Flushing fresh water was never a good idea.
Bill Gates is backing the waterless toilet of the future — here's how it works

In developing countries, access to public utilities like running water and sewer systems are often not available. The lack of those resources leads to unsanitary conditions that can put people's lives at risk. Researchers at Cranfield University hope to put an end to that with the waterless Nano Membrane Toilet.

It may be something we will have to look at in Cape Town with the worsening drought as Cape Town is flushing lots of drinking water down into it's sewers.

See http://www.businessinsider.com/waterless-toilet-future-backed-bill-gates-foundation-2017-5
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