Water hardness in San Pier d'Isonzo
17.9 °fH hard
Tap water in San Pier d'Isonzo is hard: 17.9 °fH (179 mg/L · 10.4 gpg · 10 °dH).
Source: Irisacqua, medie potabili I semestre 2026 (2026-06) · data checked 2026-11-05
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 17.9 °fH |
|---|
How San Pier d'Isonzo compares
- Tap water in San Pier d'Isonzo is 16 % softer than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 399 of 629 in Italy (1 = hardest); 37 % of these cities have softer water.
- In Friuli-Venezia Giulia it is number 6 of 7 cities; the regional median is 19.8 °fH.
- Nearest city with clearly harder water: Cormons, 12 km away (29.9 °fH).
Ranking of the hardest and softest water in Italy →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in San Pier d'Isonzo
| 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 San Pier d'Isonzo water hard or soft?
It is hard: 179 mg/L as CaCO₃ (10.4 gpg, 10 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in San Pier d'Isonzo 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 San Pier d'Isonzo water?
10.4 gpg, equal to 10 °dH, 17.9 °fH or 179 mg/L calcium carbonate.
What dishwasher salt setting should I use in San Pier d'Isonzo?
For 179 mg/L (10 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in San Pier d'Isonzo?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Irisacqua, medie potabili I semestre 2026 (2026-06). Method: computed from supplier's calcium and magnesium. Irisacqua, medie potabili I semestre 2026 · Outdated figure? Tell us