Water hardness in Érd
16.4 °dH very hard
Tap water in Érd is very hard: 16.4 °dH (293 mg/L · 17.1 gpg · 29.3 °fH).
Source: NNGYK — Magyarországi települések ivóvízminősége (HUMVI 2024) (2024) · data checked 2026-10-21
Érd lies in a protected Danube riverbank-filtration catchment, so its water comes at least partly from wells in the river's gravel banks. Water filtered through the Danube's gravel banks carries calcium and magnesium from limestone and dolomite in the river's catchment, which usually makes it hard; the 2024 national report lists Érd at 292.7 mg/L CaCO₃ (very hard). Appliances that heat water will collect scale, so periodic descaling pays off.
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 | 16.4 °dH |
|---|
How Érd compares
- Tap water in Érd is close to the median of the 3053 cities we track in Hungary (16.1 °dH).
- By hardness it ranks 1454 of 3053 in Hungary (1 = hardest); 52 % of these cities have softer water.
- In Pest it is number 57 of 193 cities; the regional median is 14.5 °dH.
- Nearest city with clearly softer water: Taksony, 14 km away (6 °dH).
- Nearest city with clearly harder water: Erdőhát, 10 km away (25 °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 Érd
| 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 Érd water hard or soft?
It is very hard: 293 mg/L as CaCO₃ (17.1 gpg, 16.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Érd 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 Érd water?
17.1 gpg, equal to 16.4 °dH, 29.3 °fH or 293 mg/L calcium carbonate.
What dishwasher salt setting should I use in Érd?
For 293 mg/L (16.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Érd?
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