Water hardness in Wiesloch
22.3 °dH very hard
Tap water in Wiesloch is very hard: 22.3 °dH (399 mg/L · 23.3 gpg · 39.9 °fH).
Source: Stadtwerke Wiesloch, Ergebnisse der Trinkwasseranalysen 2024 (Messwerte vom 20.11.2024) (2024-11) · data checked 2026-10-23
Range across supply zones: 387–411 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Schatthausen | 21.7 | 387 | very hard |
| Wiesloch (incl. Baiertal per utility page) | 23 | 411 | very hard |
Stadtwerke Wiesloch lists two supply columns in its 2024 analysis, sampled on 20 November 2024. Wiesloch itself is 410.5 mg/L CaCO₃ and Schatthausen 387.3 mg/L, giving a median of 398.9 mg/L, which is hard. Calcium of 125 mg/L in the Wiesloch sample points to a lime-rich aquifer, so expect heavy scale on 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 | 22.3 °dH |
|---|---|
| Utility | Stadtwerke Wiesloch |
How Wiesloch compares
- Tap water in Wiesloch is 94 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 31 of 809 in Germany (1 = hardest); 96 % of these cities have softer water.
- In Baden-Württemberg it is number 5 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Sankt Leon-Rot, 7 km away (17.6 °dH).
- Nearest city with clearly harder water: Nußloch, 1 km away (31.6 °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 Wiesloch
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 22 °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 Wiesloch water hard or soft?
It is very hard: 399 mg/L as CaCO₃ (23.3 gpg, 22.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Wiesloch 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 Wiesloch water?
23.3 gpg, equal to 22.3 °dH, 39.9 °fH or 399 mg/L calcium carbonate.
What dishwasher salt setting should I use in Wiesloch?
For 399 mg/L (22.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Wiesloch?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Wiesloch, Ergebnisse der Trinkwasseranalysen 2024 (Messwerte vom 20.11.2024) (2024-11). Method: figure published by the water supplier. Stadtwerke Wiesloch, Ergebnisse der Trinkwasseranalysen 2024 (Messwerte vom 20.11.2024) · Outdated figure? Tell us