Groundwater withdraw issues in Cali 
http://news.nationalgeographic.com/news/2014/08/140819-groundwater-california-drought-aquifers-hidden-crisis/
Great resource from the EPA over groundwater contamination. ~7 pages of text, but really good information. 9/10 would recommend:
https://www.epa.gov/sites/production/files/2015-08/documents/mgwc-gwc1.pdf 
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