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Lead and Copper Rule Compliance for San Francisco

Trussell Technologies was retained to address appropriate Lead and Copper Rule corrosion control treatment and water quality parameters (WQPs) after SFPUC implemented system-wide chloramination and system-wide fluoridation in 2004-05. The existing corrosion control treatment (CCT), pH adjustment, was compared to practices (e.g. pH/alkalinity adjustment, phosphate inhibitor) at U.S. cities treating similar soft, low alkalinity water supplies. The project also looked at impacts on aging, concrete-lined piping in the Hetch Hetchy aqueduct. As a result, CDPH approved pH adjustment as CCT, reduced the pH WQP from 8.5 to 8.2, and eliminated Langelier Index as a WQP, saving SFPUC millions.