['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 — District of Columbia

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Drinking Water MCLs for PFAS Chemicals — District of Columbia

RegSense Water Analysis Toxic Water Pollutants Water Programs Environmental Protection Agency (EPA)Maximum Contaminant Levels Water Programs CWA Compliance English District of Columbia State Info Water Reporting Best Results Environmental Water Monitoring Focus Area

The District of Columbia follows the federal Maximum Contaminant Levels (MCLs).

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

The district doesn’t have existing or planned PFAS standards for drinking water but is committed to meeting the federal requirements.

Related information

Safe Drinking Water Act ezExplanation
Drinking water (SDWA) ezExplanation 
DC Water: PFAS and Drinking Water

Citations

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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