PFAS in Loos's tap water: under 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 4 ng/L, 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 Prémesques, on the same distribution network as Loos (LOOS). 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 1 ng/L upward. None reached that limit, so their total is below 4 ng/L rather than zero.
checked on 15 June 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Acide perfluoropentanoïque (PFPEA) | 0.001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,002 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,002 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,001 µg/L |
| Perfluorohexane sulfonate (PFHXS) | <0,001 µg/L |
| Acide perfluoro-octanoïque (PFOA) | <0,001 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,005 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluorobutanoïque (PFBA) | <0,001 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,002 µg/L |
| Acide perfluorohexanoïque (PFHXA) | <0,002 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,001 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | <0,001 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,001 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | <0,001 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | <0,001 µg/L |
None found. The lab sees nothing below 4 ng/L, so our 0.5 ng/L benchmark cannot be checked.
Water report for Loos
Get new PFAS results for Loos, with a short explanation. At most one update a week, only when there's something new.
- EU legal limit
- 1 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 15 June 2026
- Water supplier
- ILEO
In Loos, none of the 4 most closely watched PFAS (PFAS-4) was detected at the latest PFAS check on 15 June 2026. The total is below 4 ng/L, the sum of the detection limits and 8 times our 0.5 ng/L benchmark. Sum of 20 PFAS: 1 ng/L (0.001 µg/L), below the EU legal limit (100 ng/L). Sampled in Prémesques, on the same network. 11 checks since 4 January 2024: PFAS-4 up to 12 ng/L, sometimes below the detection limit, averaging at least 8.5 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
PFAS over time in Loos
11 PFAS checks since 4 January 2024, values as published. Samples from 5 communes on the same network: it's the same water, so each one applies to Loos. Samples come from 2 distribution networks. The trend refers to the network “LOOS”.
| Date | PFAS-4 | Sum of 20 PFAS | Sampled at | Network |
|---|---|---|---|---|
| < 1 ng/L | 1 ng/L | Prémesques | LOOS | |
| 12 ng/L | 17 ng/L | Wavrin | LOOS | |
| 10 ng/L | 17 ng/L | Beaucamps-Ligny | LOOS | |
| 8 ng/L | 21 ng/L | Loos | 059000545 | |
| 11 ng/L | 18 ng/L | Erquinghem-le-Sec | LOOS | |
| 10 ng/L | 15 ng/L | Wavrin | LOOS | |
| 7 ng/L | 20 ng/L | Loos | 059000545 | |
| 8 ng/L | 10 ng/L | Loos | LOOS | |
| – | 15.6 ng/L | Wavrin | LOOS | |
| – | 14.6 ng/L | Wavrin | LOOS | |
| – | 45.9 ng/L | Loos | 059000545 |
“<” means not detected, the figure being the detection limit. “–” means not published. Labs have only reported the PFAS-4 sum (SANDRE code 9268) since autumn 2025. 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 | 25.5 mg/L | ≤ 50 mg/L | within the limit |
| Nickel | 12 µg/L | ≤ 20 µg/L | within the limit |
See all 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 25.5 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 | <0,010 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 12 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 | 0.19 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 | 7.4 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 32.27 °f | no limit | for reference |
| Electrical conductivity | 810 µS/cm | 200–1,100 µS/cm | within the limit |
| Chloride | 59 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 155 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 26.7 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 26 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | 0.22 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Loos safe to drink?
Yes. At the check on 16 July 2026, the tap water in Loos 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 Loos's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 1 ng/L. The EU limit is 100 ng/L, so this water is at 1 % of the limit. (below the EU limit)
Does the water in Loos 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 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 Loos's tap water?
No clear trend. Since 4 January 2024, 11 checks have been published; on the main network the PFAS-4 sum ranged between 8 ng/L and 12 ng/L (5 quantified values), at times below the detection limit. pfasnearme only reports a trend from a change of at least 25 % and 1 ng/L.
How hard is the water in Loos?
The water hardness in Loos is 32.3 °f (hard). 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 Loos, so in principle the same water.
Nearby communes
The closest to Loos 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=59360
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- LOOS
This site is a data project, not an official source. If in doubt, check with your water supplier or local authority.