PFAS in Guéreins's tap water: 9 ng/L, 18x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
18× 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 95% of the cities we track
checked on 27 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | 0.018 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.014 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.007 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.006 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.004 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.003 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 55 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 27 July 2026
- Water supplier
- SUEZ EAU FRANCE - ARA
In Guéreins, the 4 most closely watched PFAS (PFAS-4) add up to 9 ng/L (0.009 µg/L) at the latest PFAS check on 27 July 2026. That's 18 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 55 ng/L (0.055 µg/L), below the EU legal limit (100 ng/L). 24 checks since 5 August 2025: PFAS-4 from 7 ng/L to 20 ng/L, averaging 11.58 ng/L over 12 months. Falling on the main network. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Guéreins
31 PFAS checks since 18 April 2025, from the published measurements.
“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 |
|---|---|---|
| 9 ng/L | 55 ng/L | |
| 13 ng/L | 61 ng/L | |
| 11 ng/L | 53 ng/L | |
| 12 ng/L | 58 ng/L | |
| 9 ng/L | 59 ng/L | |
| 9 ng/L | 53 ng/L | |
| 9 ng/L | 51 ng/L | |
| 10 ng/L | 54 ng/L | |
| 9 ng/L | 46 ng/L | |
| 10 ng/L | 58 ng/L | |
| 9 ng/L | 35 ng/L | |
| 16 ng/L | 58 ng/L |
Show the 19 earlier checks (back to 18 April 2025)
| 11 ng/L | 57 ng/L | |
| 9 ng/L | 43 ng/L | |
| 12 ng/L | 60 ng/L | |
| 10 ng/L | 48 ng/L | |
| 10 ng/L | 60 ng/L | |
| 7 ng/L | 53 ng/L | |
| 10 ng/L | 43 ng/L | |
| 13 ng/L | 54 ng/L | |
| 20 ng/L | 153 ng/L | |
| 15 ng/L | 125 ng/L | |
| 16 ng/L | 135 ng/L | |
| 19 ng/L | 140 ng/L | |
| 16 ng/L – < 17 ng/L · calculated | 149 ng/L | |
| 14 ng/L – < 15 ng/L · calculated | 109 ng/L | |
| 12 ng/L – < 13 ng/L · calculated | 103 ng/L | |
| 12 ng/L – < 13 ng/L · calculated | 117 ng/L | |
| 13 ng/L – < 14 ng/L · calculated | 130 ng/L | |
| 9 ng/L – < 10 ng/L · calculated | 112 ng/L | |
| 11 ng/L – < 12 ng/L · calculated | 126 ng/L |
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
The authorities have not published an overall verdict for this water.
See all 20 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 12.6 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <2 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.04 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <2 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <5 µg/L | ≤ 50 µg/L | within the limit |
| Fluoride | 0.14 mg/L | ≤ 1.5 mg/L | within the limit |
| Escherichia coli | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| Enterococci | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| Coliform bacteria | <1 n/(100mL) | ≤ 0 mL) | within the limit |
| pH | 7.5 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 25.4 °f | no limit | for reference |
| Electrical conductivity | 563 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 22.2 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 26.6 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 14.6 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.12 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Guéreins safe to drink?
All the values shown here (27 July 2026) are within the legal limits, but 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.”
How high are PFAS levels in Guéreins's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 55 ng/L. The EU limit is 100 ng/L, so this water is at 55 % of the limit. (below the EU limit)
Does the water in Guéreins also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 9 ng/L. That is 2.3 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 Guéreins's tap water?
No, they are falling. On the main network, the PFAS-4 sum went from 19 ng/L (5 August 2025) to 9 ng/L (27 July 2026) across 24 quantified checks. These history statistics use laboratory-published sums only.
How hard is the water in Guéreins?
The water hardness in Guéreins is 25.4 °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 21 September 2026.
Same water network
Same distribution network as Guéreins, so in principle the same water.
Nearby communes
The closest to Guéreins 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=01183
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- BDS MONTMERLE ET ENVIRONS
Water report for Guéreins
Get new PFAS results for Guéreins, 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.