NDWAC M/DBP Working Group Charge

In November 2021 EPA published in the Federal Register a request for nominations to a new National Drinking Water Advisory Council (NDWAC) Microbial/Disinfection Byproduct (M/DBP) Working Group (Fed Reg_NDWAC MDBP Working Group_2021-11-12).  Nominations are due by December 13, 2021.

Updated information – EPA recently posted the charge (mdbp-rule-revisions-charge-to-the-ndwac) to the NDWAC and the M/DBP Working Group.  EPA anticipates the M/DBP Working Group will meet starting in the Spring 2022 and go through mid-2023.

Additional information below.


Under the SDWA as amended in 1996, EPA is required to conduct a review of drinking water regulations every six years, and if appropriate, revise specific regulations.  In January 2017, EPA published for public review the completion of its third review of existing drinking water regulations. EPA determined that eight regulations are candidates for regulatory revision. The eight regulations are chlorite, Cryptosporidium, Giardia lamblia, haloacetic acids (HAA5), heterotrophic bacteria, Legionella, TTHM, and viruses.  These constituents are currently regulated under the Long-term 2 Enhanced Surface Water Treatment Rule and the Stage 2 Disinfection Byproducts Rule and are referred to as M/DBP regulations.