Wastewater should be treated. And at least if you concentrate all the waste into one place, you greatly reduce the spread of infectious diseases spread by untreated waste.
Also, your children tend not to be stunted. http://www.huffingtonpost.com/sanjay-wijesekera/why-are-indi...
don't forget corpses
http://www.planetcustodian.com/2015/10/19/8134/over-50-scary...
Good protein feed for the fish, birds, crocodiles. Instead of taking up real estate.
We bury people for a reason. Or we burn them, or leave them on the land to get eaten by animals, away from water supplies. (https://en.wikipedia.org/wiki/Sky_burial)
The difference between what you're proposing is the difference between composting an animal corpse and then using it to fertilize your crops, or just grinding it up and spraying it all over your tomatoes.
Banning disposable plastic and non biodegradable detergents would go a great way in letting microbes and plants do their job in cleaning up the environment.
With plastics not clogging up the rivers and chemicals not killing all river life, the rivers would definitely run much cleaner. This move was incidentally meant to curb air pollution, so clean rivers or oceans are an added benefit.