Water hardness in Grosseto
9 °fH moderately hard
Tap water in Grosseto is moderately hard: 9 °fH (90 mg/L · 5.3 gpg · 5 °dH).
Source: Acquedotto del Fiora, qualità dell'acqua (analisi per zona di fornitura, 1° semestre 2026) (2026-06) · data checked 2026-10-29
Acquedotto del Fiora supplies Grosseto as part of its Grosseto and Siena service area; its historic core is the group of springs on Monte Amiata at Santa Fiora; we have not verified which source reaches Grosseto directly. The utility reports 90.0 mg/L CaCO₃, which counts as moderately hard water. Scale forms slowly, so occasional descaling of the kettle is usually all it needs.
Italian utilities report °f (French degrees); D.Lgs. 31/2001 recommends 15–50 °f.
Water data
| Total hardness | 9 °fH |
|---|---|
| calcio_mg_l | 22.7 |
| magnesio_mg_l | 8.7 |
| Utility | Acquedotto del Fiora |
How Grosseto compares
- Tap water in Grosseto is 58 % softer than the median of the 629 cities we track in Italy (21.2 °fH).
- By hardness it ranks 544 of 629 in Italy (1 = hardest); 13 % of these cities have softer water.
- In Toscana it is number 9 of 9 cities; the regional median is 23 °fH.
- Nearest city with clearly harder water: Follonica, 34 km away (12 °fH).
Ranking of the hardest and softest water in Italy →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Grosseto
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Grosseto water hard or soft?
It is moderately hard: 90 mg/L as CaCO₃ (5.3 gpg, 5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grosseto 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 Grosseto water?
5.3 gpg, equal to 5 °dH, 9 °fH or 90 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grosseto?
For 90 mg/L (5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Grosseto?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Acquedotto del Fiora, qualità dell'acqua (analisi per zona di fornitura, 1° semestre 2026) (2026-06). Method: figure published by the water supplier. Acquedotto del Fiora, qualità dell'acqua (analisi per zona di fornitura, 1° semestre 2026) · Outdated figure? Tell us