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City of Redwood City 2025 Public Health Goal Report 1 I. BACKGROUND The City of Redwood City is required by the California Health and Safety Code to prepare a report regarding Public Health Goals. Section 116470 (b), (c), and (f) of the Health and Safety Code (see Attachment A) specifies that on or before July 1, 1998, and every three years thereafter, public water systems serving more than 10,000 service connections shall prepare a report that is intended to inform the public of any California Public Health Goal (PHG) exceedance that occurred within the prior three years. A PHG is a non-enforceable goal established by the California Environmental Protection Agency’s Office of Environmental Health Hazard Assessment (OEHHA) and is not to be confused with Maximum Contaminant Level (MCL). An MCL is the enforceable level of a contaminant that is allowed in drinking water and are set by the US Environmental Protection Agency (USEPA) or the California State Water Resources Control Board Division of Drinking Water (DDW). Section 116470 of the California Health and Safety Code states that, if, a contaminant was detected by a water supplier between 2022 and 2024, at a level exceeding an applicable PHG, the PHG reports are to provide the information required by the law. The required information includes: 1. The identification of each contaminant detected in drinking water that exceeds the applicable PHG. 2. The MCL and PHG as determined by OEHHA for each contaminant identified. 3. The category or type of risk to health that could be associated with each contaminant identified. 4. The best treatment technology commercially available, if any, that could be used to reduce the contaminant level. 5. An estimate of the cost to utilize that treatment if it is appropriate and feasible. 6. A description of the action, if any, public water systems intend to take to reduce the concentration of the contaminant. Constituents that have a California primary drinking water standard and for which a PHG has been set are to be addressed in the report. Attachment B contains the regulated constituent (lead) for which the City of Redwood City exceeded the PHG. Please note that water containing lead is not delivered to consumers through the City water distribution system, but rather, it is a product of constituents leaching from fixtures containing lead within consumer’s homes. A more detailed explanation of this occurrence is given later in the report. The Code further specifies that a public hearing is to be held for the purpose of accepting and responding to public comment on the report. The hearing can be part of any regularly scheduled meeting. Please also note that in subsection (f) the requirement that maximum contaminant level goals (MCLGs) adopted by the U.S. Environmental Protection Agency (USEPA) must be used if a PHG has not been adopted for a regulated contaminant. 9.B. - Page 9 of 27 198