In 7 years we have used the city water hookup when it was available, otherwise used our tank. We always keep some water in our tank in case water does get shut off. Some people ONLY drink bottled water and never even try the available source to see how it is. This year we are in Arizona and we use city hookup for showers and buy drinking water for drinking,coffee and cooking. The well water here contains higher levels of salt, arsenic and floride which is removed by city water plants, but we have been on well water at the parks where we have stayed. This is the first time in 7 years full-time that we have purchased water and not used out of the tap. We have a whole house filter.