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Probably since the early eighties. Our water comes from the Colorado river. It gets sucked up by agriculture If you take a look at lake Meade you will see why.
This article is pretty demonstrative. the pictures take a while to load but once they load there is a bar between them you can slide back and forth comparing water levels.
Lake Mead before and after link
if you take a look at the bands of white on the rocks representing long term water levels... there is a very faint one above the all white ones probably the first water level for the lake.... I would say the water has gone down a good two hundred feet...
The images of before and after only cover a seven year span...
Our own water supply is tenuous any way because we depend solely on water from the Colorado and our own reservoirs. That depended on an annual rain fall of fifteen inches or more. We have had three inches of rain per year for the past two. Before that It was about six. At six the desert in my area stopped blooming in the spring.
In the future it wont be global warming or natural disasters or ecological disasters it will be lack of water that does us in.
Reservoirs in California before and after link
Saddest thing is San Diego is known for its zoos and animal conservation... Bringing species back from the brink of extinction... What we aren't known for is the fact that we have the largest botanical collections throughout the country.... Some species are completely extinct in their own habitat. You cannot find them any where but in San Diego botanical gardens both public and private.
deb
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you've all had more than your share for ten years I think. Stay safe and warm and I hope your electricity doesn't go out. 
