According to the WHO, tap water is safe for consumption for 100% of the country.
There is a divide between rural and urban areas, tap water is safe to drink in 100% of urban areas, while it's only safe to drink in 99% of rural areas.
Luxembourg's tap water is safe to drink. The majority of drinking water is supplied by the reservoir Lac de la Haute Sรปre, just outside Esch-sur-Sรปre; the remainder is sourced from fresh-water springs.
According to the CDC tap water is generally safe for consumption.
According to the Numbeo water drinkability and accessibility index, tap water has a score of 79.86 / 100 (100 being best).
Numbeo considers this score to be "High"
Luxembourg is a member of the European Union which ensures tap water safety across its countries.
1 adult could save about 796$ per year in Luxembourg by drinking tap water instead of buying bottled water.
๐ณ Drinking tap water would also help with reducing your plastic footprint and improve environmental pollution.
Like in most countries, water quality and accessibility differs from location to location, therefore it's the best to check the information available on that place.