According to the WHO, tap water is safe for consumption for 100% of the country.
There's absolutely no need to buy bottled water in Slovakia, the tap water is safe to drink โ good news for wallets and for the environment. Other than instances where a crossed-out warning symbol is posted above a tap (for example, in some public toilets) you can expect water issuing from taps to be potable. Travellers prone to upset stomachs may choose to bring a portable water filter for peace of mind when drinking tap water.
Note that mineral-rich waters are highly prized in Slovakia, and in spa towns you are likely to see locals queuing to fill containers with water piped from underground sources. Because of the mineral content, this water can be warm, fizzy or with a strong metallic taste. Travellers unused to it may find that these mineral waters cause nausea. Limit yourself to a few sips if you have a delicate stomach.
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 85.75 / 100 (100 being best).
Numbeo considers this score to be "Very high"
Slovakia is a member of the European Union which ensures tap water safety across its countries.
1 adult could save about 489$ per year in Slovakia 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.