The water in the tank is just tap water.
Sounds like the old time water wars out west. Hundreds of men and woman died trying to control the water for their live stock. People up hill of a stream dammed the flow for themselves. The neighbors down hill watched as the livestock died.
Water is no longer safe, the run off of pesticides and what ever makes it dangerous to drink from any stream.
Outside the house any water has to be boiled an a few drops of Clorox In side the home any odd smell needs to get the water department out to check.
Back in the late 70's I was thirsty at O'Hara and the water coming out of a public water fountain was YELLOW.