If you're worried about animal fecal matter making it into the waterways, I have bad news about fish

Lol, this is not anything new or crazy - All of NA infrastructure is built the same way. I'd be surprised if there were many places in the world that weren't built this way.

Even if nationalised, our water infrastructure still needs hundreds of billions of pounds investing in it to bring it up to an acceptable standard, and the government doesn't have the money and has other priorities to spend it on if they magically got a surprise pile of cash. The only financially viable way to fix the problem in a hurry would be to seize past dividends from water company shareholders to cover the cost of doing the things the water companies were supposed to be doing (which would conveniently tank the share prices and make nationalising the water much cheaper), but lots of pensions are propped up mostly by water shares, so doing that would plunge lots of pensioners into poverty, which isn't politically viable as the government's already in enough trouble for perceived being mean to pensioners, and they can't afford to support more impoverished pensioners.

HEYOOOO

There is not. Obviously I can't speak for every city in the world but any I'm familiar with either flow back to natural water sources, or to storm ponds to slowly evaporate/become ground water

It's privatised. It's paid for by taxes, but most local authorities put it out to tender and private companies bid for the contract. So, ultimately, some public money ends up in the pockets of shareholders.

I'm not sure if it's an admirable trait to double down on your ignorance, but I'm kind of impressed by your willingness to do it in front of everyone.