I haven't heard of the bacteria issue but when I got into keeping shrimp it was stressed to use only cold water and let it warm up before putting it into the shrimp tank. Because warm water that goes though the hot water heater contains some metals that are harmful to shrimp. This is why I got the Kold ster IL water filter.
For your drinking water it's important to have a water filter. There are things in our water that you don't even want to know about. If you don't have a water filter YOU ARE the water filter.
I also have a filter on my shower head. Have you ever took a hot show and felt a little light headed and thought it was because the was hot? It wasn't the temperature of the water. The steam from our chlorinated water contains chlorine gas which is what the Nazis used to exterminate millions of Jews.