PFAS in Castelnou's tap water: under 24 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
No PFAS detected
The lab sees nothing below 24 ng/L, 48 times our benchmark of 0.5 ng/L. Water above our benchmark would pass this check unnoticed.
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 Thuir, on the same distribution network as Castelnou (ASPRES RIPOLL). 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.
The lab detects each of the four substances from 2 to 10 ng/L upward. None reached that limit, so their total is below 24 ng/L rather than zero.
checked on 21 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide sulfonique de perfluorooctane (PFOS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,010 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,010 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,010 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,010 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,010 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,010 µg/L |
None found. The lab sees nothing below 24 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Castelnou
Get new PFAS results for Castelnou, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- none detected sum of 20 PFAS below the detection limit, limit 100 ng/L
- Last PFAS test
- 21 July 2026
- Water supplier
- SAUR
In Castelnou, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 21 July 2026. The total is below 24 ng/L, the sum of the detection limits and 48 times our 0.5 ng/L benchmark. Sum of 20 PFAS: <0,002 µg/L, below the EU legal limit (100 ng/L). Sampled in Thuir, on the same network. 2 checks since 13 May 2026, PFAS-4 always below the detection limit (2 ng/L). Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Castelnou
3 PFAS checks since 7 July 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Castelnou. Samples come from 2 distribution networks. The trend refers to the network “ASPRES CAUSSE”.
“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 | Thuir | ASPRES RIPOLL | |
| < 2 ng/L | < 2 ng/L | Terrats | ASPRES CAUSSE | |
| < 24 ng/L · calculated | < 2 ng/L | Thuir | ASPRES CAUSSE |
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 17 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 4.6 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,020 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <0,50 µg/L | ≤ 10 µg/L | within the limit |
| Copper | <0,0050 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <0,50 µg/L | ≤ 20 µg/L | within the limit |
| Cadmium | <0,50 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <0,50 µg/L | ≤ 50 µg/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 | 7.9 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 21.4 °f | no limit | for reference |
| Electrical conductivity | 504 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 13.9 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 24.3 mg/L | ≤ 250 mg/L | within the limit |
| Iron | <5,00 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.18 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Castelnou safe to drink?
Yes. At the check on 21 July 2026, the tap water in Castelnou was within every limit tested. “Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité.”
How high are PFAS levels in Castelnou's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 2 ng/L. The EU limit is 100 ng/L, so this water is under 2 % of the limit. (below the EU limit)
Does the water in Castelnou also meet the strictest limits in Europe?
The check cannot say. None of the four compounds was quantified, but the laboratory's detection limits add up to 24 ng/L, above Sweden's legal limit of 4 ng/L in force since 2026, so a value between the two would go unnoticed.
Are PFAS levels rising in Castelnou's tap water?
Too few quantified checks to say (0 since 7 July 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 Castelnou?
The water hardness in Castelnou is 21.4 °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 Castelnou, so in principle the same water.
Nearby communes
The closest to Castelnou 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=66044
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- ASPRES CAUSSE, ASPRES RIPOLL
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.