it goes to water treatment plant, from water treatment plant to river... where the hell do you think our waste water goes?? go and drink the water from the water treatment plant! No?? well then what the hell is the difference!!??
A modern wastewater treatment plant discharges cleaner water than the river/lake/ocean it's discharging into. Even not-so modern plants' discharge is no worse than the receiving body of water.
What ... do you honestly think the treatment plant doesn't do anything?
I don't know why you're making excuses for this third-world barbarian. His conduct is inexcusable. So is yours.