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City of Redwood City 2025 Public Health Goal Report 6 concern for neurobehavioral effects (in children) designated as a decrease of one Intelligence Quotient point. Best Available Technology for Lead Elimination DDW considers optimizing corrosion controls as the BAT to deal with lead in drinking water. In an evaluation report dated August 4, 2006, the SFPUC concluded that pH adjustment in the San Francisco Regional Water System, which supplies water to Redwood City, is the optimal corrosion control treatment. The report, which was then approved by the DDW, recommends a minimum pH of 8.2 (i.e. the optimal water quality parameter, or OWQP) be maintained throughout the transmission and distribution system. Because Redwood City continues to meet the Action Level for lead and operate the water system with pH greater than 8.2, DDW considers that the City has achieved optimized corrosion control. Therefore, additional corrosion control treatment is not needed. What Consumers can do to Decrease Lead Exposure Listed below are some measures consumers can take to reduce exposure to lead: • Have household water tested for lead. • Find out whether household pipes contain lead or lead solder. • Run household water for 15-30 seconds or until it becomes cold before using it for drinking or cooking; this flushes any standing lead from the pipes. • Avoid cooking with or drinking water from the hot water tap; lead dissolves more easily into hot water. • Avoid boiling water to remove lead; excessive boiling of water makes the lead more concentrated – the lead remains when the water evaporates. • Replace old fixtures or faucets used for drinking or cooking with new fixtures manufactured and sold in California after January 2010 III. SUMMARY AND CONCLUSION The drinking water in the City of Redwood City meets all standards established by California State Water Resources Control Board, Division of Drinking Water and USEPA to protect public health. Currently the best available technology is in use to control lead levels in drinking water, and no additional treatment is recommended at this time that could lower the levels of lead in a cost effective manner. However, homeowners may reduce their risk of lead exposure by following some measures to that effect. The City of Redwood City will continue to assure the protection of public health by researching and examining emerging treatment technologies on an ongoing basis while taking into account health protection benefits and cost. IV. ATTACHMENTS: A. Excerpt from California Health & Safety Code: Section 116470 (b), (c), (d), (e), and (f) B. Table of Regulated Constituent with MCL and PHG 9.B. - Page 14 of 27 203