The water hardness in Darmstadt - Kranichstein (64289) is approx. 17 °dH and is therefore hard in the hardness range.
With hard water, there is a risk of lime forming in your household appliances and piping.
You can lower the water hardness with a water softening system.
This value was calculated from the neighbour cities.
The average water hardness in Hessen is 17 °dH.