['Water Programs']

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

11/21/2025

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Drinking Water MCLs for PFAS Chemicals — Colorado

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Drinking Water MCLs for PFAS Chemicals — Colorado

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

Colorado follows federal Maximum Contaminant Levels (MCLs) with a compliance date of April 1, 2027.  

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

Related information

Safe Drinking Water Act ezExplanation 
Drinking water (SDWA) ezExplanation 
CDPHE PFAS Rule
CDPHE Water Quality Commission Policy 20-1 Policy for Interpreting Narrative Water Quality Standards for PFAS

Citations

Colorado Primary Drinking Water Regulations 5 CCR 1002-11
Federal regulation 40 CFR Part 141
Federal regulation 40 CFR Part 142
Federal regulation 40 CFR Part 143

['Water Programs']

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

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