Water hardness in Collegno
23.3 °fH very hard
Tap water in Collegno is very hard: 23.3 °fH (233 mg/L · 13.6 gpg · 13.1 °dH).
Source: SMAT Torino, monitoraggio acque (valori medi), 2026 H1 (2026-06) · data checked 2026-10-19
SMAT supplies Collegno mainly from deep groundwater, with smaller contributions from surface water and mountain springs; because the blend differs by area, hardness changes between towns on the same network. Published analyses give a typical value of 233.4 mg/L CaCO₃, which counts as very hard water. Expect scale on kettles, shower heads and in the water heater, and descaling about as often as a hard-water kitchen requires.
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 23.3 °fH |
|---|
How Collegno compares
- Tap water in Collegno is 10 % harder than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 271 of 629 in Italy (1 = hardest); 57 % of these cities have softer water.
- In Piemonte it is number 41 of 242 cities; the regional median is 12.3 °fH.
- Nearest city with clearly softer water: Druento, 6 km away (12.1 °fH).
- Nearest city with clearly harder water: Rivoli, 4 km away (32.8 °fH).
Ranking of the hardest and softest water in Italy →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Collegno
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| 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 Collegno water hard or soft?
It is very hard: 233 mg/L as CaCO₃ (13.6 gpg, 13.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Collegno 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 Collegno water?
13.6 gpg, equal to 13.1 °dH, 23.3 °fH or 233 mg/L calcium carbonate.
What dishwasher salt setting should I use in Collegno?
For 233 mg/L (13.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Collegno?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SMAT Torino, monitoraggio acque (valori medi), 2026 H1 (2026-06). Method: computed from supplier's calcium and magnesium. SMAT Torino, monitoraggio acque (valori medi), 2026 H1 · Outdated figure? Tell us