To see that human wastes do ...

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To see that human wastes do not pollute the rivers, I suggest a bunch of following inter-related programmes:

1. Control leakage of water from water distribution system after which supply of safe water 24x7 is possible.

2. In all new area development and large constructions, adopt dual plumbing at the supply side to reduce freshwater demand and on the outflow side to make it possible to use treated wastewater to flush toilets. Further, it can be used also for landscaping and cooling centralised air conditioning systems.

3. Strictly follow the principle that used water -- treated or untreated -- shall not be allowed to reach the river. Once a principle is set, engineering solutions are also found.