Water hardness in Sezze
32.9 °fH very hard
Tap water in Sezze is very hard: 32.9 °fH (329 mg/L · 19.2 gpg · 18.4 °dH).
Source: Acqualatina, qualità dell'acqua per comune (valori medi II semestre 2020) (2020) · data checked 2026-10-29
This figure is over 3 years old; hardness may have changed.
Acqualatina supplies southern Lazio, and the water is mostly from springs and wells in the Lepini, Ausoni and Aurunci limestone mountains and the Pontine plain. The only figure we have is 329.0 mg/L CaCO₃, which counts as very hard water (a 2020 figure that may have changed since). 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 | 32.9 °fH |
|---|---|
| calcio_mg_l | 94.3 |
| magnesio_mg_l | 24.5 |
| Utility | Acqualatina |
How Sezze compares
- Tap water in Sezze is 55 % harder than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 66 of 629 in Italy (1 = hardest); 90 % of these cities have softer water.
- In Lazio it is number 18 of 54 cities; the regional median is 27.2 °fH.
- Nearest city with clearly softer water: Priverno, 10 km away (24.7 °fH).
- Nearest city with clearly harder water: Pontinia, 10 km away (41.3 °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 Sezze
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| 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 Sezze water hard or soft?
It is very hard: 329 mg/L as CaCO₃ (19.2 gpg, 18.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sezze 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 Sezze water?
19.2 gpg, equal to 18.4 °dH, 32.9 °fH or 329 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sezze?
For 329 mg/L (18.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Sezze?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Acqualatina, qualità dell'acqua per comune (valori medi II semestre 2020) (2020). Method: older figure, source currently unavailable. Acqualatina, qualità dell'acqua per comune (valori medi II semestre 2020) · Outdated figure? Tell us