Water hardness in Coesfeld
10 °dH hard
Tap water in Coesfeld is hard: 10 °dH (179 mg/L · 10.4 gpg · 17.9 °fH).
Source: Stadtwerke Coesfeld Wasserqualitaet, Gesamthaerte Mittelwerte 2025 (2025) · data checked 2026-10-23
Range across supply zones: 171–186 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Wasserwerk Coesfeld | 10.4 | 186 | very hard |
| Wasserwerk Lette | 9.6 | 171 | hard |
Stadtwerke Coesfeld publishes 2025 mean hardness for two waterworks: Coesfeld at 185.6 mg/L and Lette at 171.4 mg/L CaCO₃. The city figure of 178.5 mg/L is the median and lies in the hard class. With a spread of only 14 mg/L, the works that serves you makes little practical difference.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 10 °dH |
|---|---|
| Utility | Stadtwerke Coesfeld |
How Coesfeld compares
- Tap water in Coesfeld is 13 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 483 of 809 in Germany (1 = hardest); 40 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 95 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Velen, 13 km away (3.9 °dH).
- Nearest city with clearly harder water: Südlohn, 15 km away (13 °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 Coesfeld
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Coesfeld water hard or soft?
It is hard: 179 mg/L as CaCO₃ (10.4 gpg, 10 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Coesfeld 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 Coesfeld water?
10.4 gpg, equal to 10 °dH, 17.9 °fH or 179 mg/L calcium carbonate.
What dishwasher salt setting should I use in Coesfeld?
For 179 mg/L (10 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Coesfeld?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stadtwerke Coesfeld Wasserqualitaet, Gesamthaerte Mittelwerte 2025 (2025). Method: figure published by the water supplier. Stadtwerke Coesfeld Wasserqualitaet, Gesamthaerte Mittelwerte 2025 · Outdated figure? Tell us