PFAS in Tours's tap water: 11.1 ng/L, 22.2x our 0.5 ng/L benchmark
Last PFAS check: · Source: Hub'eau
PFAS in drinking water
22.2× 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.
One of these four, PFOA, is classified as causing cancer in humans by the WHO's cancer research agency (IARC).
More PFAS than in 97% of the cities we track
checked on 22 July 2026
20 PFAS (see each substance)
| PFAS substance | Value |
|---|---|
| Perfluorohexane sulfonate (PFHXS) | 0.0045 µg/L |
| Acide sulfonique de perfluorooctane (PFOS) | 0.0037 µg/L |
| Acide perfluoropentanoïque (PFPEA) | 0.0035 µg/L |
| Acide perfluorobutanoïque (PFBA) | 0.0035 µg/L |
| Acide perfluorohexanoïque (PFHXA) | 0.003 µg/L |
| Acide perfluoro-octanoïque (PFOA) | 0.0022 µg/L |
| Acide perfluoroheptanoïque (PFHPA) | 0.002 µg/L |
| Acide sulfonique de perfluorobutane (PFBS) | 0.0018 µg/L |
| Acide perfluoro-nonanoïque (PFNA) | 0.0007 µg/L |
| Acide perfluoroheptane sulfonique (PFHpS) | <0,001 µg/L |
| Acide perfluoro tridecanoique (PFTrDA) | <0,001 µg/L |
| Acide perfluoro-decanoïque (PFDA) | <0,0015 µg/L |
| Acide perfluoro undecane sulfonique (PFUnDS) | <0,0015 µg/L |
| Acide perfluorodecane sulfonique (PFDS) | <0,001 µg/L |
| Acide perfluoro tridecane sulfonique (PFTrDS) | <0,0015 µg/L |
| Acide perfluorododécanoique (PFDoDA) | <0,0015 µg/L |
| Acide perfluorododécane sulfonique (PFDoDS) | <0,0015 µg/L |
| Acide perfluoro undecanoïque (PFUnA) | <0,0015 µg/L |
| Acide perfluorononane sulfonique (PFNS) | <0,001 µg/L |
| Acide perfluoropentane sulfonique (PFPS) | <0,001 µg/L |
Above our health benchmark. Here are some filter options.
- EU legal limit
- 25 ng/L sum of 20 PFAS, below the 100 ng/L limit
- Last PFAS test
- 22 July 2026
- Water supplier
- TOURS METROPOLE VAL DE LOIRE
In Tours, the 4 most closely watched PFAS (PFAS-4) add up to 11.1 ng/L (0.0111 µg/L) at the latest PFAS check on 22 July 2026. That's 22.2 times our 0.5 ng/L health benchmark, and above Sweden's legal limit of 4 ng/L. Sum of 20 PFAS: 25 ng/L (0.025 µg/L), below the EU legal limit (100 ng/L). 24 checks since 13 May 2024: sum of 20 PFAS up to 25 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 Tours
24 PFAS checks since 13 May 2024, from the published measurements. Samples from 3 communes on the same network: it's the same water, so each one applies to Tours. Samples come from 2 distribution networks. The trend refers to the network “TOURS (VILLE)”.
“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 |
|---|---|---|---|---|
| 11.1 ng/L · calculated | 25 ng/L | Tours | TOURS (VILLE) | |
| 4.9 ng/L · calculated | 15 ng/L | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| 2.2 ng/L – < 4.2 ng/L · calculated | 7.7 ng/L | Tours | TOURS (VILLE) | |
| 1.3 ng/L – < 3.8 ng/L · calculated | 2.2 ng/L | La Membrolle-sur-Choisille | ST CYR SUR LOIRE | |
| 1.8 ng/L – < 3.8 ng/L · calculated | 4.8 ng/L | Tours | TOURS (VILLE) | |
| 3 ng/L – < 5 ng/L · calculated | 18 ng/L | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| 1.3 ng/L – < 3.8 ng/L · calculated | 1.8 ng/L | Tours | TOURS (VILLE) | |
| 0.9 ng/L – < 4.4 ng/L · calculated | 3.6 ng/L | Tours | TOURS (VILLE) | |
| 2.9 ng/L – < 5.4 ng/L · calculated | 10 ng/L | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| 2.1 ng/L – < 4.6 ng/L · calculated | 7.5 ng/L | Tours | TOURS (VILLE) | |
| 5.9 ng/L – < 6.4 ng/L · calculated | 15 ng/L | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| 12.8 ng/L – < 13.8 ng/L · calculated | 17 ng/L | Tours | TOURS (VILLE) |
Show the 12 earlier checks (back to 13 May 2024)
| < 12 ng/L · calculated | 2.2 ng/L | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| < 10 ng/L · calculated | < detection limit | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE | |
| < 10 ng/L · calculated | < detection limit | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Tours | TOURS (VILLE) | |
| 2.1 ng/L – < 10.1 ng/L · calculated | 2.1 ng/L | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | 2.5 ng/L | Tours | TOURS (VILLE) | |
| 11.1 ng/L – < 13.1 ng/L · calculated | 15 ng/L | Tours | TOURS (VILLE) | |
| < 10 ng/L · calculated | < detection limit | Saint-Cyr-sur-Loire | ST CYR SUR LOIRE |
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 21 test results
| What was tested | Value | Limit | Status |
|---|---|---|---|
| Nitrate | 5.1 mg/L | ≤ 50 mg/L | within the limit |
| Nitrite | <0,010 mg/L | ≤ 0.5 mg/L | within the limit |
| Lead | 1.8 µg/L | ≤ 10 µg/L | within the limit |
| Copper | 0.177 mg(Cu)/L | ≤ 2 mg(Cu)/L | within the limit |
| Nickel | 1.3 µg/L | ≤ 20 µg/L | within the limit |
| Arsenic | 2.6 µg/L | ≤ 10 µg/L | within the limit |
| Cadmium | <0,010 µg/L | ≤ 5 µg/L | within the limit |
| Chromium | 0.6 µg/L | ≤ 50 µg/L | within the limit |
| Uranium | 0.9 µg/L | ≤ 30 µg/L | within the limit |
| Fluoride | 0.206 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 | 7.5 unité pH | 6.5–9 unité pH | within the limit |
| Water hardness | 14.3 °f | no limit | for reference |
| Electrical conductivity | 338 µS/cm | 180–1,000 µS/cm | within the limit |
| Chloride | 27.3 mg/L | ≤ 250 mg/L | within the limit |
| Sulphate | 21.4 mg/L | ≤ 250 mg/L | within the limit |
| Sodium | 17.3 mg/L | ≤ 200 mg/L | within the limit |
| Iron | 10 µg/L | ≤ 200 µg/L | within the limit |
| Turbidity | <0,30 NFU | ≤ 2 NFU | within the limit |
Frequently asked questions
Is tap water in Tours safe to drink?
Yes. At the check on 31 July 2026, the tap water in Tours was within every limit tested. “Eau d'alimentation conforme aux limites de qualité et non conforme aux références de qualité pour la température. Une température élevée de l’eau stimule la croissance des micro-organismes et peut accroître les problèmes liés au goût, à l’odeur, à la coloration et à la corrosion.”
How high are PFAS levels in Tours's drinking water?
The total of 20 PFAS ("forever chemicals") was last measured at 25 ng/L. The EU limit is 100 ng/L, so this water is at 25 % of the limit. (below the EU limit)
Does the water in Tours also meet the strictest limits in Europe?
No. The four most harmful PFAS add up to 11.1 ng/L. That is 2.8 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 Tours'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 Tours?
The water hardness in Tours is 14.3 °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 Tours, so in principle the same water.
Nearby communes
The closest to Tours 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=37261
- License
- Licence Ouverte / Open Licence (Etalab)
- Retrieved
- 21 September 2026
- Supply networks
- ST CYR SUR LOIRE, TOURS (VILLE)
Water report for Tours
Get new PFAS results for Tours, 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.