Water hardness in Novo mesto
14.7 °dH very hard
Tap water in Novo mesto is very hard: 14.7 °dH (262 mg/L · 15.3 gpg · 26.2 °fH).
Source: Komunala Novo mesto d.o.o., 2025 drinking-water report (PDF created 24.03.2026), table trdota vode per water source (2025) · data checked 2026-10-22
Range across supply zones: 241–284 mg/L.
Komunala Novo mesto reports 2025 values per water source. The town is supplied by two of them: Novo mesto Jezero at 15.9 °dH and Stopice at 13.5 °dH, per the report text. The 14.7 °dH shown here is the mean of those two, computed by us, not a figure the utility prints. Villages in the wider municipality use other sources, with printed values from 11.0 to 21.2 °dH.
Slovenian suppliers report total hardness in °dH ("nemške stopinje").
Water data
| Total hardness | 14.7 °dH |
|---|---|
| aggregation | median of 18 printed per-source 2025 values |
| source_values | [object Object] |
| Utility | Komunala Novo mesto d.o.o. |
How Novo mesto compares
- Tap water in Novo mesto is 34 % harder than the median of the 15 cities we track in Slovenia (11 °dH).
- By hardness it ranks 6 of 15 in Slovenia (1 = hardest); 64 % of these cities have softer water.
- In Jugovzhodna Slovenija it is number 2 of 3 cities; the regional median is 14.7 °dH.
- Nearest city with clearly softer water: Kočevje, 30 km away (10.4 °dH).
- Nearest city with clearly harder water: Grosuplje, 43 km away (20.3 °dH).
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 Novo mesto
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| 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 Novo mesto water hard or soft?
It is very hard: 262 mg/L as CaCO₃ (15.3 gpg, 14.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Novo mesto safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Slovenian suppliers report total hardness in °dH ("nemške stopinje").
How many grains per gallon is Novo mesto water?
15.3 gpg, equal to 14.7 °dH, 26.2 °fH or 262 mg/L calcium carbonate.
What dishwasher salt setting should I use in Novo mesto?
For 262 mg/L (14.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Novo mesto?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Komunala Novo mesto d.o.o., 2025 drinking-water report (PDF created 24.03.2026), table trdota vode per water source (2025). Method: computed from supplier's calcium and magnesium. Komunala Novo mesto d.o.o., 2025 drinking-water report (PDF created 24.03.2026), table trdota vode per water source · Outdated figure? Tell us