Water hardness in Rehau
6.1 °dH moderately hard
Tap water in Rehau is moderately hard: 6.1 °dH (110 mg/L · 6.4 gpg · 10.9 °fH).
Source: Stadtwerke Rehau - Zahlen und Fakten, Wasserwerte (date not specified) · data checked 2026-11-12
Range across supply zones: 70–171 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Faßmannsreuth (inkl. Prex, Ludwigsbrunn, Dobeneck, Sigmundsgrün, Schanz, Schöne Aussicht) | 7.6 | 135 | hard |
| Hochbehälter I Rehau (Innenstadt bzw. tiefer gelegenes Stadtgebiet) | 3.9 | 70 | moderately hard |
| Hochbehälter II Rehau (höher gelegenes Stadtgebiet und Ortsteile) | 4.7 | 84 | moderately hard |
| Neuküschwitz (laut Seite von der Gemeinde Regnitzlosau versorgt) | 9.6 | 171 | hard |
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 6.1 °dH |
|---|---|
| Utility | Stadtwerke Rehau (operated by Veolia Wasser Deutschland GmbH) |
How Rehau compares
- Tap water in Rehau is 47 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 693 of 809 in Germany (1 = hardest); 14 % of these cities have softer water.
- In Bayern it is number 128 of 137 cities; the regional median is 15.8 °dH.
- Nearest city with clearly softer water: Eichigt, 15 km away (3.9 °dH).
- Nearest city with clearly harder water: Oberkotzau, 7 km away (7.7 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Rehau
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Rehau water hard or soft?
It is moderately hard: 110 mg/L as CaCO₃ (6.4 gpg, 6.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rehau 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 Rehau water?
6.4 gpg, equal to 6.1 °dH, 10.9 °fH or 110 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rehau?
For 110 mg/L (6.1 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Rehau?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Stadtwerke Rehau - Zahlen und Fakten, Wasserwerte (date not specified). Method: figure published by the water supplier. Stadtwerke Rehau - Zahlen und Fakten, Wasserwerte · Outdated figure? Tell us