Health Risk Limit Rules for Groundwater
Rule Information (2007)
2007 PFOA/PFOS and Maximum Contaminant Level (MCL)-based rules
Minnesota Legislation in 2007 (Minnesota Session Laws 2007, Chapter 37, Section 1) directed the Minnesota Department of Health to adopt Health Risk Limits (HRL) rules for the chemicals perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). The legislation authorized the commissioner to use the good cause exemption process for rule making. HRL values of 0.3 ug/L for PFOS and 0.5 ug/L for PFOS were added to the rules in August 2007.
In separate legislation (Minnesota Session Laws 2007 Chapter 147, Article 17, Section 2., “Water level standards”), the legislature established new HRLs for chemicals that had at that time both a federal Maximum Contaminant Level (MCL) and an MDH HRL. The new HRL would be the MCL if that value was lower than the HRL. MDH published a list of eleven chemicals and the corresponding new HRL value in the state register in August 2007 and posted the new values on the MDH website. This legislative directive did not involve the rule making steps followed in other years.