PFAS in La Chapelle-Onzerain's tap water: 9 ng/L, 18x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
18× 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 95% of the cities we track
checked on 24 April 2025
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoro-octanoïque (PFOA) | 0.009 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.001 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoropentanoïque (PFPEA) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
Fails a current legal limit. Here are some filter options.
- EU legal limit
- 10 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 24 April 2025
- Water supplier
- COMMUNAUTÉ DE COMMUNES DE LA BEAUCE LOIRETAINE
In La Chapelle-Onzerain, the 4 most closely watched PFAS (PFAS-4) add up to 9 ng/L (0.009 µg/L) at the latest PFAS check on 24 April 2025. That's 18 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 10 ng/L (0.01 µg/L), below the EU legal limit (100 ng/L). 2 checks since 7 January 2025: sum of 20 PFAS from 8 ng/L to 10 ng/L. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).
Details and sources
PFAS over time in La Chapelle-Onzerain
2 PFAS checks since 7 January 2025, from the published measurements. Samples from 2 communes on the same network: it's the same water, so each one applies to La Chapelle-Onzerain. Samples come from 2 distribution networks. The trend refers to the network “LA CHAPELLE ONZERAIN (ABA)”.
“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 |
|---|---|---|---|---|
| 9 ng/L – < 12 ng/L · calculated | 10 ng/L | La Chapelle-Onzerain | LA CHAPELLE ONZERAIN (ABA), LA CHAPELLE ONZERAIN (ABA) | |
| 3 ng/L – < 5 ng/L · calculated | 8 ng/L | Saint-Péravy-la-Colombe | ST PERAVY LA COLOMBE - TOURNOISIS - LA CHAPELLE ONZERAIN , ST PERAVY LA COLOMBE - TOURNOISIS - LA CHAPELLE ONZERAIN |
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 over at least one limit.
Values to watch
These results are close to their legal limit, or over it.
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 37.4 mg/L | ≤ 50 mg/L | within the limit |
| Arsenic | 5.4 µg/L | ≤ 10 µg/L | within the limit |
See all 19 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 37.4 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,01 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | <2 µg/L | ≤ 10 µg/L | within the limit |
| Nickel | <5 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 5.4 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <1 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | <5 µg/L | ≤ 50 µg/L | within the limit |
| Fluoride | 0.08 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 | 7.7 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 29.61 °f | no limit | for reference |
| Electrical conductivity | 589 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 24.3 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 26.9 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 7.7 mg/L | ≤ 200 mg/L | within the limit |
| Iron | <10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,10 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in La Chapelle-Onzerain safe to drink?
At the latest check, the water was over at least one limit. “Ce prélèvement a mis en évidence une teneur non conforme en atrazine déséthyl déisopropyl et la présence d'autres pesticides qui nécessitent que vous preniez des mesures correctives afin de rétablir la qualité de l'eau et m'en informiez ainsi que les consommateurs (art. R.1321-27 à 30 du code de la santé publique). Cette non-conformité ne nécessite cependant pas de restriction de consommation de l’eau. Les autres paramètres mesurés sont conformes aux exigences de qualité.”
How high are PFAS levels in La Chapelle-Onzerain's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 10 ng/L. The EU limit is 100 ng/L, so this water is at 10 % of the limit. (below the EU limit)
Does the water in La Chapelle-Onzerain also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 9 ng/L. That is 2.3 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 La Chapelle-Onzerain'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 La Chapelle-Onzerain?
The water hardness in La Chapelle-Onzerain is 29.6 °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 La Chapelle-Onzerain, so in principle the same water.
Nearby communes
The closest to La Chapelle-Onzerain 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=45074
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 12 September 2026
- Supply networks
- LA CHAPELLE ONZERAIN (ABA), ST PERAVY LA COLOMBE - TOURNOISIS - LA CHAPELLE ONZERAIN
Water report for La Chapelle-Onzerain
Get new PFAS results for La Chapelle-Onzerain, 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.