PFAS in Messimy's tap water: 25 ng/L, 50x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
50× 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.
Sample taken in Chevinay, on the same distribution network as Messimy (YZERON BOURG). The health authority samples one tap per network; a network carries the same treated water everywhere.
More about this result
The US also limits PFOA and PFOS to 4 ng/L each, per substance.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 99% of the cities we track
checked on 3 June 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorohexanoïque (PFHXA) | 0.015 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.013 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.01 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.009 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.008 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.006 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.005 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | 0.001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 69 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 3 June 2026
- Water supplier
- SUEZ LYONNAISE DES EAUX 69
In Messimy, the 4 most closely watched PFAS (PFAS-4) add up to 25 ng/L (0.025 µg/L) at the latest PFAS check on 3 June 2026. That's 50 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 69 ng/L (0.069 µg/L), below the EU legal limit (100 ng/L). Sampled in Chevinay, on the same network. 6 checks since 14 October 2025: PFAS-4 from 21 ng/L to 32 ng/L, averaging 25.6 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 Messimy
32 PFAS checks since 3 March 2023, from the published measurements. Samples from 11 communes on the same network: it's the same water, so each one applies to Messimy. Samples come from 2 distribution networks. The trend refers to the network “SUD OUEST LYONNAIS”.
“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 |
|---|---|---|---|---|
| 25 ng/L | 69 ng/L | Chevinay | YZERON BOURG | |
| 21 ng/L | 71 ng/L | Chaponost | SUD OUEST LYONNAIS, YZERON BOURG | |
| 25 ng/L | 89 ng/L | Grézieu-la-Varenne | SUD OUEST LYONNAIS, YZERON BOURG | |
| 24 ng/L | 85 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 26 ng/L | 89 ng/L | Brindas | SUD OUEST LYONNAIS, YZERON BOURG | |
| 32 ng/L | 105 ng/L | Brindas | SUD OUEST LYONNAIS, YZERON BOURG | |
| 27 ng/L · calculated | 86 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 26 ng/L – < 27 ng/L · calculated | 84 ng/L | Grézieu-la-Varenne | SUD OUEST LYONNAIS, YZERON BOURG | |
| 18 ng/L – < 19 ng/L · calculated | 93 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 30 ng/L – < 31 ng/L · calculated | 108 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 29 ng/L · calculated | 69 ng/L | Vaugneray | SUD OUEST LYONNAIS, YZERON BOURG | |
| 22 ng/L – < 23 ng/L · calculated | 76 ng/L | Brignais | SUD OUEST LYONNAIS |
Show the 20 earlier checks (back to 3 March 2023)
| 28 ng/L – < 29 ng/L · calculated | 98 ng/L | Soucieu-en-Jarrest | SUD OUEST LYONNAIS, YZERON BOURG | |
| 27 ng/L – < 28 ng/L · calculated | 84 ng/L | Thurins | SUD OUEST LYONNAIS, YZERON BOURG | |
| 30 ng/L – < 31 ng/L · calculated | 89 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 30 ng/L · calculated | 95 ng/L | Sainte-Consorce | SUD OUEST LYONNAIS, YZERON BOURG | |
| 27 ng/L – < 28 ng/L · calculated | 89 ng/L | Vaugneray | SUD OUEST LYONNAIS, YZERON BOURG | |
| 1 ng/L – < 4 ng/L · calculated | 1 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 29.8 ng/L – < 34.8 ng/L · calculated | 99.9 ng/L | Brignais | SUD OUEST LYONNAIS, YZERON BOURG | |
| 31.8 ng/L – < 32.8 ng/L · calculated | 100.2 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 24.3 ng/L – < 25.3 ng/L · calculated | 88.9 ng/L | Pollionnay | SUD OUEST LYONNAIS, YZERON BOURG | |
| 27 ng/L · calculated | 89.3 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 31.2 ng/L · calculated | 105.5 ng/L | Chaponost | SUD OUEST LYONNAIS, YZERON BOURG | |
| 45.3 ng/L · calculated | 156.1 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 28.5 ng/L – < 29.5 ng/L · calculated | 83 ng/L | Vaugneray | SUD OUEST LYONNAIS, YZERON BOURG | |
| 25 ng/L · calculated | 97.5 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 12.8 ng/L – < 13.8 ng/L · calculated | 42.4 ng/L | Soucieu-en-Jarrest | SUD OUEST LYONNAIS, YZERON BOURG | |
| 38.2 ng/L · calculated | 154.7 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 30.7 ng/L · calculated | 140.9 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 28.5 ng/L · calculated | 121.4 ng/L | Messimy | SUD OUEST LYONNAIS, YZERON BOURG | |
| 29.5 ng/L – < 34.5 ng/L · calculated | 127.5 ng/L | Brignais | SUD OUEST LYONNAIS | |
| 29.7 ng/L – < 34.7 ng/L · calculated | 101.7 ng/L | Grézieu-la-Varenne | SUD OUEST LYONNAIS, YZERON BOURG |
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 14 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 22 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | 0.01 mg/L | ≤ 0.5 mg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <5 µg/L | ≤ 50 µg/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 | 7.3 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 32.32 °f | no limit | for reference |
| Electrical conductivity | 704 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 41.5 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 51 mg/L | ≤ 250 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Messimy safe to drink?
Yes. At the check on 3 June 2026, the tap water in Messimy was within every limit tested. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Messimy's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 69 ng/L. The EU limit is 100 ng/L, so this water is at 69 % of the limit. (below the EU limit)
Does the water in Messimy also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 25 ng/L. That is 6.3 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 Messimy's tap water?
No, they are falling. On the main network, the PFAS-4 sum went from 32 ng/L (14 October 2025) to 21 ng/L (5 May 2026) across 5 quantified checks. These history statistics use laboratory-published sums only.
How hard is the water in Messimy?
The water hardness in Messimy is 32.3 °f (hard). 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 Messimy, so in principle the same water.
Nearby communes
The closest to Messimy 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=69131
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- SUD OUEST LYONNAIS, YZERON BOURG
Water report for Messimy
Get new PFAS results for Messimy, 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.