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Nepsotic already made the point I was planning on making, but it was buried in the middle of a longer post. I'm going to reiterate it to really bring it to Havoc's attention.
Literally everything you put in your mouth is toxic. Even that wonderful pure H2O you love so much. Everything depends on doses. So just saying that Flouride is toxic and therefore it's bad is a ridiculous argument to make.
Does it settle at the bottom? Is there residue? Because to me that looks like air bubbles rather than pollution. That makes extra sense given you said it varies based on what floor you're on.
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I'm gonna turn that around. Just because "everything is toxic in some quantity" doesn't mean it should be fine to just add dangerous chemicals to the water supply. And this isn't a case of "oh you'd have to drink a gazillion liters of water to get a lethal dose". No, it doesn't take all that much and in combination with other fluoride sources one might ingest, a lethal dose isn't entirely unfeasible.
But that wasn't even my core point. My point was that the government should not be the one deciding to purposefully add some chemical to the water supply for no other reason than "yeah but it's good for your teeth!". That's ridiculous and especially ironic in the US where you normally can't even see a doctor unless you have enough credit.
The reasoning to add this stuff to the water is based on some 80 year old discovery about fluoride being good for your teeth. And like many other things in the US, while the world moved on, the US clings to its old ways of doing things like a bad case of OCD.
As for chlorine, that stuff is specifically put in there to KILL stuff. And while it may not kill you, it's definitely not good for you either. And if the water comes from a natural and flowing source like a river, the water is already clean enough that simple UV light and ozone gas will disinfect it perfectly fine.
The biggest reason that the US in particular still cleans their water this way is again, because they're stuck in old ways and simply refuse to update old systems. Water towers on top of buildings, for example, are still used today and are some of the worst sources of bacterial contamination. They could easily be replaced by a pressure pump at the base of the building and eliminate the tower completely. Water pipes that haven't been replaced in 50 years is another good reason for chlorine. It's a cheap, easy and lazy stop gap solution for a problem that wouldn't exist if the pipe and pump network would be up to modern standards.
