['Water Programs']

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

11/25/2025

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Drinking Water MCLs for PFAS Chemicals — Pennsylvania

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Drinking Water MCLs for PFAS Chemicals — Pennsylvania

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

Pennsylvania has state-specific Maximum Contaminant Levels (MCLs) and MCL goals for PFAS in drinking water.

The MCLs are:

PFOA: 14 parts per trillion (ppt)
PFOS: 18 ppt

Although the standards apply to all public water systems, monitoring requirements apply to community water systems; nontransient noncommunity water systems; and bottled, vended, retail, and bulk systems. 

Pennsylvania must adopt MCLs at least as stringent as the federal MCLs.

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

Related information

Safe Drinking Water Act ezExplanation 
Drinking water (SDWA) ezExplanation 
Pennsylvania DEP PFAS MCL Rule

Citations

Pennsylvania Code Section 109.202
Pennsylvania Code Section 109.201
Federal regulation 40 CFR Part 141 
Federal regulation 40 CFR Part 142 
Federal regulation 40 CFR Part 143

['Water Programs']

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

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