Ideally, water is stored in the winter in storage lakes up North. The Snow pack in the Sierra Nevada mountains provides water from snow melt....When there is enough snow in the winter to make a good snow pack!
Sadly these two things have not been in abundance for the past two years. The estimated runoff from the Sierras was much smaller than normal because the parched ground absorbed most of it. There was not enough rain to fill Lake Shasta so it is nearly empty too. The other lakes are in a similar situation.
In Woodland, water is coming from wells. That is not good since well water is of very poor quality here because of the over pumping and agricultural waste, motley nitrates in it. It also makes the land sink.
This is in the Central valley but we are sinking here too:
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