Water hardness in Grottaferrata
24.8 °fH very hard
Tap water in Grottaferrata is very hard: 24.8 °fH (248 mg/L · 14.5 gpg · 13.9 °dH).
Source: Acea Ato 2, qualità dell'acqua per zona (valori mediani) (2026-07) · data checked 2026-10-20
Range across supply zones: 172–283 mg/L.
In Grottaferrata the supply is a mix of aqueduct water, from the Simbrivio and Doganella systems, and many local wells that Acea Ato 2 operates in the Alban Hills and Prenestine mountains; the volcanic ground of the Alban Hills shapes the groundwater chemistry. The figure we show, 247.8 mg/L CaCO₃, is calculated from the utility's published analyses, with readings from 172.2 to 283.4 mg/L, which counts as very hard water. Values differ across the area, so check your own address before buying a softener; limescale builds up quickly on heating elements and taps, so a softener or regular descaling is worth considering.
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 24.8 °fH |
|---|
How Grottaferrata compares
- Tap water in Grottaferrata is 17 % harder than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 234 of 629 in Italy (1 = hardest); 63 % of these cities have softer water.
- In Lazio it is number 31 of 54 cities; the regional median is 27.2 °fH.
- Nearest city with clearly softer water: Ariccia, 7 km away (16.9 °fH).
- Nearest city with clearly harder water: Marino, 2 km away (35 °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 Grottaferrata
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| LG | H3 |
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 Grottaferrata water hard or soft?
It is very hard: 248 mg/L as CaCO₃ (14.5 gpg, 13.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grottaferrata 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 Grottaferrata water?
14.5 gpg, equal to 13.9 °dH, 24.8 °fH or 248 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grottaferrata?
For 248 mg/L (13.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Grottaferrata?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Acea Ato 2, qualità dell'acqua per zona (valori mediani) (2026-07). Method: computed from supplier's calcium and magnesium. Acea Ato 2, qualità dell'acqua per zona (valori mediani) · Outdated figure? Tell us