Even in rich major cities (read: NYC), where the city itself does a reasonable job monitoring water quality and updating delivery systems, buildings will often have ancient decaying lead pipes for the last 'mile' of delivery to your unit. It was only a year ago that multiple Bay Area schools found massive amounts of lead coming out of water fountains [1]. Be cognizant of your water, especially if you have kids!

[1] https://www.eastbaytimes.com/2019/05/03/oakland-unified-lead...