Water hardness in Geisenheim
9.1 °dH hard
Tap water in Geisenheim is hard: 9.1 °dH (163 mg/L · 9.5 gpg · 16.3 °fH).
Source: Stadtwerke Geisenheim – Regelmäßige Informationen zur Trinkwasserqualität (Wasserhärte vom 23.11.2025) (2025) · data checked 2026-10-29
Range across supply zones: 105–264 mg/L.
6 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Geisenheim | 14.8 | 264 | very hard |
| Johannisberg Hochzone | 7.2 | 129 | hard |
| Johannisberg Mittelzone | 11.1 | 198 | very hard |
| Johannisberg Tiefzone | 12.1 | 216 | very hard |
| Marienthal | 5.9 | 105 | moderately hard |
| Stephanshausen | 6.1 | 109 | moderately hard |
Stadtwerke Geisenheim's hardness sheet of 23 November 2025 lists six zones from 105.3 mg/L CaCO₃ in Marienthal to 264.2 mg/L in Geisenheim. Johannisberg has three zones: Hochzone at 128.5 mg/L, Mittelzone at 198.1 mg/L and Tiefzone at 216.0 mg/L. The city figure of 163.3 mg/L is a median, so which zone you live in decides the water.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 9.1 °dH |
|---|---|
| mmol_l | 1.1 |
| Utility | Stadtwerke Geisenheim |
How Geisenheim compares
- Tap water in Geisenheim is 20 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 513 of 809 in Germany (1 = hardest); 37 % of these cities have softer water.
- In Hessen it is number 45 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Niedernhausen, 32 km away (5.2 °dH).
- Nearest city with clearly harder water: Eltville am Rhein, 12 km away (18.4 °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 Geisenheim
| 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 Geisenheim water hard or soft?
It is hard: 163 mg/L as CaCO₃ (9.5 gpg, 9.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Geisenheim 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 Geisenheim water?
9.5 gpg, equal to 9.1 °dH, 16.3 °fH or 163 mg/L calcium carbonate.
What dishwasher salt setting should I use in Geisenheim?
For 163 mg/L (9.1 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Geisenheim?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stadtwerke Geisenheim – Regelmäßige Informationen zur Trinkwasserqualität (Wasserhärte vom 23.11.2025) (2025). Method: figure published by the water supplier. Stadtwerke Geisenheim – Regelmäßige Informationen zur Trinkwasserqualität (Wasserhärte vom 23.11.2025) · Outdated figure? Tell us