Water hardness in Ottobrunn bei München
17.5 °dH very hard
Tap water in Ottobrunn bei München is very hard: 17.5 °dH (312 mg/L · 18.2 gpg · 31.2 °fH).
Source: Gemeinde Ottobrunn, Messwerte des Trinkwassers (Wasserversorgung) (2026-02) · data checked 2026-11-03
The municipal waterworks of Ottobrunn publish one value for the whole municipality: 17.5 °dH, hardness range III (hard), as of February 2026. The page gives no breakdown by district and no mmol/L figure. The municipality lies in the Munich area, where tap water is generally on the hard side. At this level, scale in kettles and on taps builds up quickly, and a softener or descaler is worth pricing.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 17.5 °dH |
|---|---|
| Utility | Eigenbetrieb Wasserversorgung Ottobrunn |
How Ottobrunn bei München compares
- Tap water in Ottobrunn bei München is 52 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 165 of 809 in Germany (1 = hardest); 79 % of these cities have softer water.
- In Bayern it is number 53 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Karlsfeld, 23 km away (2.6 °dH).
- Nearest city with clearly harder water: Tuntenhausen, 33 km away (23.9 °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 Ottobrunn bei München
| 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 Ottobrunn bei München water hard or soft?
It is very hard: 312 mg/L as CaCO₃ (18.2 gpg, 17.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ottobrunn bei München 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 Ottobrunn bei München water?
18.2 gpg, equal to 17.5 °dH, 31.2 °fH or 312 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ottobrunn bei München?
For 312 mg/L (17.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ottobrunn bei München?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gemeinde Ottobrunn, Messwerte des Trinkwassers (Wasserversorgung) (2026-02). Method: figure published by the water supplier. Gemeinde Ottobrunn, Messwerte des Trinkwassers (Wasserversorgung) · Outdated figure? Tell us