According to the WHO, tap water is safe for consumption for 99% of the country.
The tap water in Chile's cities is generally safe but has a high mineral content that can cause stomach upsets; bottled water is a good idea for delicate stomachs and in the north. Vigorous boiling for one minute is the most effective means of water purification. At altitudes greater than 2000m, boil for three minutes. You can also disinfect water with iodine pills, a water filter or Steripen.
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 56.54 / 100 (100 being best).
Numbeo considers this score to be "Moderate"
1 adult could save about 781$ per year in Chile 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.