PFAS in Limonest's tap water: 10 ng/L, 20x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
20× 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 Lyon, on the same distribution network as Limonest (CENTRE (METROPOLE LYON)). 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.
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 96% of the cities we track
checked on 16 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | 0.005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | 0.003 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.002 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.002 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 17 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 16 July 2026
- Water supplier
- EAU DU GRAND LYON
In Limonest, the 4 most closely watched PFAS (PFAS-4) add up to 10 ng/L (0.01 µg/L) at the latest PFAS check on 16 July 2026. That's 20 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 17 ng/L (0.017 µg/L), below the EU legal limit (100 ng/L). Sampled in Lyon, on the same network. 16 checks since 16 October 2025: PFAS-4 from 4 ng/L to 17 ng/L, averaging 10.06 ng/L over 12 months. No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Limonest
40 PFAS checks since 28 February 2023, from the published measurements. Samples from 6 communes on the same network: it's the same water, so each one applies to Limonest.
“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 |
|---|---|---|---|
| 10 ng/L | 17 ng/L | Lyon | |
| 8 ng/L | 11 ng/L | Lyon | |
| 14 ng/L | 25 ng/L | Villeurbanne | |
| 6 ng/L | 8 ng/L | Villeurbanne | |
| 10 ng/L | 17 ng/L | Bron | |
| 10 ng/L | 16 ng/L | Lyon | |
| 11 ng/L | 18 ng/L | Lyon | |
| 8 ng/L | 11 ng/L | Vaulx-en-Velin | |
| 11 ng/L | 21 ng/L | Villeurbanne | |
| 8 ng/L | 14 ng/L | Lyon | |
| 7 ng/L | 12 ng/L | Lyon | |
| 4 ng/L | 6 ng/L | Rillieux-la-Pape |
Show the 28 earlier checks (back to 28 February 2023)
| 14 ng/L | 35 ng/L | Oullins-Pierre-Bénite | |
| 17 ng/L | 40 ng/L | Rillieux-la-Pape | |
| 12 ng/L | 20 ng/L | Villeurbanne | |
| 11 ng/L | 20 ng/L | Villeurbanne | |
| 7 ng/L – < 8 ng/L · calculated | 9 ng/L | Rillieux-la-Pape | |
| 14 ng/L – < 15 ng/L · calculated | 24 ng/L | Villeurbanne | |
| 9 ng/L – < 10 ng/L · calculated | 15 ng/L | Villeurbanne | |
| 5 ng/L – < 6 ng/L · calculated | 16 ng/L | Rillieux-la-Pape | |
| 16 ng/L – < 17 ng/L · calculated | 39 ng/L | Villeurbanne | |
| 9 ng/L – < 10 ng/L · calculated | 16 ng/L | Villeurbanne | |
| 14 ng/L – < 15 ng/L · calculated | 28 ng/L | Villeurbanne | |
| 8 ng/L – < 9 ng/L · calculated | 12 ng/L | Rillieux-la-Pape | |
| 24 ng/L – < 25 ng/L · calculated | 40 ng/L | Villeurbanne | |
| < 4 ng/L · calculated | 1 ng/L | Rillieux-la-Pape | |
| 9.5 ng/L – < 10.5 ng/L · calculated | 13.1 ng/L | Villeurbanne | |
| 10.4 ng/L – < 16.4 ng/L · calculated | 16.9 ng/L | Villeurbanne | |
| 7.6 ng/L – < 8.6 ng/L · calculated | 16 ng/L | Villeurbanne | |
| < 4 ng/L · calculated | < 1 ng/L | Rillieux-la-Pape | |
| 9.6 ng/L – < 10.6 ng/L · calculated | 20.1 ng/L | Villeurbanne | |
| 5.8 ng/L – < 6.8 ng/L · calculated | 9.6 ng/L | Rillieux-la-Pape | |
| 9.2 ng/L – < 10.2 ng/L · calculated | 14.8 ng/L | Villeurbanne | |
| 9.2 ng/L – < 10.2 ng/L · calculated | 15 ng/L | Villeurbanne | |
| 4.2 ng/L – < 6.2 ng/L · calculated | 4.2 ng/L | Rillieux-la-Pape | |
| 39.8 ng/L – < 40.8 ng/L · calculated | 57.2 ng/L | Villeurbanne | |
| 6.7 ng/L – < 7.7 ng/L · calculated | 11.4 ng/L | Villeurbanne | |
| 4.4 ng/L – < 14.4 ng/L · calculated | 6.4 ng/L | Rillieux-la-Pape | |
| 10.6 ng/L – < 20.6 ng/L · calculated | 22.2 ng/L | Villeurbanne | |
| 9.8 ng/L – < 19.8 ng/L · calculated | 22.5 ng/L | Villeurbanne |
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.
Values to watch
These results are close to their legal limit, or over it.
Outside a reference value: Iron 525 µg/L on 10 March 2025 (reference ≤ 200 µg/L). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Iron | 525 µg/L | ≤ 200 µg/L | above the reference value |
See all 14 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 3.4 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 | 7.4 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 18.57 °f | no limit | for reference |
| Electrical conductivity | 357 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 11 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 36.1 mg/L | ≤ 250 mg/L | within the limit |
| Iron | 525 µg/L | ≤ 200 µg/L | above the reference value |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Limonest safe to drink?
Yes. At the check on 22 July 2026, the tap water in Limonest was within every limit tested. Outside a reference value: Iron 525 µg/L on 10 March 2025 (reference ≤ 200 µg/L). These are indicator parameters with reference values, not legal limits. “Eau d'alimentation conforme aux exigences de qualité en vigueur pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Limonest's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 17 ng/L. The EU limit is 100 ng/L, so this water is at 17 % of the limit. (below the EU limit)
Does the water in Limonest also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 10 ng/L. That is 2.5 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 Limonest's tap water?
No clear trend. Since 28 February 2023, 16 checks have been published; on the main network the PFAS-4 sum ranged between 4 ng/L and 17 ng/L (16 quantified values), at times below the detection limit. pfasnearme only reports a trend from a change of at least 25 % and 1 ng/L. These history statistics use laboratory-published sums only.
How hard is the water in Limonest?
The water hardness in Limonest is 18.6 °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 Limonest, so in principle the same water.
Nearby communes
The closest to Limonest 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=69116
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- CENTRE (METROPOLE LYON)
Water report for Limonest
Get new PFAS results for Limonest, 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.