The water in Nantes
- Hardness
- 137–194 ppm
- Band
- Soft – Medium
Tap water in Nantes measures 137–194 ppm (7.7–10.9 °dH), which ranges anywhere from soft to medium, according to figures published by Nantes Métropole / ARS Pays de la Loire.
Built for this water
Parthenope
The reference blend, built for the middle of the spread. In Naples that is the high ground — the Vomero, Posillipo, Chiaiano, the Sanità — where the water sits near 21 French degrees. Dense, dark, long on the tongue. If your water lands in the middle, start here and do not move.
See the blend →Your neighbourhood matters more than your city
The water in Nantes runs from 137 ppm to 194 ppm — a spread of 57 ppm that crosses Soft → Medium. That is not imprecision: a city this size is served by several waterworks, and the average describes no tap in particular. Check which works supplies your street before you trust a city figure, ours included.
Against the SCA target zone
At its softest, Nantes sits 1.2× above the top of the zone the SCA Water Chart marks as its target (2.8–6.2 °dH). Read that as a distance, not a verdict: the chart maps taste outcomes, it does not grade cities.
The same number, three ways
- °dH
- 7.7–10.9 °dH
- °f
- 13.7–19.4 °f
- ppm CaCO₃
- 137–194 ppm
German utilities publish °dH, French and Italian ones °f, British and Irish ones ppm CaCO₃. Same water, three conventions — worth knowing if you compare your city with one abroad.
Of the 47 cities we publish, Nantes ranks 33rd by hardness.
The other cities we publish in France
Cities with the closest water to this one
Closest match abroad
The water most like Nantes's, outside France, is Zurich.
Zurich — 139–191 ppm →Where this number comes from
Published by Nantes Métropole / ARS Pays de la Loire. We do not estimate: a city without a figure we could read on the utility's own publication is not on this site at all.
Nantes Métropole / ARS Pays de la Loire →