The United States Environmental Protection Agency (US EPA) has finalized the long-anticipated National Primary Drinking Water Regulation to establish enforceable Maximum Contaminant Levels (MCLs) for PFAS as follows:
| Compound | Final MCLG | Final MCL (enforceable levels) |
| PFOA | Zero | 4.0 parts per trillion (ppt) (also expressed as ng/L) |
| PFOS | Zero | 4.0 ppt |
| PFHxS | 10 ppt | 10 ppt |
| PFNA | 10 ppt | 10 ppt |
| HFPO-DA (commonly known as GenX Chemicals) | 10 ppt | 10 ppt |
| Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS | 1 (unitless)
Hazard Index |
1 (unitless)
Hazard Index |
The regulation will require public water systems to monitor for these PFAS, giving them three years to complete the initial monitoring followed by ongoing compliance monitoring. Beginning in 2027, water systems will also be required to notify the public with information on the levels of PFAS in their drinking water. If monitoring shows a public water system exceeds the new limits, it will have until 2029 to implement solutions to reduce these PFAS in its system.
Wright-Pierce has been at the forefront of PFAS treatment and technologies and has the capabilities and expertise necessary to assist municipalities and utilities as they navigate these new regulations. Contact us with questions or to begin the process of helping your community remove PFAS from its drinking water.
For more details regarding the new regulations and guidance on the changes, visit the US EPA’s website: https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas
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According to a recent Bloomberg Law report, on March 29, 2024, a federal court in South Carolina approved 3M Corporation’s offer of at least $10 billion to settle claims made by public water systems across the United States related to PFAS. To find out more about your community’s eligibility and application requirements contact us – our funding specialists are available to advise and guide you through the process.