The Wisconsin Department of Natural Resources (WDNR) administrative rule process for two common forms of perfluoroalkyl and polyfluoroalkyl substances (PFAS) has ended, resulting in new standards for drinking water and surface water. This affects the PFOA and PFOS groups of PFAS.
The new drinking water Maximum Contaminant Level (MCL) for PFOA and PFOS is 70 parts per trillion (ppt). Previously, the 70 ppt level was an advisory limit.
New sampling requirements by the WDNR are now in effect as well. Effective August 1, 2022, communities are required to conduct the initial sampling for PFOA and PFOS as follows:
Systems serving more than 50,000 people – Sample beginning November 2022
Systems serving between 10,000-49,999 people – Sample beginning February 2023
Systems serving less than 10,000 people – Sample beginning May 2023
The WDNR is implementing the Wisconsin Department of Health Services (DHS) recommended standards and/or hazard index to determine the course of action needed. If the PFAS sampling results are in exceedance of the DHS requirements, the municipality is required to report a Tier 2 Public Notice per NR 809.950.
Communities that test above a combined level of the 70ppt MCL for PFOS and PFOA will be required to establish a plan for remediation. The WDNR will work collaboratively with municipalities and industrial point sources to comply with the new MCL requirements.
The WDNR lists granular activated carbon (GAC), ion exchange, nanofiltration, and reverse osmosis for PFOS and PFOA as the best available treatments.
We Can Help!
Our team of water experts can help your community navigate the new PFAS rules and establish treatment methods. If you have questions or concerns about your PFAS levels, please contact us today.
Read More Articles on PFAS:
Wastewater Treatment Facility PFAS Update
ABOUT THE AUTHOR
Christopher L. Epstein, P.E.
PROJECT Engineer
Chris has extensive experience in the planning, design, and construction of water supply and wastewater management facilities. He also has experience with the start-up of water and wastewater treatment processes.
