Water hardness in Regensburg
16.9 °dH very hard
Tap water in Regensburg is very hard: 16.9 °dH (302 mg/L · 17.6 gpg · 30.2 °fH).
Source: REWAG Chemische Analyse Oktober 2025 (2025-10) · data checked 2026-10-19
REWAG's chemical analysis of October 2025 gives 301.7 mg/L CaCO₃. The sample was taken at one reservoir, the Winzerer Höhe, and REWAG states that the result applies to the whole supply area. We have no zone range, so small local differences are possible. Plan for limescale on appliances and fittings.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 16.9 °dH |
|---|---|
| Utility | REWAG (Regensburger Energie- und Wasserversorgung AG) |
How Regensburg compares
- Tap water in Regensburg is 47 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 191 of 809 in Germany (1 = hardest); 76 % of these cities have softer water.
- In Bayern it is number 60 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Schwarzenfeld, 42 km away (5.9 °dH).
- Nearest city with clearly harder water: Straubing, 38 km away (21.7 °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 Regensburg
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| 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 Regensburg water hard or soft?
It is very hard: 302 mg/L as CaCO₃ (17.6 gpg, 16.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Regensburg 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 Regensburg water?
17.6 gpg, equal to 16.9 °dH, 30.2 °fH or 302 mg/L calcium carbonate.
What dishwasher salt setting should I use in Regensburg?
For 302 mg/L (16.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Regensburg?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: REWAG Chemische Analyse Oktober 2025 (2025-10). Method: figure published by the water supplier. REWAG Chemische Analyse Oktober 2025 · Outdated figure? Tell us