Not for high-rise apartments/dorm rooms. SOURCE: Lived in same on and off for ~ 20 years. The dorm only got water up to the 3rd floor via gravity (that's where the toilets started to flush properly. Above that level they all turned into way-way-way-too shallow porta potties). Much later, neither of the high-rise apartments I lived in got water if the power went out. Or, at least, not for very long.