Water hardness in Rosenheim
20.2 °dH very hard
Tap water in Rosenheim is very hard: 20.2 °dH (361 mg/L · 21.1 gpg · 36.1 °fH).
Source: Stadtwerke Rosenheim: Trinkwasseranalyse Hochbehälter Kreut, 11.02.2025 (2025-02) · data checked 2026-10-20
Stadtwerke Rosenheim (SWRO) publishes a drinking-water analysis for its Kreut service reservoir, dated 11 February 2025, which gives 360.6 mg/L CaCO₃. That is one reservoir and one sampling date, so other parts of the network could differ slightly. Expect fast limescale build-up in kettles and heating elements.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 20.2 °dH |
|---|---|
| Utility | Stadtwerke Rosenheim (SWRO) |
How Rosenheim compares
- Tap water in Rosenheim is 76 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 62 of 809 in Germany (1 = hardest); 92 % of these cities have softer water.
- In Bayern it is number 15 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Grassau, 26 km away (16.1 °dH).
- Nearest city with clearly harder water: Ampfing, 49 km away (26 °dH).
Ranking of the hardest and softest water in Germany →
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 Rosenheim
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| 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 Rosenheim water hard or soft?
It is very hard: 361 mg/L as CaCO₃ (21.1 gpg, 20.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rosenheim 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 Rosenheim water?
21.1 gpg, equal to 20.2 °dH, 36.1 °fH or 361 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rosenheim?
For 361 mg/L (20.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rosenheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Rosenheim: Trinkwasseranalyse Hochbehälter Kreut, 11.02.2025 (2025-02). Method: figure published by the water supplier. Stadtwerke Rosenheim: Trinkwasseranalyse Hochbehälter Kreut, 11.02.2025 · Outdated figure? Tell us