Comment: Water subsidy for agriculture (Score 3, Insightful) 376
Part of the problem is the traditional large subsidy that agricultural water gets (both via the infrastructure costs and in direct pricing). Farming would make better use of water if it had to pay the price.
PS: "Olympic-size swimming pools per year" is a strange way to measure water usage. "about 6.8 cubic metres per day" is a much clearer way to express this number. In particular, this makes it clear that low-flow toilets have a negligible effect on water use compared to dishwashing, showers, etc.