US Environmental Protection Agency: Ground Water and Drinking Water
The EPA’s Office of Ground Water and Drinking Water (OGWDW) presents information including local drinking water quality, source water protection and drinking water standards.

Federal Regulation:  Title 40 - Protection of the Environment
A list of federal regulations regarding the EPA’s water programs.

Department of Public Health: Public Drinking Water Systems
The California Department of Public Health presents information including drought preparedness and water conservation.