Per- and Polyfluoroalkyl Substances (PFAS) NPDWR Implementation
Below are resources to help states and water utilities implement the PFAS National Primary Drinking Water Regulation (NPDWR).
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Implementation Products
Products to aid with implementation of the PFAS NPDWR are provided below.
- Control of PFAS Overview: A Quick Reference Guide (pdf)
- PFAS Initial Monitoring: A Quick Reference Guide (pdf)
- PFAS Hazard Index: A Quick Reference Guide (pdf)
- PFAS NPDWR Significant Figures and Rounding Requirements (pdf)
Memorandums
Memorandums: PFAS National Primary Drinking Water Regulation Monitoring and Reporting
EPA issued two memorandums that provide drinking water primacy agencies, laboratories, and water systems with clarifying information related to the monitoring and reporting requirements under the PFAS NPDWR. The two memorandums are similar and include information on the initial monitoring requirements and how previously collected data, such as data from the fifth Unregulated Contaminant Monitoring Rule (UCMR 5), can be used to satisfy some or all of these requirements and inform PFAS compliance monitoring frequency determinations. Additionally, the memorandums provide information related to laboratory analytical requirements and recommendations for reporting of PFAS drinking water sample results.
- Memorandum for Primacy Agencies: PFAS National Primary Drinking Water Regulation Monitoring and Reporting (pdf)
- Memorandum for Laboratory Community and Water Systems: PFAS National Primary Drinking Water Regulation Monitoring and Reporting (pdf)
PFAS Primacy
Memorandum: Primacy Requirements for Control of Per- and Polyfluoroalkyl Substances National Primary Drinking Water Regulation
This memorandum provides general guidance to primacy agencies under the Safe Drinking Water Act (SDWA) concerning the requirements for the NPDWR. This memorandum highlights key implementation deadlines and the requirements for primacy.
PFAS Rule Crosswalk
The rule crosswalk is a side-by-side comparison of the federal requirements and the corresponding State authorities for the development of the primacy application.
Primacy Package Training
EPA held an informational training webinar on November 18, 2024 to provide guidance to primacy agency and EPA regional staff to support the submission of primacy packages.
Further Information
Information on the final PFAS NPDWR and supporting materials provided at the time of rollout of the final rule can be found here.