Water hardness in Radolfzell am Bodensee
22.6 °dH very hard
Tap water in Radolfzell am Bodensee is very hard: 22.6 °dH (403 mg/L · 23.6 gpg · 40.3 °fH).
Source: Stadtwerke Radolfzell, Wasserpreise 2026 (Trinkwasser in Härtegraden, Radolfzeller Ortsteile table) (2026-07) · data checked 2026-10-23
Range across supply zones: 370–445 mg/L.
8 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Böhringen | 20.7 | 370 | very hard |
| Güttingen | 22.3 | 398 | very hard |
| Kernstadt Radolfzell | 22.9 | 409 | very hard |
| Liggeringen | 24.9 | 445 | very hard |
| Markelfingen | 21.3 | 380 | very hard |
| Möggingen | 22.3 | 398 | very hard |
| Reute | 23.6 | 421 | very hard |
| Stahringen | 24.6 | 439 | very hard |
Stadtwerke Radolfzell lists hardness for eight districts in its 2026 price sheet, ranging from 369.5 mg/L CaCO₃ in Böhringen to 444.5 mg/L in Liggeringen. The core town is at 408.8 mg/L, and 403.4 mg/L is the median of the eight. The sheet does not state where the water comes from, so we cannot explain the hardness. Every district is very hard, so scale protection matters more than the choice of district.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 22.6 °dH |
|---|---|
| Utility | Stadtwerke Radolfzell |
How Radolfzell am Bodensee compares
- Tap water in Radolfzell am Bodensee is 96 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 28 of 809 in Germany (1 = hardest); 97 % of these cities have softer water.
- In Baden-Württemberg it is number 4 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Überlingen, 15 km away (9.1 °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 Radolfzell am Bodensee
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 23 °dH |
| AEG / Electrolux | 5 |
| 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 Radolfzell am Bodensee water hard or soft?
It is very hard: 403 mg/L as CaCO₃ (23.6 gpg, 22.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Radolfzell am Bodensee 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 Radolfzell am Bodensee water?
23.6 gpg, equal to 22.6 °dH, 40.3 °fH or 403 mg/L calcium carbonate.
What dishwasher salt setting should I use in Radolfzell am Bodensee?
For 403 mg/L (22.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Radolfzell am Bodensee?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Radolfzell, Wasserpreise 2026 (Trinkwasser in Härtegraden, Radolfzeller Ortsteile table) (2026-07). Method: figure published by the water supplier. Stadtwerke Radolfzell, Wasserpreise 2026 (Trinkwasser in Härtegraden, Radolfzeller Ortsteile table) · Outdated figure? Tell us