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Drinking Water MCLs for PFAS Chemicals — California

RegSenseState InfoWater AnalysisToxic Water PollutantsWater ProgramsWater ReportingMaximum Contaminant LevelsCaliforniaBest ResultsCAA ComplianceEnvironmentalWater MonitoringWater ProgramsEnglishFocus Area

California follows the federal Maximum Contaminant Levels (MCLs). 

  • PFOA: 4 parts per trillion (ppt) 
  • PFOS: 4 ppt 

However, state-specific guidance sets non-enforceable standards that are stricter than federal standards. 

California’s Office of Environmental Health and Hazard Assessment adopted the following Public Health Goals (PHGs): 

  • PFOA: 0.007 ppt, and 
  • PFOS: 1 ppt.

PHGs aren’t enforceable MCLs. However, certain public water systems that exceed a contaminant’s PHG are required to: 

  • Report information to customers about health risks and treatment costs to return to the PHG, and 
  • Hold a public hearing on the report. 

Citations

['Water Programs']
['Toxic Water Pollutants', 'Water Reporting', 'Water Analysis', 'Maximum Contaminant Levels', 'Water Programs', 'Water Monitoring']
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