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DPH Sets PFAS Action Levels

The Connecticut Department of Public Health (DPH) updated its drinking water Action Levels for Per and Polyfluoroalkyl Substances (PFAS) which are:


• 10 parts-per-trillion (PPT; ng/L) for perfluorooctane sulfonic acid (PFOS)

• 12 PPT; ng/L for perfluorononanoic acid (PFNA)

• 16 PPT; ng/L for perfluorooctanoic acid (PFOA)

• 49 PPT; ng/L) for perfluorohexane sulfonic acid (PFHxS) 


In light of these updated Connecticut Drinking Water Action Levels, DPH has renewed its recommendation to all public water systems to test the water delivered to their customers for PFAS and to report the results. It is DPH’s expectation that public water systems with PFAS in the water distributed to customers will inform their customers and evaluate actions the water systems can take to reduce exposures, such as taking a source of supply off-line, if possible, blend with other sources or turn to an alternative source of drinking water while the system works with DPH on possible treatment or source replacement. 


Download the Press Release


Also today, the US Environmental Protection Agency (EPA) announced new drinking water lifetime health advisories for four compounds in the PFAS family. EPA health advisories provide information on contaminants that can cause human health effects and are known or anticipated to occur in drinking water.


Similar to the DPH Drinking Water Levels, EPA's health advisories are non-enforceable and non-regulatory and provide technical information to states agencies and other public health officials. Two of the EPA Health Advisories announced today are interim Health Advisories, meaning that they are draft values and are subject to continued peer review of the underlying science and may change before they are finalized. 


In response, DPHDWS issued Circular Letter 22-30 to provide public water suppliers with updated information regarding PFAS and drinking water.


Download DWS Circular Letter 22-30

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