Water hardness in Trento
16.4 °fH hard
Tap water in Trento is hard: 16.4 °fH (164 mg/L · 9.6 gpg · 9.2 °dH).
Source: Novareti SpA / Dolomiti Energia lab report 26LA05815 (Durezza da calcolo) (2026-07) · data checked 2026-10-20
Range across supply zones: 155–177 mg/L.
6 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °fH | mg/L | ||
|---|---|---|---|
| Fontana Lungo Avisio (Trento Nord) | 16.4 | 164 | hard |
| Fontana Parco Cristo Re Sud (Fondovalle) | 15.5 | 155 | hard |
| Fontana Piazza Duomo (Fondovalle) | 15.9 | 159 | hard |
| Fontana Piazza Piedicastello (Fondovalle) | 17.7 | 177 | hard |
| Fontana Via Santa Croce (Fondovalle) | 17.2 | 172 | hard |
| Fontana Via Vittorio Veneto (Fondovalle) | 16.3 | 163 | hard |
Novareti, part of the Dolomiti Energia group, publishes lab reports per fountain. We read six city points sampled between February and June 2026, with hardness from 15.5 to 17.7 °F (155 to 177 mg/L CaCO₃) and a calculated value taken from measured calcium and magnesium. Five points are on the valley floor and one is in the north of the city. The spread is narrow, so one setting on a softener or descaling schedule should suit most addresses. We have not confirmed the source of the water from these reports.
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 16.4 °fH |
|---|---|
| Utility | Novareti SpA (Gruppo Dolomiti Energia) |
How Trento compares
- Tap water in Trento is 23 % softer than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 421 of 629 in Italy (1 = hardest); 33 % of these cities have softer water.
- In Trentino-Alto Adige it is number 3 of 5 cities; the regional median is 16.4 °fH.
- Nearest city with clearly harder water: Mori, 26 km away (22.1 °fH).
Ranking of the hardest and softest water in Italy →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Trento
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Trento water hard or soft?
It is hard: 164 mg/L as CaCO₃ (9.6 gpg, 9.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Trento safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
How many grains per gallon is Trento water?
9.6 gpg, equal to 9.2 °dH, 16.4 °fH or 164 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trento?
For 164 mg/L (9.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Trento?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Novareti SpA / Dolomiti Energia lab report 26LA05815 (Durezza da calcolo) (2026-07). Method: own measurement. Novareti SpA / Dolomiti Energia lab report 26LA05815 (Durezza da calcolo) · Outdated figure? Tell us