Water hardness in Straža
15.9 °dH very hard
Tap water in Straža is very hard: 15.9 °dH (284 mg/L · 16.6 gpg · 28.4 °fH).
Source: Komunala Novo mesto d.o.o., 2025 drinking-water report (table of water sources, NM - Jezero row) (2025) · data checked 2026-11-05
Straža is not a separate system. Komunala Novo mesto supplies Dolenja and Gorenja Straža from the Novo mesto–Jezero system, and its 2025 report lists 15.9 °dH for that whole system. That figure is system-wide, not a measurement taken in Straža itself. Other Novo mesto systems, such as Vrhpolje and Stopiče, report different values, so check which system serves your street.
Slovenian suppliers report total hardness in °dH ("nemške stopinje").
Water data
| Total hardness | 15.9 °dH |
|---|---|
| Utility | Komunala Novo mesto d.o.o. |
How Straža compares
- Tap water in Straža is 45 % harder than the median of the 15 cities we track in Slovenia (11 °dH).
- By hardness it ranks 4 of 15 in Slovenia (1 = hardest); 79 % of these cities have softer water.
- In Jugovzhodna Slovenija it is number 1 of 3 cities; the regional median is 14.7 °dH.
- Nearest city with clearly softer water: Kočevje, 23 km away (10.4 °dH).
- Nearest city with clearly harder water: Grosuplje, 38 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 Straža
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| 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 Straža water hard or soft?
It is very hard: 284 mg/L as CaCO₃ (16.6 gpg, 15.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Straža 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 Straža water?
16.6 gpg, equal to 15.9 °dH, 28.4 °fH or 284 mg/L calcium carbonate.
What dishwasher salt setting should I use in Straža?
For 284 mg/L (15.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Straža?
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 (table of water sources, NM - Jezero row) (2025). Method: figure published by the water supplier. Komunala Novo mesto d.o.o., 2025 drinking-water report (table of water sources, NM - Jezero row) · Outdated figure? Tell us