Nice one Ludwig, see you over there. ;)

re London water supply-- Checked out the dwi site posted by TurnLeft TR and I also could find no mention of treated sewerage-effluent going back into the water supplies for London, only treated effluent being discharged into water courses which would find its way back into the drinking water supply. Therefore, it would be nice if someone in authority could point to the relevant information re London and recycled effluent for clarification so we're all happy.
I'm opposed to it in SEQ as experts have been quite wrong about other 'safe practices' with necessity forcing implementation of quick turnaround policies after unforseen disasters. Also, human error, new exotic diseases, possible future cost cutting are all negative scenarios which are not impossible. Anyway, the narrow focus and lack of vision by our illustrious leaders and their advisors were and are factors contributing to the magnitude of the present situation. Cost is always a factor but so is unnecessary wasteful gov. expenditure which is another topic.

Isn't most of the U.K using recycled water? And have been for a very long time...
And the solution to electricity plants producing GHG is Nuclear power, but we know that will never be legal in Australia. So I guess we need to cover our desert with a wind power plant to generate enough power too keep us all happy and start growing cactus to absorb the current CO2 emissions - nothing else will stay alive in the speedy global warming.

http://www.nei.org/documents/Policy_Brief_Nuclear_Energy_A_Key_Tool_0107.pdf

If recycled water really has been commonly used elsewhere, you'd think there'd be a link to a reliable government website, somewhere, outlining this practice.
I'd really like to see one. It would be comforting.

Singapore uses NEWater which seems very similar to the recycling system proposed for SEQ. They only introduce 1% into their reservoirs with plans to add 2.5%--Here is a link to their FAQ page.

http://www.pub.gov.sg/NEWater_files/faq/index.html

What are the proposed introduction figures here? Also, I'm always very skeptical about the wisdom of simply adopting methodologies from very different climatic-rainfall areas as per lessons from the past.

digiwigi-

The Premier has been asked what the percentage will be, though he has strictly ruled out any cap on the water. So effectively, it will depend on how much rain is in Wivenhoe.

If we had plenty of water there, we wouldn't need the recycled water, so I'm guessing the percentage is going to be quite high.