Random thoughts just popped in my head and I just remembered that all the water in a given city is all centralized. Just add poison and boom, eradicated an entire city who are full of dissidents/opposition as punishment for voting the “wrong” way, or for a protest, or if the population is filled with “filthy undesirable [Insert Racial Group Here]”, or something like that.
Kinda unsettling to see that we are all just attached to “the grid” 😖
Genocide is unlikely as people can stop drinking after finding out it is poisonous, especially if the poison is fast acting. There has been many cases of industrial mining companies poisoning rivers.
River ecocide will probably alert the authorities first. https://www.waternz.org.nz/Story?Action=View&Story_id=2427
It has to be a slow acting poison and not easily detectable or something so new that no one knows about… yet. Example…PFAS - https://www.youtube.com/watch?v=SC2eSujzrUY
Seems like there has been break-ins though to water supply - https://www.linkedin.com/posts/elisabethbraw_is-russia-trying-to-poison-finlands-water-activity-7251250484294873088-d2YP