PFAS in Guerlédan's tap water: 5.4 ng/L, 10.8x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
10.8× above our health benchmark
0.5 ng/L is our benchmark, not an official limit. Same EFSA method as Sweden, Denmark and the Netherlands, but stricter. It's a yearly average, compared here with the latest check.
More about this result
The US also limits PFOA and PFOS to 4 ng/L each, per substance.
Substances below the detection limit count as 0, so the real total may be higher.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 92% of the cities we track
checked on 8 June 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.0054 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,005 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,005 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,005 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 5.4 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 8 June 2026
- Water supplier
- S.T.G.S.
In Guerlédan, the 4 most closely watched PFAS (PFAS-4) add up to 5.4 ng/L (0.0054 µg/L) at the latest PFAS check on 8 June 2026. That's 10.8 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 5.4 ng/L (0.0054 µg/L), below the EU legal limit (100 ng/L). 10 checks since 17 April 2025: PFAS-4 up to 5.4 ng/L, sometimes below the detection limit, averaging at least 1.1 ng/L over 12 months (non-detects as 0). Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Guerlédan
11 PFAS checks since 18 March 2025, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Guerlédan. Samples come from 4 distribution networks. The trend refers to the network “SDC HILVERN PAR KERNE UHEL”.
“Calculated”: PFAS-4 worked out from the four substances in the same sample. The chart, averages and trends use lab-published sums only.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at | Network |
|---|---|---|---|---|
| 5.4 ng/L | 5.4 ng/L | Guerlédan | MUR DE BRETAGNE PAR BOTMINY, MUR DE BRETAGNE PAR KERNE UHEL | |
| 1.2 ng/L | 1.2 ng/L | Guerlédan | MUR DE BRETAGNE PAR BOTMINY, MUR DE BRETAGNE PAR STATIONS | |
| < detection limit | < detection limit | Le Quillio | SDC HILVERN PAR KERNE UHEL | |
| < detection limit | < detection limit | Guerlédan | MUR DE BRETAGNE PAR BOTMINY | |
| < detection limit | < detection limit | Lanrivain | SDC HILVERN PAR KERNE UHEL | |
| < detection limit | < detection limit | Guerlédan | MUR DE BRETAGNE PAR STATIONS | |
| 4.4 ng/L | 4.4 ng/L | Lanrivain | SDC HILVERN PAR KERNE UHEL | |
| < detection limit | < detection limit | Guerlédan | MUR DE BRETAGNE PAR BOTMINY | |
| < detection limit | < detection limit | Lanrivain | SDC HILVERN PAR KERNE UHEL | |
| < detection limit | < detection limit | Guerlédan | MUR DE BRETAGNE PAR STATIONS | |
| < 6 ng/L · calculated | < detection limit | Lanrivain | SDC HILVERN PAR KERNE UHEL |
Calculated values: “<” is an upper bound from published thresholds, “≥” a lower bound, “–” means no published sum or complete measurement. How to read a PFAS result
What the latest check found
At the latest check, the water was within every limit tested.
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | <0,5 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <1 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.011 mg/L | ≤ 2 mg/L | within the limit |
| Nickel | 1.3 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <0,5 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,025 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <0,5 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | <0,5 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.061 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | 0 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 8 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 13 °f | no limit | for reference |
| Electrical conductivity | 383 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 27 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 23 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 16 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <2,5 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.25 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Guerlédan safe to drink?
Yes. At the check on 3 July 2026, the tap water in Guerlédan was within every limit tested. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés. Cependant, les valeurs de chlore mesurées lors de ce contrôle sont élevées. Ceci peut occasionner une gêne importante pour les usagers (objectif souhaitable : 0,1 mg/l de chlore libre en tout point de la distribution).”
How high are PFAS levels in Guerlédan's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 5.4 ng/L. The EU limit is 100 ng/L, so this water is at 5 % of the limit. (below the EU limit)
Does the water in Guerlédan also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 5.4 ng/L. That is 1.35 times Sweden's legal limit of 4 ng/L, in force since 2026. Germany will set a similar one in 2028. The water still passes the current EU legal limit (100 ng/L for the total of 20 PFAS).
Are PFAS levels rising in Guerlédan's tap water?
Too few quantified checks to say (1 since 18 March 2025). pfasnearme adds each new publication weekly; a trend needs at least three quantified values. These history statistics use laboratory-published sums only.
How hard is the water in Guerlédan?
The water hardness in Guerlédan is 13 °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 21 September 2026.
Same water network
Same distribution network as Guerlédan, so in principle the same water.
Nearby communes
The closest to Guerlédan on this site.
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=22158
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- SDC HILVERN PAR KERNE UHEL, MUR DE BRETAGNE PAR BOTMINY, MUR DE BRETAGNE PAR STATIONS, MUR DE BRETAGNE PAR KERNE UHEL
Water report for Guerlédan
Get new PFAS results for Guerlédan, with a short explanation. At most one update a week, only when there's something new.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.