PFAS in Martrois's tap water: under 2.5 ng/L, none of the four main PFAS detected
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
None of the 4 most harmful PFAS detected
The lab sees nothing below 2.5 ng/L, 5 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.
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 0.5 to 1 ng/L upward. None reached that limit, so their total is below 2.5 ng/L rather than zero.
checked on 21 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoroheptanoïque (PFHPA) | 0.0044 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0022 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.0007 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,0005 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0005 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,0005 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,0005 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
Fails a current legal limit. The details are below.
Water report for Martrois
Get new PFAS results for Martrois, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 7.29 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 21 July 2026
- Water supplier
- MAIRIE DE MARTROIS
In Martrois, 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 2.5 ng/L, the sum of the detection limits and 5 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 7.29 ng/L (0.0073 µg/L), below the EU legal limit (100 ng/L). 2 checks since 30 June 2026, PFAS-4 always below the detection limit. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in Martrois
2 PFAS checks since 30 June 2026, values as published. Samples from 2 communes on the same network: it's the same water, so each one applies to Martrois.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at |
|---|---|---|---|
| < detection limit | 7.29 ng/L | Martrois | |
| < detection limit | < detection limit | Chailly-sur-Armançon |
“<” means not detected, the figure being the detection limit. “–” means not published. Labs have only reported the PFAS-4 sum (SANDRE code 9268) since autumn 2025. How to read a PFAS result
What the latest check found
At the latest check, the water was over at least one limit.
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 0.5 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <3 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.058 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | <2 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <3 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <2 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | <1 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.086 mg/L | ≤ 1.5 mg/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 | 8.6 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 11.5 °f | no limit | for reference |
| Electrical conductivity | 291 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 39.5 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 3.6 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 7.7 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 14 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.7 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Martrois safe to drink?
At the latest check, the water was over at least one limit. “Teneurs en Trihalomthanes (THM) supérieures à la limite de qualité. Leur formation résulte de l’action du chlore sur la matière organique. Des analyses complémentaires sont programmées afin d'évalue r la situation. Eau incrustante, qui aura tendance à entartrer les réseaux (intérieurs et extérieurs). La mise à l'équilibre de l'eau permet de r éduire le risque d'entartrage des conduites.”
How high are PFAS levels in Martrois's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 7.29 ng/L. The EU limit is 100 ng/L, so this water is at 7 % of the limit. (below the EU limit)
Does the water in Martrois 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 2.5 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 Martrois's tap water?
Too few quantified checks to say (0 since 30 June 2026). pfasnearme adds each new publication weekly; a trend needs at least three quantified values.
How hard is the water in Martrois?
The water hardness in Martrois is 11.5 °f (soft). 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.
Nearby communes
The closest to Martrois 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=21392
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- MARTROIS
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.