The New Hampshire Department of Environmental Services (NHDES) filed last week a final rulemaking proposal to establish Maximum Contaminant Levels (MCL) and Ambient Groundwater Quality Standards for four PFAS:
- PFOA at 12 parts per trillion (ppt)
- PFOS at 15 ppt
- PFHxS at 18 ppt
- PFNA at 11 ppt
NHDES evaluated the extent of PFAS contamination in the state, the ability to detect PFAS in public water systems, the ability to remove PFAS from drinking water, and costs and benefits to affected parties from the development of the standards. The rules underwent public comment and, if approved, will become effective October 1.