According to the WHO, tap water is safe for consumption for 90% of the country.
Pulpulak drinking water fountains are located all over Armenia and frequently used by locals and travellers alike. However, there is little if any filtration outside of Yerevan, so some may choose to avoid taking the risk. In these cases, bottled water is widely available.
According to the CDC tap water is generally not safe for consumption.
According to the Numbeo water drinkability and accessibility index, tap water has a score of 77.68 / 100 (100 being best).
Numbeo considers this score to be "High"
1 adult could save about 358$ per year in Armenia 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.