Water hardness in Oroszlány
23.6 °dH very hard
Tap water in Oroszlány is very hard: 23.6 °dH (421 mg/L · 24.6 gpg · 42.1 °fH).
Source: NNGYK — Magyarországi települések ivóvízminősége (HUMVI 2024) (2024) · data checked 2026-10-21
Oroszlány is supplied by the Északdunántúli Vízmű (ÉDV), which relies on karst water from the Tata–Tatabánya basin; its regional network is being expanded. Limestone and dolomite of the Transdanubian Mountains release calcium and magnesium into the water, which is why supplies tied to this karst are among the hardest in Hungary; the 2024 national report lists Oroszlány at 421.2 mg/L CaCO₃ (very hard). Limescale forms fast on heating elements, taps and glass, which makes a softener or descale routine worthwhile.
Hungarian suppliers report total hardness in German degrees (nk°) or mg/L CaO; the limit is 50–350 mg/L CaO.
Water data
| Total hardness | 23.6 °dH |
|---|
How Oroszlány compares
- Tap water in Oroszlány is 47 % harder than the median of the 3053 cities we track in Hungary (16.1 °dH).
- By hardness it ranks 342 of 3053 in Hungary (1 = hardest); 89 % of these cities have softer water.
- In Komárom-Esztergom it is number 41 of 75 cities; the regional median is 23.8 °dH.
- Nearest city with clearly softer water: Vértesszőlős, 16 km away (16.9 °dH).
- Nearest city with clearly harder water: Szápár, 28 km away (30.6 °dH).
Ranking of the hardest and softest water in Hungary →
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 Oroszlány
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 24 °dH |
| AEG / Electrolux | 6 |
| 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 Oroszlány water hard or soft?
It is very hard: 421 mg/L as CaCO₃ (24.6 gpg, 23.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Oroszlány safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Hungarian suppliers report total hardness in German degrees (nk°) or mg/L CaO; the limit is 50–350 mg/L CaO.
How many grains per gallon is Oroszlány water?
24.6 gpg, equal to 23.6 °dH, 42.1 °fH or 421 mg/L calcium carbonate.
What dishwasher salt setting should I use in Oroszlány?
For 421 mg/L (23.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Oroszlány?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: NNGYK — Magyarországi települések ivóvízminősége (HUMVI 2024) (2024). Method: figure published by the water supplier. NNGYK — Magyarországi települések ivóvízminősége (HUMVI 2024) · Outdated figure? Tell us