PFAS in Coësmes's tap water: under 3.4 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 3.4 ng/L, 6.8 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 Retiers, on the same distribution network as Coësmes (FORET THEIL_CITE_RETIERS). 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 0.4 to 1 ng/L upward. None reached that limit, so their total is below 3.4 ng/L rather than zero.
checked on 7 April 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluorohexanoïque (PFHXA) | 0.0017 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0010 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,00040 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,00040 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0010 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,00040 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,0010 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,00040 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,00040 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,00040 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0010 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,0050 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,0010 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,00040 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,00040 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,0010 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,0010 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,00040 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0010 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,0050 µg/L |
None found. The lab sees nothing below 3.4 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Coësmes
Get new PFAS results for Coësmes, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 1.7 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 7 April 2026
- Water supplier
- AQUALIA
In Coësmes, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 7 April 2026. The total is below 3.4 ng/L, the sum of the detection limits and 6.8 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 1.7 ng/L (0.0017 µg/L), below the EU legal limit (100 ng/L). Sampled in Retiers, on the same network. 2 checks since 17 November 2025, 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 Coësmes
3 PFAS checks since 18 February 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Coësmes.
“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 |
|---|---|---|---|
| < detection limit | 1.7 ng/L | Retiers | |
| < detection limit | < detection limit | Le Theil-de-Bretagne | |
| < 3.4 ng/L · calculated | < detection limit | Le Theil-de-Bretagne |
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 | 16.3 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,02 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <1,0 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.055 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 5.5 µg/L | ≤ 20 µg/L | within the limit |
| Cadmium | 0.09 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <1,0 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 | 8.1 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 21.2 °f | no limit | for reference |
| Electrical conductivity | 566 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 48.7 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 109 mg/L | ≤ 250 mg/L | within the limit |
| Iron | <20 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,20 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Coësmes safe to drink?
Yes. At the check on 7 April 2026, the tap water in Coësmes 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 Coësmes's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 1.7 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 Coësmes 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 3.4 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 Coësmes's tap water?
Too few quantified checks to say (0 since 18 February 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 Coësmes?
The water hardness in Coësmes is 21.2 °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 Coësmes, so in principle the same water.
Nearby communes
The closest to Coësmes 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=35082
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- FORET THEIL_CITE_RETIERS
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.