Water hardness in Kaštel Stari
377 mg/L very hard
Tap water in Kaštel Stari is very hard: 377 mg/L (22 gpg · 21.1 °dH · 37.7 °fH).
Source: VIK Split, Mreža Kaštela lab results 01.10.2026-31.10.2026 (Ukupna tvrdoća mg/l, min/avg/max) (2026-10) · data checked 2026-11-05
Range across supply zones: 354–399 mg/L.
Croatian suppliers report total hardness in mg/L CaCO₃ or °dH.
Water data
| Total hardness | 377 mg/L |
|---|---|
| Utility | Vodovod i kanalizacija d.o.o. Split (VIK Split) |
How Kaštel Stari compares
- Tap water in Kaštel Stari is 11 % harder than the median of the 13 cities we track in Croatia (339 mg/L).
- By hardness it ranks 2 of 13 in Croatia (1 = hardest); 92 % of these cities have softer water.
- In Splitsko-dalmatinska it is number 2 of 5 cities; the regional median is 366 mg/L.
- Nearest city with clearly softer water: Šibenik, 42 km away (250 mg/L).
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 Kaštel Stari
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 21 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Kaštel Stari water hard or soft?
It is very hard: 377 mg/L as CaCO₃ (22 gpg, 21.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kaštel Stari safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Croatian suppliers report total hardness in mg/L CaCO₃ or °dH.
How many grains per gallon is Kaštel Stari water?
22 gpg, equal to 21.1 °dH, 37.7 °fH or 377 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kaštel Stari?
For 377 mg/L (21.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Kaštel Stari?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: VIK Split, Mreža Kaštela lab results 01.10.2026-31.10.2026 (Ukupna tvrdoća mg/l, min/avg/max) (2026-10). Method: own measurement. VIK Split, Mreža Kaštela lab results 01.10.2026-31.10.2026 (Ukupna tvrdoća mg/l, min/avg/max) · Outdated figure? Tell us