Water hardness in Sankt Leon-Rot
17.6 °dH very hard
Tap water in Sankt Leon-Rot is very hard: 17.6 °dH (314 mg/L · 18.4 gpg · 31.4 °fH).
Source: Wassergewinnungszweckverband (WGZ) – TrinkwVO-Veröffentlichung, Stand 04.02.2026, Analyse Institut Kuhlmann (2026) · data checked 2026-10-29
The Wassergewinnungszweckverband that supplies St. Leon-Rot, Mühlhausen, Rauenberg and Malsch published its drinking water results on 4 February 2026. The analysis by Institut Kuhlmann gives 314.2 mg/L CaCO₃, with calcium at 101 mg/L and magnesium at 15.2 mg/L. That is very hard, close to Schwetzingen (360.3 mg/L), so scale protection is useful.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 17.6 °dH |
|---|---|
| Calcium (mg/L) | 101 |
| Magnesium (mg/L) | 15.2 |
| mmol_l | 3.15 |
| Utility | Wassergewinnungszweckverband St. Leon-Rot/Mühlhausen/Rauenberg/Malsch |
How Sankt Leon-Rot compares
- Tap water in Sankt Leon-Rot is 53 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 164 of 809 in Germany (1 = hardest); 80 % of these cities have softer water.
- In Baden-Württemberg it is number 31 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Karlsdorf-Neuthard, 15 km away (7.9 °dH).
- Nearest city with clearly harder water: Nußloch, 7 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 Sankt Leon-Rot
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 Sankt Leon-Rot water hard or soft?
It is very hard: 314 mg/L as CaCO₃ (18.4 gpg, 17.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sankt Leon-Rot 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 Sankt Leon-Rot water?
18.4 gpg, equal to 17.6 °dH, 31.4 °fH or 314 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sankt Leon-Rot?
For 314 mg/L (17.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Sankt Leon-Rot?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wassergewinnungszweckverband (WGZ) – TrinkwVO-Veröffentlichung, Stand 04.02.2026, Analyse Institut Kuhlmann (2026). Method: figure published by the water supplier. Wassergewinnungszweckverband (WGZ) – TrinkwVO-Veröffentlichung, Stand 04.02.2026, Analyse Institut Kuhlmann · Outdated figure? Tell us