Water hardness in Leonberg
8.9 °dH hard
Tap water in Leonberg is hard: 8.9 °dH (159 mg/L · 9.3 gpg · 15.9 °fH).
Source: Stadtwerke Leonberg Die wichtigsten Trinkwasserparameter 2026 (PDF) (2026) · data checked 2026-10-20
Stadtwerke Leonberg's 2026 parameter sheet reports 158.9 mg/L CaCO₃, in the hard category. No range is published for the city. Limescale is likely to show on kettles and glassware over time.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 8.9 °dH |
|---|---|
| Utility | Stadtwerke Leonberg |
How Leonberg compares
- Tap water in Leonberg is 23 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 539 of 809 in Germany (1 = hardest); 33 % of these cities have softer water.
- In Baden-Württemberg it is number 122 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Neubulach, 28 km away (3.5 °dH).
- Nearest city with clearly harder water: Sindelfingen, 10 km away (16.5 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Leonberg
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Leonberg water hard or soft?
It is hard: 159 mg/L as CaCO₃ (9.3 gpg, 8.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Leonberg 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 Leonberg water?
9.3 gpg, equal to 8.9 °dH, 15.9 °fH or 159 mg/L calcium carbonate.
What dishwasher salt setting should I use in Leonberg?
For 159 mg/L (8.9 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Leonberg?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stadtwerke Leonberg Die wichtigsten Trinkwasserparameter 2026 (PDF) (2026). Method: figure published by the water supplier. Stadtwerke Leonberg Die wichtigsten Trinkwasserparameter 2026 (PDF) · Outdated figure? Tell us