Rural Development has identified several programs that may help rural communities, businesses and individuals impacted by California's ongoing drought. A list of these programs and local contacts is available here.
Update 2-14-14: USDA announces $3 million in Emergency Community Water Assistance Grants are available to California's rural communities experiencing water shortages. More on the program is available here.
A comprehensive list of resources from state and federal agencies is available on the California Department of Food and Agriculture (CDFA) Drought website at http://www.cdfa.ca.gov/drought.