Water hardness in Rho
21.3 °fH very hard
Tap water in Rho is very hard: 21.3 °fH (213 mg/L · 12.5 gpg · 11.9 °dH).
Source: Gruppo CAP, analisi acquedotto (open data), 2025 Q3–2026 Q2 (2026-06) · data checked 2026-10-19
Range across supply zones: 177–266 mg/L.
Gruppo CAP supplies Rho with groundwater pumped from wells in the Po plain around Milan; part of it needs treatment and the rest enters the network untreated; the alluvial aquifer carries dissolved calcium and magnesium from the sediments. Published analyses give a typical value of 213.3 mg/L CaCO₃, with readings from 176.9 to 265.6 mg/L, 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 | 21.3 °fH |
|---|
How Rho compares
- Tap water in Rho is close to the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 311 of 629 in Italy (1 = hardest); 51 % of these cities have softer water.
- In Lombardia it is number 103 of 142 cities; the regional median is 24.9 °fH.
- Nearest city with clearly softer water: Pregnana Milanese, 3 km away (15.2 °fH).
- Nearest city with clearly harder water: Pogliano Milanese, 4 km away (27.6 °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 Rho
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| 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 Rho water hard or soft?
It is very hard: 213 mg/L as CaCO₃ (12.5 gpg, 11.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rho 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 Rho water?
12.5 gpg, equal to 11.9 °dH, 21.3 °fH or 213 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rho?
For 213 mg/L (11.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rho?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gruppo CAP, analisi acquedotto (open data), 2025 Q3–2026 Q2 (2026-06). Method: computed from supplier's calcium and magnesium. Gruppo CAP, analisi acquedotto (open data), 2025 Q3–2026 Q2 · Outdated figure? Tell us