Drinking water quality in Logonna-Daoulas
PFAS in drinking water
The total of 20 PFAS ("forever chemicals") was last measured at 0.0041 µg/L. The EU limit is 0.1 µg/L, so this water is at 4 % of the limit. (22 April 2025)
The four most harmful PFAS add up to 0.0016 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) | 0.0025 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.0016 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,005 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,005 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,001 µg/L |
Water report for Logonna-Daoulas
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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 | 31 mg/L | ≤ 50 mg/L | within limit |
Show all 17 official measurements
| Parameter | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 31 mg/L | ≤ 50 mg/L | within limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within limit |
| Nickel | 1 µg/L | ≤ 20 µg/L | within limit |
| Arsenic | <1 µg/L | ≤ 10 µg/L | within limit |
| Chromium | <1 µg/L | ≤ 50 µg/L | within limit |
| Fluoride | <0,050 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 | 15 °f | no limit | informational |
| Electrical conductivity | 389 µS/cm | 200–1,100 µS/cm | within limit |
| Chloride | 27.8 mg/L | ≤ 250 mg/L | within limit |
| Sulphate | 20 mg/L | ≤ 250 mg/L | within limit |
| Sodium | 17.2 mg/L | ≤ 200 mg/L | within limit |
| Iron | 6.2 µg/L | ≤ 200 µg/L | within limit |
| Turbidity | 0.24 NFU | ≤ 2 NFU | within limit |
Frequently asked questions
Is tap water in Logonna-Daoulas safe to drink?
Yes. The latest official test (10 June 2026) checked the tap water in Logonna-Daoulas and it passed every requirement.
How high are PFAS levels in Logonna-Daoulas's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 0.0041 µg/L. The EU limit is 0.1 µg/L, so this water is at 4 % of the limit. (below the EU limit)
Does the water in Logonna-Daoulas 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 0.0016 µg/L stays below.
How hard is the water in Logonna-Daoulas?
The water hardness in Logonna-Daoulas is 15 °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=29137
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 August 2026
- Supply networks
- LOGONNA-DAOULAS (TRAON-NEVEZEC)
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.