PFAS in Écommoy's tap water: under 10 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 10 ng/L, 20 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 2 to 4 ng/L upward. None reached that limit, so their total is below 10 ng/L rather than zero.
checked on 1 July 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorododécanoique (PFDoDA) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,004 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,002 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,004 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,002 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,020 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,004 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,010 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,010 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,010 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,002 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,002 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,002 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,004 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,002 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,002 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,004 µg/L |
None found. The lab sees nothing below 10 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Écommoy
Get new PFAS results for Écommoy, 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
- 1 July 2025
- Water supplier
- SIDERM
In Écommoy, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 1 July 2025. The total is below 10 ng/L, the sum of the detection limits and 20 times our 0.5 ng/L benchmark. Sum of 20 PFAS: <SEUIL µg/L, below the EU legal limit (100 ng/L). 2 checks since 13 February 2025, sum of 20 PFAS 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 Écommoy
2 PFAS checks since 13 February 2025, from the published measurements.
“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 |
|---|---|---|
| < 10 ng/L · calculated | < detection limit | |
| < 10 ng/L · calculated | < detection limit |
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: Coliform bacteria 1 n/(100mL) on 23 July 2026 (reference ≤ 0 mL)). These are indicator parameters with reference values, not legal limits.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Coliform bacteria | 1 n/(100mL) | ≤ 0 mL) | above the reference value |
See all 20 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 0.73 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 0.6 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.0239 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 0.9 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <0,2 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | 0.024 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | 0.5 µg/L | ≤ 50 µg/L | within the limit |
| Fluoride | <0,050 mg/L | ≤ 1.5 mg/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) | above the reference value |
| pH | 7.1 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 19.3 °f | no limit | for reference |
| Electrical conductivity | 379 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 10.7 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 27.2 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 6.3 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 3 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,30 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Écommoy safe to drink?
Yes. At the check on 23 July 2026, the tap water in Écommoy was within every limit tested. Outside a reference value: Coliform bacteria 1 n/(100mL) on 23 July 2026 (reference ≤ 0 mL)). These are indicator parameters with reference values, not legal limits. “Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité concernant la présence d'un coliforme.”
How high are PFAS levels in Écommoy's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at –. The EU limit is 100 ng/L, so this water is at – of the limit. (below the EU limit)
Does the water in Écommoy 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 10 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 Écommoy's tap water?
Calculated PFAS-4 values are listed in the table. The chart uses laboratory-published sum-of-20 results; there are too few laboratory-published PFAS-4 sums for the existing trend calculation.
How hard is the water in Écommoy?
The water hardness in Écommoy is 19.3 °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 Écommoy, so in principle the same water.
Nearby communes
The closest to Écommoy 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=72124
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- SIDERM ECOMMOY
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.