Water hardness in Kornwestheim
11.3 °dH very hard
Tap water in Kornwestheim is very hard: 11.3 °dH (201 mg/L · 11.7 gpg · 20.1 °fH).
Source: SWLB Analyse des Trinkwassers im Versorgungsgebiet, Jahresmittelwerte 2024 (2024) · data checked 2026-10-23
Stadtwerke Ludwigsburg-Kornwestheim (SWLB) prints a mixed-water column for Kornwestheim in its 2024 annual means, 200.9 mg/L CaCO₃. A footnote describes it as the mean of two supplies, abbreviated BWV and LW in the table. No 2025 or 2026 analysis was found on the SWLB site, so the figure is from 2024.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 11.3 °dH |
|---|---|
| Utility | Stadtwerke Ludwigsburg-Kornwestheim GmbH (SWLB) |
How Kornwestheim compares
- Tap water in Kornwestheim is close to the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 426 of 809 in Germany (1 = hardest); 47 % of these cities have softer water.
- In Baden-Württemberg it is number 84 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Leonberg, 14 km away (8.9 °dH).
- Nearest city with clearly harder water: Bietigheim-Bissingen, 11 km away (17.3 °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 Kornwestheim
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Kornwestheim water hard or soft?
It is very hard: 201 mg/L as CaCO₃ (11.7 gpg, 11.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kornwestheim 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 Kornwestheim water?
11.7 gpg, equal to 11.3 °dH, 20.1 °fH or 201 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kornwestheim?
For 201 mg/L (11.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Kornwestheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SWLB Analyse des Trinkwassers im Versorgungsgebiet, Jahresmittelwerte 2024 (2024). Method: figure published by the water supplier. SWLB Analyse des Trinkwassers im Versorgungsgebiet, Jahresmittelwerte 2024 · Outdated figure? Tell us