Water hardness in Hameln
27.8 °dH very hard
Tap water in Hameln is very hard: 27.8 °dH (496 mg/L · 29 gpg · 49.6 °fH).
Source: Stadtwerke Hameln, Trinkwasseruntersuchung Netzprobe Hameln (Entnahme 24.07.2026) (2026-07) · data checked 2026-10-20
Stadtwerke Hameln published a network sample taken on 24 July 2026, which gives 496.2 mg/L CaCO₃. This is among the hardest values in our German data and sits just under the 500 mg/L level we check manually. It rests on one sampling date, so treat it as indicative. Softening or regular descaling is worth considering.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 27.8 °dH |
|---|---|
| Utility | Stadtwerke Hameln (stwhw.de) |
How Hameln compares
- Tap water in Hameln is 142 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 8 of 809 in Germany (1 = hardest); 99 % of these cities have softer water.
- In Niedersachsen it is number 3 of 94 cities; the regional median is 7 °dH.
- Nearest city with clearly softer water: Aerzen, 12 km away (19.1 °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 Hameln
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 28 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S4 |
| LG | H4 |
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 Hameln water hard or soft?
It is very hard: 496 mg/L as CaCO₃ (29 gpg, 27.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Hameln 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 Hameln water?
29 gpg, equal to 27.8 °dH, 49.6 °fH or 496 mg/L calcium carbonate.
What dishwasher salt setting should I use in Hameln?
For 496 mg/L (27.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Hameln?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Hameln, Trinkwasseruntersuchung Netzprobe Hameln (Entnahme 24.07.2026) (2026-07). Method: own measurement. Stadtwerke Hameln, Trinkwasseruntersuchung Netzprobe Hameln (Entnahme 24.07.2026) · Outdated figure? Tell us