pfasnearmeDrinking water quality from official sources

PFAS in La Celle-Saint-Cloud's tap water: 20 ng/L, 40x our 0.5 ng/L benchmark

Last PFAS check: · Source: Hub'eau

PFAS in drinking water

40× above our health benchmark

Amount found in the water 20 ng/L 0.02 µg/L · the 4 most harmful PFAS (PFAS-4)
Our health benchmark 0.5 ng/L

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.

How we chose 0.5 ng/L

Sample taken in Bougival, on the same distribution network as La Celle-Saint-Cloud (BOUGIVAL). The health authority samples one tap per network; a network carries the same treated water everywhere.

More about this result
Legal limit in Sweden (since 2026) over the limit
5× this limit 20 ng/L · Limit: 4 ng/L
Limit in Denmark (since 2021) over the limit
10× this limit 20 ng/L · Limit: 2 ng/L
Limit in Germany (from 2028) no verdict
exactly at this limit 20 ng/L · Limit: 20 ng/L

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 98% of the cities we track

EU legal limit within the limit
48 % of the EU limit 0.048 µg/L · Limit: 0.1 µg/L

checked on 26 June 2026

20 PFAS (see each substance)
PFAS substance Value
Perfluorohexane sulfonate (PFHXS) 0.009 µg/L
Acide sulfonique de perfluorooctane (PFOS) 0.007 µg/L
Acide perfluoropentanoïque (PFPEA) 0.007 µg/L
Acide perfluorobutanoïque (PFBA) 0.006 µg/L
Acide perfluorohexanoïque (PFHXA) 0.006 µg/L
Acide perfluoro-octanoïque (PFOA) 0.004 µg/L
Acide sulfonique de perfluorobutane (PFBS) 0.004 µg/L
Acide perfluoroheptanoïque (PFHPA) 0.003 µg/L
Acide perfluoropentane sulfonique (PFPS) 0.002 µg/L
Acide perfluoro undecane sulfonique (PFUnDS) <0,002 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 perfluorononane sulfonique (PFNS) <0,002 µg/L
Acide perfluoroheptane sulfonique (PFHpS) <0,002 µg/L
Acide perfluorododécanoique (PFDoDA) <0,001 µg/L
Acide perfluoro tridecanoique (PFTrDA) <0,001 µg/L
Acide perfluorododécane sulfonique (PFDoDS) <0,001 µg/L
Acide perfluoro-decanoïque (PFDA) <0,001 µg/L
Acide perfluorodecane sulfonique (PFDS) <0,001 µg/L

Above our health benchmark. Here are some filter options.

EU legal limit
48 ng/L sum of 20 PFAS, below the 100 ng/L limit
Last PFAS test
26 June 2026
Water supplier
S.E.O.P.

In La Celle-Saint-Cloud, the 4 most closely watched PFAS (PFAS-4) add up to 20 ng/L (0.02 µg/L) at the latest PFAS check on 26 June 2026. That's 40 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 48 ng/L (0.048 µg/L), below the EU legal limit (100 ng/L). Sampled in Bougival, on the same network. 13 checks since 14 January 2026: PFAS-4 up to 24 ng/L, sometimes below the detection limit, averaging at least 14.33 ng/L over 12 months (non-detects as 0). No clear trend. Source: Hub'eau, Qualité de l'eau potable (Ministère de la Santé / OFB / BRGM).

Details and sources
Water supplier: S.E.O.P. Latest water check: 26 June 2026 Data updated on

PFAS over time in La Celle-Saint-Cloud

40 PFAS checks since 7 April 2025, from the published measurements. Samples from 5 communes on the same network: it's the same water, so each one applies to La Celle-Saint-Cloud. Samples come from 3 distribution networks. The trend refers to the network “BOUGIVAL”.

“Calculated”: PFAS-4 worked out from the four substances in the same sample. The chart, averages and trends use lab-published sums only.

0.5 ng/L24 ng/L014 January 202626 June 2026
PFAS-4 sum per check in ng/L. Dashed line: pfasnearme's 0.5 ng/L benchmark. Hollow dots: below the detection limit.
DatePFAS-4Sum of 20 PFASSampled atNetwork
20 ng/L48 ng/LBougivalBOUGIVAL
17 ng/L47 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
12 ng/L28 ng/LLouveciennesVERSAILLES
20 ng/L55 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
< 4 ng/L8 ng/LLe PecqBOUGIVAL
< 4 ng/L8 ng/LLe PecqBOUGIVAL
2 ng/L4 ng/LLa Celle-Saint-CloudVERSAILLES
20 ng/L56 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
7 ng/L18 ng/LLe PecqBOUGIVAL
13 ng/L30 ng/LLouveciennesVERSAILLES
24 ng/L66 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
21 ng/L54 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
Show the 28 earlier checks (back to 7 April 2025)
12 ng/L30 ng/LLouveciennesVERSAILLES
7 ng/L – < 8 ng/L · calculated20 ng/LLe PecqBOUGIVAL
14 ng/L – < 15 ng/L · calculated38 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
12 ng/L – < 13 ng/L · calculated30 ng/LLouveciennesVERSAILLES
11 ng/L – < 12 ng/L · calculated29 ng/LLe PecqBOUGIVAL
9 ng/L – < 10 ng/L · calculated22 ng/LLouveciennesVERSAILLES
10 ng/L – < 11 ng/L · calculated34 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
8 ng/L – < 9 ng/L · calculated22 ng/LLe PecqBOUGIVAL
9 ng/L – < 10 ng/L · calculated25 ng/LLouveciennesVERSAILLES
10 ng/L – < 11 ng/L · calculated33 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
8 ng/L – < 9 ng/L · calculated24 ng/LLouveciennesVERSAILLES
15 ng/L – < 16 ng/L · calculated43 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
8 ng/L – < 9 ng/L · calculated26 ng/LLe PecqBOUGIVAL
19 ng/L – < 20 ng/L · calculated52 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
2 ng/L – < 4 ng/L · calculated22 ng/LLe PecqBOUGIVAL
10 ng/L – < 11 ng/L · calculated27 ng/LLouveciennesVERSAILLES
23 ng/L – < 24 ng/L · calculated57 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
6 ng/L – < 7 ng/L · calculated22 ng/LLe PecqBOUGIVAL
8 ng/L – < 9 ng/L · calculated24 ng/LLouveciennesVERSAILLES
8 ng/L – < 9 ng/L · calculated24 ng/LLouveciennesVERSAILLES
24 ng/L – < 25 ng/L · calculated60 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
16 ng/L – < 17 ng/L · calculated47 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD
10 ng/L – < 11 ng/L · calculated24 ng/LLouveciennesVERSAILLES
7 ng/L – < 8 ng/L · calculated21 ng/LLe PecqBOUGIVAL
< 4 ng/L · calculated11 ng/LLe PecqBOUGIVAL
12 ng/L – < 13 ng/L · calculated34 ng/LLouveciennesVERSAILLES
12 ng/L – < 13 ng/L · calculated33 ng/LLouveciennesVERSAILLES
15 ng/L – < 16 ng/L · calculated47 ng/LFlins-sur-SeineBOUGIVAL, LA CELLE SAINT CLOUD NORD

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.

Microbiology: within the limit Chemistry: within the limit
See all 21 test results
What was tested Value Limit Status
Nitrate 16.6 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
Copper 0.093 mg(Cu)/L ≤ 2 mg(Cu)/L within the limit
Nickel <5 µg/L ≤ 20 µg/L within the limit
Arsenic <2 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
Uranium <10 µg/L ≤ 30 µg/L within the limit
Fluoride 0.48 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 7.8 unité pH 6.5–9 unité pH within the limit
Water hardness 17.9 °f no limit for reference
Electrical conductivity 616 µS/cm 200–1,100 µS/cm within the limit
Chloride 36 mg/L ≤ 250 mg/L within the limit
Sulphate 84 mg/L ≤ 250 mg/L within the limit
Sodium 11.8 mg/L ≤ 200 mg/L within the limit
Iron 54 µg/L ≤ 200 µg/L within the limit
Turbidity 0.15 NFU ≤ 2 NFU within the limit

Frequently asked questions

Is tap water in La Celle-Saint-Cloud safe to drink?

Yes. At the check on 26 June 2026, the tap water in La Celle-Saint-Cloud 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 La Celle-Saint-Cloud's drinking water?

The total of 20 PFAS ("forever chemicals") was last measured at 48 ng/L. The EU limit is 100 ng/L, so this water is at 48 % of the limit. (below the EU limit)

Does the water in La Celle-Saint-Cloud also meet the strictest limits in Europe?

No. The four most harmful PFAS add up to 20 ng/L. That is 5 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 Celle-Saint-Cloud's tap water?

No clear trend. Since 7 April 2025, 13 checks have been published; on the main network the PFAS-4 sum ranged between 7 ng/L and 24 ng/L (7 quantified values), at times below the detection limit. pfasnearme only reports a trend from a change of at least 25 % and 1 ng/L. These history statistics use laboratory-published sums only.

How hard is the water in La Celle-Saint-Cloud?

The water hardness in La Celle-Saint-Cloud is 17.9 °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 La Celle-Saint-Cloud, so in principle the same water.

Bougival
PFAS-4: 20 ng/L
Versailles
PFAS-4: 12 ng/L
Le Chesnay-Rocquencourt
PFAS-4: 12 ng/L
Viroflay
PFAS-4: 10 ng/L
Marly-le-Roi
PFAS-4: 17 ng/L
Fontenay-le-Fleury
PFAS-4: 17 ng/L
Louveciennes
PFAS-4: 12 ng/L
Jouy-en-Josas
PFAS-4: 10 ng/L

Nearby communes

The closest to La Celle-Saint-Cloud on this site.

Vaucresson
PFAS-4: 13 ng/L 2 km away
Croissy-sur-Seine
PFAS-4: 6 ng/L 3 km away
Marnes-la-Coquette
PFAS-4: 13 ng/L 3 km away
Garches
PFAS-4: 13 ng/L 4 km away
Le Port-Marly
PFAS-4: 17 ng/L 4 km away

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=78126
License
Licence Ouverte / Open Licence (Etalab)
Retrieved
21 September 2026
Supply networks
BOUGIVAL, VERSAILLES, LA CELLE SAINT CLOUD NORD

This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.