Water hardness in Deggendorf
3.7 °dH moderately hard
Tap water in Deggendorf is moderately hard: 3.7 °dH (65 mg/L · 3.8 gpg · 6.5 °fH).
Source: Stadtwerke Deggendorf – Trinkwasser (2026) · data checked 2026-10-23
Range across supply zones: 43–88 mg/L.
Stadtwerke Deggendorf's drinking water page gives a range of 0.43 to 0.87 mmol/L, which converts to 42.8 to 87.5 mg/L CaCO₃. The city figure of 65.2 mg/L is computed from that range. Straubing, 29 km away, is listed at 387.3 mg/L, so do not assume the same water in neighbouring towns.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 3.7 °dH |
|---|---|
| mmol_range | 0.43-0.87 |
| Utility | Stadtwerke Deggendorf |
How Deggendorf compares
- Tap water in Deggendorf is 68 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 784 of 809 in Germany (1 = hardest); 3 % of these cities have softer water.
- In Bayern it is number 136 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Karlsfeld, 129 km away (2.6 °dH).
- Nearest city with clearly harder water: Vilshofen an der Donau, 28 km away (10.1 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Deggendorf
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Deggendorf water hard or soft?
It is moderately hard: 65 mg/L as CaCO₃ (3.8 gpg, 3.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Deggendorf safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Deggendorf water?
3.8 gpg, equal to 3.7 °dH, 6.5 °fH or 65 mg/L calcium carbonate.
What dishwasher salt setting should I use in Deggendorf?
For 65 mg/L (3.7 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Deggendorf?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Stadtwerke Deggendorf – Trinkwasser (2026). Method: computed from supplier's calcium and magnesium. Stadtwerke Deggendorf – Trinkwasser · Outdated figure? Tell us