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State Info

Drinking Water MCLs for PFAS Chemicals — Rhode Island

RegSenseState InfoWater AnalysisToxic Water PollutantsWater ProgramsWater ReportingMaximum Contaminant LevelsBest ResultsEnvironmentalRhode IslandWater MonitoringWater ProgramsEnglishFocus AreaCWA Compliance

Rhode Island follows the federal Maximum Contaminant Levels (MCLs). 

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

As of September 18, 2024, the state established an interim Maximum Contaminant Level (MCL) of 20 parts per trillion (ppt) for six PFAS contaminants, including PFOS, PFOA, PFDA, PFNA, PFHxS, and PFHpA, individually or combined.  Public water systems with results greater than 20 ppt are required to issue public advisories to their customers. Do not drink orders must be issued for public water systems with PFAS results that are greater than 70 ppt. 

A guidance document revised in January 2025 states that Rhode Island will be required to adopt EPA’s MCLs by 2026.

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Citations

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