City Council and Concurrent Authorities
September 23, 2025

2025 WATER QUALITY

PUBLIC HEALTH GOALS REPORT
City Council Meeting
September 23, 2025
Agenda Item 15.2
Public Health Goals ReportReport is prepared once every 3 yearsMeets Regulatory Requirement for community water systems of more than 10,000 customers Public Hearing held to accept and respond to public comment

BackgroundCal-EPA Office of Environmental Health Hazard Assessment (OEHHA)Public Health Goals (PHGs)US Environmental Protection Agency (USEPA)Maximum Contaminant Level Goals (MCLGs)Report contains information about contaminants detected above goalsWhat actions taken to reduce constituents below PHGs Report - Water Quality DataConstituents that exceeded a Public Health Goal (PHG) or Maximum Contaminant Level Goal in calendar years 2022-2024Arsenic Bromate RadionuclidesGross Alpha Radium-228 UraniumTotal Coliforms (MCLG 0 Samples, MCL < 5%) 145-186 Samples pass each month.City’s water supply met all state and federal water quality standards ArsenicArsenic naturally occurs in groundwater supplies.Results above the Maximum Contaminant Level MCL have a possible link to cancerRegulatory standard (MCL) is 10 parts per billionPublic Health Goal is 0.004 parts per billionArsenic cannot be detected at the PHG levelMaximum test result was 6.4 parts per billion106.40.0040246810ArsenicMCLResultPHG Best Available Technologies and Treatment CostsReverse Osmosis Treatment Image Source: https://www.marlo-inc.com/news/1000-gpm-reverse-osmosis-ro-system

Estimated Fiscal Impact to CustomersCustomer impact to treat constituents below the PHG$1,932 per year per customer$161 per monthHealth protection benefits of treatment to Public Health Goals or below is not clear and may not be quantifiable

Public MeetingsReport recommended by Water Advisory Group and Council Water CommitteePublic Hearing noticed in the Stockton Record2025 Public Health Goals Report posted on the City website (stocktonca.gov)

RecommendationReceive public comment on Public Health Goals ReportResolution to Accept 2025 Water Quality Public Health Goals Report