['Water Programs']

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

11/24/2025

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Drinking Water MCLs for PFAS Chemicals — Hawaii

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Drinking Water MCLs for PFAS Chemicals — Hawaii

RegSense State Info Hawaii Water Analysis Water Reporting Water Programs Toxic Water Pollutants Maximum Contaminant Levels Best Results Environmental Water Monitoring Water Programs English Focus Area CWA Compliance

Hawaii follows the federal Maximum Contaminant Levels (MCLs). 

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

However, state-specific guidance sets non-enforceable standards that are stricter than federal standards. Hawaii has published Environmental Action Levels (EALs) for more than 20 PFAS compounds, including PFOA and PFOS. When an EAL is exceeded, it warrants further evaluation. The state has established drinking water EALs for both PFAS. 

See the HIDOH Interim PFAS Guidance for the state’s EALs

Related information

Safe Drinking Water Act ezExplanation 
Drinking water (SDWA) ezExplanation 
HIDOH Per- and Polyfluoroalkyl Substances (PFASS)

Citations

HIDOH Interim PFAS Guidance 
Federal regulation 40 CFR Part 141 
Federal regulation 40 CFR Part 142 
Federal regulation 40 CFR Part 143

['Water Programs']

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

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