Water hardness in Ptuj
15.6 °dH very hard
Tap water in Ptuj is very hard: 15.6 °dH (279 mg/L · 16.3 gpg · 27.9 °fH).
Source: Komunalno podjetje Ptuj d.d., Trdota vode in minerali (web page, measurements 2023) (2023) · data checked 2026-10-22
Range across supply zones: 189–336 mg/L.
7 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| OO 1 | 16.2 | 288 | very hard |
| OO 2 | 16.2 | 288 | very hard |
| OO 3 | 14.5 | 260 | very hard |
| OO 4 | 15.6 | 279 | very hard |
| OO 5 | 15.4 | 275 | very hard |
| OO 6 | 13.8 | 246 | very hard |
| OO 7 | 15.6 | 279 | very hard |
Komunalno podjetje Ptuj prints hardness ranges for seven supply areas, but only as ranges and only from measurements made in 2023, so this page is flagged as stale. Most areas fall between about 13 and 19 °dH, and area 6 reaches down to 10.6 °dH. The 2025 annual report has no hardness figures, so these are the latest printed values. Ask the utility which area serves your address.
Slovenian suppliers report total hardness in °dH ("nemške stopinje").
Water data
| Total hardness | 15.6 °dH |
|---|---|
| Utility | Komunalno podjetje Ptuj d.d. (name as printed on page) |
How Ptuj compares
- Tap water in Ptuj is 42 % harder than the median of the 15 cities we track in Slovenia (11 °dH).
- By hardness it ranks 5 of 15 in Slovenia (1 = hardest); 71 % of these cities have softer water.
- Nearest city with clearly softer water: Turnišče, 41 km away (8.4 °dH).
- Nearest city with clearly harder water: Grosuplje, 107 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 Ptuj
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| 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 Ptuj water hard or soft?
It is very hard: 279 mg/L as CaCO₃ (16.3 gpg, 15.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ptuj 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 Ptuj water?
16.3 gpg, equal to 15.6 °dH, 27.9 °fH or 279 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ptuj?
For 279 mg/L (15.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ptuj?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Komunalno podjetje Ptuj d.d., Trdota vode in minerali (web page, measurements 2023) (2023). Method: computed from supplier's calcium and magnesium. Komunalno podjetje Ptuj d.d., Trdota vode in minerali (web page, measurements 2023) · Outdated figure? Tell us