Case Study | April 30, 2014

High-Power UV Lamps Lower Replacement Costs, Reduce Maintenance

Source: Calgon Carbon Corporation

The Tesla Water Treatment Facility is located in Tracy California approximately 60 miles west of San Francisco in the Central Valley of California. Since 1934, San Francisco has received water from the Hetch Hetchy Reservoir in Yosemite National Park via the 167 mile long Hetch Hetchy Aqueduct. Due to the pristine nature of the water source, the water is unfiltered and was only chlorinated at the 75 year old Tesla Portal facility. The water supply and treatment is operated by the San Francisco Public Utilities Commission (SFPUC) and provides potable water to 2.5 million people in the San Francisco Bay Area. Due to the US Environmental Protection Agency (USEPA) Long Term 2 Enhanced Surface Water Treatment Rule (LT2) that requires secondary disinfection for control of Cryptosporidium in unfiltered water sources, SFPUB initiated a project to build a new facility using ultraviolet disinfection (UV) with post chlorination prior to distribution. Cryptosporidium is a chlorine resistant pathogenic protozoan known to have caused millions of illnesses worldwide that is easily inactivated by exposure to germicidal UV light.