PFAS in Royas's tap water: 2 ng/L, 4x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
4× 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 Artas, on the same distribution network as Royas (CARLOZ). 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 85% of the cities we track
checked on 20 April 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoro-octanoïque (PFOA) | 0.002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 2 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 20 April 2026
- Water supplier
- CC BIÈVRE ISÈRE
In Royas, the 4 most closely watched PFAS (PFAS-4) add up to 2 ng/L (0.002 µg/L) at the latest PFAS check on 20 April 2026. That's 4 times our 0.5 ng/L health benchmark, but below Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 2 ng/L (0.002 µg/L), below the EU legal limit (100 ng/L). Sampled in Artas, on the same network. 3 checks since 22 September 2025: PFAS-4 from 2 ng/L to 2 ng/L, averaging 2 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 Royas
6 PFAS checks since 20 March 2025, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Royas. Samples come from 2 distribution networks. The trend refers to the network “CARLOZ”.
“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 |
|---|---|---|---|---|
| 2 ng/L | 2 ng/L | Artas | CARLOZ | |
| 2 ng/L | 2 ng/L | Saint-Jean-de-Bournay | CARLOZ | |
| 2 ng/L | 2 ng/L | Saint-Jean-de-Bournay | CARLOZ | |
| 2 ng/L – < 5 ng/L · calculated | 2 ng/L | Saint-Jean-de-Bournay | CARLOZ | |
| < 4 ng/L · calculated | < 28 ng/L | Savas-Mépin | VILLENEUVE MEPIN | |
| < 4 ng/L · calculated | < 100 ng/L | Savas-Mépin | VILLENEUVE MEPIN |
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.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 25.6 mg/L | ≤ 50 mg/L | within the limit |
See all 16 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 25.6 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 4 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.046 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <5 µg/L | ≤ 20 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 |
| 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 | 7.8 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 27.98 °f | no limit | for reference |
| Electrical conductivity | 533 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 10.1 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 9 mg/L | ≤ 250 mg/L | within the limit |
| Turbidity | <0,1 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Royas safe to drink?
Yes. At the check on 1 June 2026, the tap water in Royas 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 Royas's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 2 ng/L. The EU limit is 100 ng/L, so this water is at 2 % of the limit. (below the EU limit)
Does the water in Royas also meet the strictest limits in Europe?
Yes. Even against Europe's strictest legal limit, Sweden's 4 ng/L in force since 2026, the measured value of 2 ng/L stays below.
Are PFAS levels rising in Royas's tap water?
No clear trend. Since 20 March 2025, 3 checks have been published; on the main network the PFAS-4 sum ranged between 2 ng/L and 2 ng/L (3 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 Royas?
The water hardness in Royas is 28 °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 12 September 2026.
Same water network
Same distribution network as Royas, so in principle the same water.
Nearby communes
The closest to Royas 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=38346
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- CARLOZ, VILLENEUVE MEPIN
Water report for Royas
Get new PFAS results for Royas, 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.