Drinking water quality in Guipry-Messac
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.0071 µg/L. The EU limit is 0.1 µg/L, so this water is at 7 % of the limit. (19 May 2026)
The four most harmful PFAS add up to 0.0061 µg/L. That is 1.5 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.
20 PFAS (see each substance)
| Acide sulfonique de perfluorooctane (PFOS) | 0.0031 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.0019 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.0011 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,0050 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,0010 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,00040 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,00040 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0010 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,0010 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,00040 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,00040 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0010 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,0050 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0010 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0010 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,00040 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,0010 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,00040 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,00040 µg/L |
Water report for Guipry-Messac
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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. Cependant, il convient de signaler la présence de traces de pesticides.“
Show all 21 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 16.3 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 | 0.0019 mg(Cu)/L | ≤ 2 mg(Cu)/L | within limit |
| Nickel | 1.9 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 | 0.079 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 | 8.1 unité pH | 6.5–9 unité pH | within limit |
| Water hardness | 14.7 °f | no limit | informational |
| Electrical conductivity | 384 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 28.5 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 20.3 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 18.7 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 Guipry-Messac safe to drink?
Yes. The latest official test (19 May 2026) checked the tap water in Guipry-Messac and it passed every requirement.
How high are PFAS levels in Guipry-Messac's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.0071 µg/L. The EU limit is 0.1 µg/L, so this water is at 7 % of the limit. (below the EU limit)
Does the water in Guipry-Messac also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 0.0061 µg/L. That is 1.5 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 Guipry-Messac?
The water hardness in Guipry-Messac is 14.7 °f (soft). 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=35176
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- BRUYERES_FRAUX/PORT DE ROCHE_BOURG DES COMPTES, BRUYERES_FRAUX_PIPRIAC, PAYS BAIN_PORT DE ROCHE_BAIN DE BRETAGNE, BRUYERES_FRAUX/PORT DE ROCHE_LOHEAC
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.