Have look at:
https://pdfs.semanticscholar.org/56a1/0f80d36b05aa025a41efe2c4b3f884ccf5d5.pdf
Israel, considering what they do with the limited fresh water available to them.
In terms of mature markets, anywhere there is severe scarcity; California comes to mind. Other intensive greenhouse jurisdictions that are under heavy legislative pressure are also improving regardless of the level of scarcity. Canada, specifically the Province of Ontario, has enacted tough regulations on (primarily) irrigation wastewater discharge but also on water taking. This legislative as well as supply pressure has lead to significant R&D and improvements are being made in terms of recycling and post production treatment. -- If you produce a publication comparing international greenhouse production in terms of water use efficiencies please post on RG!
I would say that there are isolated examples all over the world, with great agricultural water management principles, in either greenhouse or fully controlled agriculture settings. Netherlands, Japan, Canada, Israel, Saudi Arabia, Australia, and some US states come to mind, but there are operations in Germany, UK, and more, that use recirculating systems, reclaimed water, smart irrigation etc., so don't forget about those isolated examples.
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