Water hardness in Grassau
16.1 °dH very hard
Tap water in Grassau is very hard: 16.1 °dH (288 mg/L · 16.8 gpg · 28.8 °fH).
Source: Markt Grassau, Ergebnisse der Trinkwasseruntersuchung vom 24.06.2026 (Wasserwerk Grassau) (2026-06) · data checked 2026-11-05
The Grassau figure comes from the municipal water analysis of 24 June 2026 for the Grassau waterworks (Markt Grassau): 288.1 mg/L CaCO₃, about 16.1 °dH. It is computed from the published results. The document we used does not name the source the works draws on, so we make no claim about the local geology. In practice, water at this level leaves visible limescale on taps 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 | 16.1 °dH |
|---|---|
| Calcium (mg/L) | 88 |
| Magnesium (mg/L) | 16.6 |
| Utility | Markt Grassau, Wasserwerk Grassau |
How Grassau compares
- Tap water in Grassau is 40 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 218 of 809 in Germany (1 = hardest); 73 % of these cities have softer water.
- In Bayern it is number 67 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Bad Reichenhall, 32 km away (12.2 °dH).
- Nearest city with clearly harder water: Bernau am Chiemsee, 9 km away (21.5 °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 Grassau
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S2 |
| 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 Grassau water hard or soft?
It is very hard: 288 mg/L as CaCO₃ (16.8 gpg, 16.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grassau 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 Grassau water?
16.8 gpg, equal to 16.1 °dH, 28.8 °fH or 288 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grassau?
For 288 mg/L (16.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Grassau?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Markt Grassau, Ergebnisse der Trinkwasseruntersuchung vom 24.06.2026 (Wasserwerk Grassau) (2026-06). Method: computed from supplier's calcium and magnesium. Markt Grassau, Ergebnisse der Trinkwasseruntersuchung vom 24.06.2026 (Wasserwerk Grassau) · Outdated figure? Tell us