['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 — Delaware

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Drinking Water MCLs for PFAS Chemicals — Delaware

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

Delaware follows the federal Maximum Contaminant Levels (MCLs).

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

The state has rulemaking in progress to add the federal MCLs to Chapter 30R of the Delaware Code. 

Related information

Safe Drinking Water Act ezExplanation
Drinking water (SDWA) ezExplanation
DNREC PFAS and Drinking Water

Citations

Delaware Code Section 8093
Delaware Senate Bill 72 (under development)
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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