California Department of Public Health -- Dedicated to dedicated to optimizing the health and well-being of the people in California. There is a separate page for the Drinking Water Program (left menu).
California Environmental Protection Agency -- This agency is charged with developing, implementing and enforcing the state's environmental protection laws that ensure clean air, clean water, clean soil, safe pesticides and waste recycling and reduction.
Institute of Heating & Air Conditioning Industries -- A non-profit trade association of contractors, manufacturers, distributors, utility firms, and related businesses actively engaged in the heating, ventilation, air conditioning, refrigeration, and sheet metal industries. Includes a link to subscribe to the free industry journal Indoor Comfort News.
United States Environmental Protection Agency -- Use the A to Z index to find information on various environmental topics, such as water, sewage, waste, etc.