No you asked a question unrelated to the discussion in motion so you can reinforce the world view you were brainwashed with as a child.
No, there is no example of a large stateless society with large infrastructure, because people like you love committing genocide whenever anyone is not under your control.
The original question implied was is government required for infrastructure, and the answer is unambiguously no.
Sanitation in Rome was open sewer lines yes, that had constantly flowing water that removed waste in the gutter. Also closed sewer lines nes that removed waste from people’s houses. Depending on the era you want to try to claim this in. At no point were people just throwing waste into the street and leaving it there. That was just an English thing.