURG DES COMPTES
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.