The Michigan Department of Environment, Great Lakes, and Energy (EGLE) announced October 14 its decision to move forward with formal rulemaking on limits for certain PFAS compounds in drinking water.
The draft rules establish Maximum Contaminant Levels (MCLs) for 7 PFAS at levels of 6 parts per trillion (ppt) for PFNA, 8 ppt for PFOA, 16 ppt for PFOS, 51 ppt for PFHxS, 370 ppt for GenX, 420 ppt for PFBS, and 400,000 ppt for PFHxA. Roughly 2,700 public water system operators around the state would be covered under the new rule.
Michigan Governor Gretchen Whitmer earlier this year directed EGLE and the Michigan PFAS Action Response Team (MPART) to develop these standards. The MPART Science Advisory Workgroup recommended health-based values, which Whitmer then reviewed.
The draft regulations are subject to a public comment period beginning in late 2019. A final rule could be adopted by April 2020.
See Michigan’s press release for full details and information.