According to the WHO, tap water is safe for consumption for 50% of the country.
There is a divide between rural and urban areas, tap water is safe to drink in 59% of urban areas, while it's only safe to drink in 21% of rural areas.
Tap water in Peru is not safe to drink. Boiling water vigorously for one minute is the most effective means of water purification. At altitudes over 2000m (6500ft), boil for three minutes.
You can also disinfect water with iodine or water-purification pills or use a water filter or Steripen. Consult with outdoor retailers on the best option for your travel situation.
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 39.32 / 100 (100 being best).
Numbeo considers this score to be "Low"
1 adult could save about 679$ per year in Peru 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.