PFAS in Cherbourg-en-Cotentin's tap water: 26.2 ng/L, 52.4x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
52.4× above our health benchmark
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.
Substances below the detection limit count as 0, so the real total may be higher.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 99% of the cities we track
checked on 30 June 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Perfluorohexane sulfonate (PFHXS) | 0.0172 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.0085 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.0076 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.0075 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.0071 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.0015 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.0015 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.0013 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | 0.0012 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0010 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,0010 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,0020 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,0010 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,0010 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,0020 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0010 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,0010 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 53.4 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 30 June 2026
- Water supplier
- CAC- CHERBOURG EN COTENTIN
In Cherbourg-en-Cotentin, the 4 most closely watched PFAS (PFAS-4) add up to 26.2 ng/L (0.0262 µg/L) at the latest PFAS check on 30 June 2026. That's 52.4 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 53.4 ng/L (0.0534 µg/L), below the EU legal limit (100 ng/L). 67 checks since 17 February 2025: sum of 20 PFAS up to 458.6 ng/L, sometimes 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 Cherbourg-en-Cotentin
67 PFAS checks since 17 February 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to Cherbourg-en-Cotentin. Samples come from 7 distribution networks. The trend refers to the network “ASSELINERIE”.
“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 |
|---|---|---|---|---|
| 26.2 ng/L – < 27.2 ng/L · calculated | 53.4 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | 4.7 ng/L | Cherbourg-en-Cotentin | DIVETTE | |
| 34 ng/L – < 35 ng/L · calculated | 62 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 26.7 ng/L – < 27.7 ng/L · calculated | 56.8 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 2.8 ng/L – < 4.8 ng/L · calculated | 2.8 ng/L | Cherbourg-en-Cotentin | TOURLAVILLE EST | |
| 20.7 ng/L – < 21.7 ng/L · calculated | 42.4 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | TRAISNELLERIE | |
| 8.8 ng/L – < 10.8 ng/L · calculated | 21.8 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 1.2 ng/L – < 4.2 ng/L · calculated | 1.2 ng/L | Cherbourg-en-Cotentin | TOURLAVILLE OUEST | |
| 9.7 ng/L – < 11.7 ng/L · calculated | 21.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | BENECERE | |
| 1.1 ng/L – < 4.1 ng/L · calculated | 4.9 ng/L | Cherbourg-en-Cotentin | DIVETTE |
Show the 55 earlier checks (back to 17 February 2025)
| 3.2 ng/L – < 5.2 ng/L · calculated | 4.6 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 3 ng/L – < 5 ng/L · calculated | 3 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 2.2 ng/L – < 4.2 ng/L · calculated | 2.2 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 1.6 ng/L – < 4.6 ng/L · calculated | 1.6 ng/L | Cherbourg-en-Cotentin | TOURLAVILLE EST | |
| 3.7 ng/L – < 5.7 ng/L · calculated | 3.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 3.1 ng/L – < 5.1 ng/L · calculated | 3.1 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 2.8 ng/L – < 4.8 ng/L · calculated | 2.8 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 3.2 ng/L – < 5.2 ng/L · calculated | 3.2 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 3.7 ng/L – < 5.7 ng/L · calculated | 3.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 4.4 ng/L – < 6.4 ng/L · calculated | 4.4 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | DIVETTE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 4.3 ng/L – < 6.3 ng/L · calculated | 4.3 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 1 ng/L – < 4 ng/L · calculated | 1 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 16 ng/L – < 18 ng/L · calculated | 16 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | ASSELINERIE | |
| 123 ng/L – < 124 ng/L · calculated | 149 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 214.2 ng/L – < 215.2 ng/L · calculated | 256.4 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 124.1 ng/L – < 125.1 ng/L · calculated | 162.3 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 1.1 ng/L – < 4.1 ng/L · calculated | 1.1 ng/L | Cherbourg-en-Cotentin | TOURLAVILLE OUEST | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | DIVETTE | |
| < 4 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | BENECERE | |
| 171.9 ng/L – < 172.9 ng/L · calculated | 221.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 177 ng/L – < 178 ng/L · calculated | 226.6 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 124.7 ng/L – < 125.7 ng/L · calculated | 161.3 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | 4.2 ng/L | Cherbourg-en-Cotentin | DIVETTE | |
| 204.2 ng/L – < 205.2 ng/L · calculated | 260.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 200.8 ng/L – < 201.8 ng/L · calculated | 258.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 209.5 ng/L – < 210.5 ng/L · calculated | 269.8 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 4 ng/L · calculated | < detection limit | Le Mesnil-au-Val | HAMEAU MESNAGE | |
| 247.2 ng/L – < 248.2 ng/L · calculated | 316.2 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 307.1 ng/L – < 310.1 ng/L · calculated | 350.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 174.2 ng/L – < 175.2 ng/L · calculated | 233 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 6 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | TOURLAVILLE EST | |
| 179.1 ng/L – < 180.1 ng/L · calculated | 243.7 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| 388.8 ng/L – < 389.8 ng/L · calculated | 458.6 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 6 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | TOURLAVILLE OUEST | |
| < 6 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | TRAISNELLERIE | |
| < 6 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | BENECERE | |
| 204.8 ng/L – < 205.8 ng/L · calculated | 260.6 ng/L | Cherbourg-en-Cotentin | ASSELINERIE | |
| < 6 ng/L · calculated | < detection limit | Cherbourg-en-Cotentin | DIVETTE |
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.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 28.6 mg/L | ≤ 50 mg/L | within the limit |
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 28.6 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <1 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.022 mg/L | ≤ 2 mg/L | within the limit |
| Nickel | <2 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | <0,25 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,025 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <1,0 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | <0,10 µg/L | ≤ 30 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) | within the limit |
| pH | 8.1 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 13.2 °f | no limit | for reference |
| Electrical conductivity | 339 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 29 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 9 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 16.9 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <1,0 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.4 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Cherbourg-en-Cotentin safe to drink?
Yes. At the check on 8 July 2026, the tap water in Cherbourg-en-Cotentin was within every limit tested. “Eau d'alimentation conforme aux limites et références de qualité pour l'ensemble des paramètres mesurés.”
How high are PFAS levels in Cherbourg-en-Cotentin's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 53.4 ng/L. The EU limit is 100 ng/L, so this water is at 53 % of the limit. (below the EU limit)
Does the water in Cherbourg-en-Cotentin also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 26.2 ng/L. That is 6.6 times Sweden's legal limit of 4 ng/L, in force since 2026. Germany will set a similar one in 2028. The water still passes the current EU legal limit (100 ng/L for the total of 20 PFAS).
Are PFAS levels rising in Cherbourg-en-Cotentin'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 Cherbourg-en-Cotentin?
The water hardness in Cherbourg-en-Cotentin is 13.2 °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.
Same water network
Same distribution network as Cherbourg-en-Cotentin, so in principle the same water.
Nearby communes
The closest to Cherbourg-en-Cotentin 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=50129
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- HAMEAU MESNAGE, DIVETTE, TOURLAVILLE EST, TOURLAVILLE OUEST, TRAISNELLERIE, BENECERE, ASSELINERIE, ACHAT DOUVE ET DIVETTE
Water report for Cherbourg-en-Cotentin
Get new PFAS results for Cherbourg-en-Cotentin, with a short explanation. At most one update a week, only when there's something new.
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.