It's just plain puzzling as to how Californians can use so much more residential water per person per day (a lot of it is probably the passion for really green lawns). If the complaint is that residential use is "only 20%" of total water usage, then reducing to Melbourne levels would mean you would save ~15% of that 20% - and a ~15% total reduction in water use by all sources is definitely worth doing.
[1]http://greencitiescalifornia.org/best-practices/water/sacram... [2]http://www.melbournewater.com.au/waterdata/wateruse/Pages/de...
Edit: This article has some more data points for residential use in different cities in California, ranging from a low of 46 gallons per day, up to 580 gallons per day(!!). 46 gpd is around the 160 litres for Melbourne above. 210gpd for Sacramento seems to be mid-range.
http://www.latimes.com/local/california/la-me-1105-californi...
California's big cities tend to come in closer to Melbourne, or, in some cases, lower. The water districts cited at the top of that L.A. Times article cover huge areas, not, in most cases, individual cities, and some of those numbers likely do include agricultural use (not to mention golf courses and other questionable uses), despite the way they are presented.
It's weird that you're using both higher and lower population density ('more agriculture') as arguments for legitimately using more water. Also, I'm not sure if you know that Melbourne also has plenty of agriculture within it's city limits, lots of market gardens, and some farms out east. As for golf courses, Melbourne is somewhat known for it's "sand belt", an area full of golf courses because land is crap for anything else[1].
But no matter how much hand-waving you do, there's still only a couple of areas in California use as little water as Melbourne does, none use less, and plenty of it uses much, much more. Compton uses nearly 50% more water than the Melbourne average - where are it's agricultural industry and golf courses? Beverly Hills uses more than four times as much as Compton, and it has no agriculture or golf courses either (though it is next to one)
The point is that Melbourne is a perfectly workable city, and it gets by on a fraction of the per-capita residential use water that Californians do. Californian residents consume a phenomenal amount of water.
The most useless usages of water would naturally disappear if water were sufficiently expensive. A glass of water at $0.30, a washing cycle at $8... so what? Watering some lawn for $30 a day? Ok lawnlords would finally get it.
You could say that at this price, agriculture wouldn't be possible. And, ehm, that's quite an accurate picture of the reality constraints: Given your drought, it's foolish to do so much local agriculture. You may need to do it offshore and import it, probably by ocean cargo. There's a point where petrol is "cheaper" than water, but only the rise of the water market will make the optimal optimizations.
About the only things I could do to reduce my own water use at this point would be to drain the pool (or maybe build a structure around it to reduce evaporation), replace the hot water heater, and reduce personal hygiene to nearly-unacceptable levels. The best part, though, is that none of that would reduce my water bill by a significant amount for at least six months (because most of the bill is a calculated charge for sewage treatment based on the previous year's water use), and the city will probably still find a way to justify power-washing the trolley station every other week.
Even better, though, is that most of the agriculture in California is certainly not local in any sense of the word (other than the sense that it happens here). The majority of the agriculture is for export, either to the rest of the U.S. or the rest of the world, because you can't import climate, but you can import water (or force everyone else to do so while the corporate farms suck up the groundwater) and labor.
Once this is said, lawmakers can complain all they want about depleted water resources. It sounds like "let's take water from citizens and give it to farms"...
In my country:
- Left wing politics are about increasing taxes on the rich to redistribute to social systems,
- Right wing politics is about making things simpler for companies, including lower taxes,
- Capitalist ecologists (which I'm trying to find a better name for) are about transferring taxes onto rare/polluting resources to integrate the side effects of those resources. Example: If petrol provokes greenhouse gases, we should tax petrol enough so that people would use it in reasonable amounts only. Thanks to this new revenue stream for the government, we can lower the taxes on employment (which are above 50% here), because taxes on employment lower the demand for employment and that has been a stupid thing to do. Instead of taxing employment, let's get the same taxes from nasty resources like petrol.
It's all explained in detail in some books (in France, Jancovici is the leader for those), but I don't know whether there's an international name for that.
... Survive?
I mean that's the goal of it, it's to decrease the consumption of this resource if it's considered harmful to the biodiversity (in the case of petrol) or wasted (in the case of water). At no point is the goal is to make the govt richer, that's why I said income tax should be reduced thereasmuch.
Cutting down that 9% makes a difference.
However, I do agree with you. Ag and food corporations need to do their share as well under regulation.
We need food of some kind, yes. We do not need massively water-hungry high margin crops such as pistachios and almonds being grown in the middle of the desert during the worst drought in centuries.