What do the Michigan criteria and federal advisory levels of 70 ppt for PFOA and PFOS represent?

  • The Michigan criteria and federal advisories relate only to drinking water and only to PFOA and PFOS. (http://www.michigan.gov/deq/0,4561,7-135–457220–,00.html) (https://www.epa.gov/ground-water-and-drinking-water/drinking-water-health-advisories-pfoa-and-pfos)
  • Drinking water at a level above the Michigan criteria and federal advisories does not necessarily mean that adverse health effects are expected.
  • Heath-protective screening levels, such as the Michigan criteria and federal advisories, do not represent bright lines between safe doses and those where health effects would be expected. Rather, such conservative levels are set by regulatory agencies using assumptions (e.g. a full lifetime of exposure) and methods (e.g. safety factors) designed to result in health-protective screening levels that are precautionary in nature.
  • The “safety buffer” built into the federal advisory levels assumes exposure for an entire lifetime, and that a pregnant or nursing woman could drink over 4 liters of water per day at 70 ppt PFOA/PFOS with no effect on developing babies and infants.
  • Neither Michigan nor the EPA has issued any health advisories for using water containing PFOA/PFOS for bathing, cleaning, washing dishes and laundry.