Water hardness in Eisenach
18 °dH very hard
Tap water in Eisenach is very hard: 18 °dH (321 mg/L · 18.8 gpg · 32.1 °fH).
Source: TAV Eisenach-Erbstromtal, Trinkwasserhärte Übersicht (2026-10) · data checked 2026-10-29
Range across supply zones: 232–411 mg/L.
17 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Berteroda | 18 | 321 | very hard |
| Eisenach – Nordbereich | 18.5 | 330 | very hard |
| Eisenach – Südviertel | 14 | 250 | very hard |
| Eisenach – Wartenberg oberer Teil | 21 | 375 | very hard |
| Eisenach – Wartenberg unterer Teil | 17.5 | 312 | very hard |
| Eisenach – Zentrum | 14 | 250 | very hard |
| Göringen | 20 | 357 | very hard |
| Hörschel | 20 | 357 | very hard |
| Hötzelsroda | 18 | 321 | very hard |
| Madelungen | 18 | 321 | very hard |
| Neuenhof | 20 | 357 | very hard |
| Neukirchen | 18 | 321 | very hard |
| Petersberg, Hofferbertaue | 17 | 304 | very hard |
| Stedtfeld | 20 | 357 | very hard |
| Stockhausen | 18 | 321 | very hard |
| Stregda | 17.5 | 312 | very hard |
| Wartha | 20 | 357 | very hard |
TAV Eisenach-Erbstromtal splits Eisenach and its villages into 17 zones, and the computed city figure of 321.3 mg/L CaCO₃ sits inside a range of 232.1 to 410.6 mg/L. Eisenach – Zentrum and Südviertel are at the lower end (249.9 mg/L), while the upper Wartenberg is at 374.9 mg/L. The zone table on the utility's page is the better guide than the city number.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 18 °dH |
|---|---|
| Utility | TAV Eisenach-Erbstromtal |
How Eisenach compares
- Tap water in Eisenach is 57 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 148 of 809 in Germany (1 = hardest); 81 % of these cities have softer water.
- In Thüringen it is number 3 of 8 cities; the regional median is 16.5 °dH.
- Nearest city with clearly softer water: Ruhla, 10 km away (4.5 °dH).
- Nearest city with clearly harder water: Creuzburg, 9 km away (25.5 °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 Eisenach
| 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 Eisenach water hard or soft?
It is very hard: 321 mg/L as CaCO₃ (18.8 gpg, 18 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Eisenach 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 Eisenach water?
18.8 gpg, equal to 18 °dH, 32.1 °fH or 321 mg/L calcium carbonate.
What dishwasher salt setting should I use in Eisenach?
For 321 mg/L (18 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Eisenach?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: TAV Eisenach-Erbstromtal, Trinkwasserhärte Übersicht (2026-10). Method: computed from supplier's calcium and magnesium. TAV Eisenach-Erbstromtal, Trinkwasserhärte Übersicht · Outdated figure? Tell us