Water hardness in Formia
18.1 °fH very hard
Tap water in Formia is very hard: 18.1 °fH (181 mg/L · 10.6 gpg · 10.1 °dH).
Source: Acqualatina, qualità dell'acqua per comune (valori medi II semestre 2020) (2020) · data checked 2026-10-29
Range across supply zones: 180–182 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °fH | mg/L | ||
|---|---|---|---|
| Formia (Capodacqua) | 18.2 | 182 | very hard |
| Formia centro storico (serbatoio S. Antonio) | 18 | 180 | very hard |
This figure is over 3 years old; hardness may have changed.
Acqualatina delivers the water in Formia; the utility uses springs and wells in the limestone ranges around the Pontine plain, though the page we used does not name the intake for Formia. We hold a value of 181.0 mg/L CaCO₃ across 2 supply zones, with readings from 180.0 to 182.0 mg/L, which counts as very hard water (a 2020 figure that may have changed since). Values differ across the area, so check your own address before buying a softener; kettles, steam irons and dishwashers collect scale fast at this level, and a softener is a common answer.
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 18.1 °fH |
|---|---|
| calcio_mg_l | 56.2 |
| magnesio_mg_l | 9.4 |
| Utility | Acqualatina |
How Formia compares
- Tap water in Formia is 15 % softer than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 390 of 629 in Italy (1 = hardest); 38 % of these cities have softer water.
- In Lazio it is number 42 of 54 cities; the regional median is 27.2 °fH.
- Nearest city with clearly softer water: Cori, 72 km away (13.6 °fH).
- Nearest city with clearly harder water: Itri, 8 km away (30.8 °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 Formia
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| 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 Formia water hard or soft?
It is very hard: 181 mg/L as CaCO₃ (10.6 gpg, 10.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Formia 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 Formia water?
10.6 gpg, equal to 10.1 °dH, 18.1 °fH or 181 mg/L calcium carbonate.
What dishwasher salt setting should I use in Formia?
For 181 mg/L (10.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Formia?
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