PFAS in Troncens's tap water: under 4 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 4 ng/L, 8 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 Marciac, on the same distribution network as Troncens (MARCIAC). 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 1 ng/L upward. None reached that limit, so their total is below 4 ng/L rather than zero.
checked on 7 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
None found. The lab sees nothing below 4 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Troncens
Get new PFAS results for Troncens, 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
- 7 July 2026
- Water supplier
- SMEPA (SYNDICAT MIXTE DES EAUX DU PARDIAC ARROS)
In Troncens, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 7 July 2026. The total is below 4 ng/L, the sum of the detection limits and 8 times our 0.5 ng/L benchmark. Sum of 20 PFAS: <0,029 µg/L, below the EU legal limit (100 ng/L). Sampled in Marciac, on the same network. 2 checks since 3 April 2026, PFAS-4 always below the detection limit (4 ng/L). Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Troncens
4 PFAS checks since 23 July 2025, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Troncens.
“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 |
|---|---|---|---|
| < 4 ng/L | < 29 ng/L | Marciac | |
| < 4 ng/L | < 29 ng/L | Laveraët | |
| < 4 ng/L · calculated | < 29 ng/L | Montégut-Arros | |
| < 4 ng/L · calculated | < 29 ng/L | Montégut-Arros |
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 9 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Lead | <1 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.01 mg/L | ≤ 2 mg/L | within the limit |
| Nickel | <1 µg/L | ≤ 20 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 | 7.9 unité pH | 6.5–9 unité pH | within the limit |
| Electrical conductivity | 408 µS/cm | 200–1,100 µS/cm | within the limit |
| Turbidity | 0.17 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Troncens safe to drink?
All the values shown here (7 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 Troncens's drinking water?
At the latest check the total of 20 PFAS ("forever chemicals") was below the laboratory's reporting limit of 29 ng/L. The EU limit is 100 ng/L, so this water is under 29 % of the limit. (below the EU limit)
Does the water in Troncens also meet the strictest limits in Europe?
As far as this check can tell, yes. None of the four compounds was quantified, so their total is below 4 ng/L, the sum of the laboratory's detection limits, and under Sweden's legal limit of 4 ng/L in force since 2026.
Are PFAS levels rising in Troncens's tap water?
Too few quantified checks to say (0 since 23 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 Troncens?
No hardness value is available for Troncens in this source.
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 28 September 2026.
Same water network
Same distribution network as Troncens, so in principle the same water.
Nearby communes
The closest to Troncens 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=32455
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 28 September 2026
- Supply networks
- MARCIAC
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.