Provisions of the California Health and Safety Code (Section 116470 [b]) specify that water systems serving more than 10,000 connections shall prepare a special report by July 1, 2025, if their water exceeds any Public Health Goals (PHGs) after each compliance period. PHGs are non-enforceable goals established by the Cal-EPA’s Office of Environmental Health Hazard Assessment (OEHHA). The statute also requires that water suppliers use the Maximum Contaminant Level Goals (MCLGs) adopted by USEPA for constituents for which OEHHA has not adopted a PHG.

There are a few constituents that are routinely detected in water systems, at levels usually well below the drinking water standards, for which no PHG or MCLG has yet been adopted (e.g., Total Trihalomethanes). These constituents will be addressed in a future required report after a PHG has been adopted.

In accordance with the Health and Safety Code (reference 1), if a constituent was detected in the water system’s supply during 2022, 2023, or 2024 at a level exceeding an applicable PHG or MCLG, it will be identified in this report. Additional information includes the numerical public health risk associated with the Maximum Contaminant Level (MCL), plus the PHG or MCLG; the category or type of risk to health that could be associated with each constituent; the best available treatment technology that could be used to reduce the constituent level; and an estimate of the cost to install that treatment if it is appropriate and feasible.