Timeline of Key Developments

PFOS and PFOA EPA Health Advisories

  • JANUARY 8, 2009EPA Publishes Provisional Health Advisory
    • Short-term adverse health effects
    • PFOS: 200 ppt  • PFOA:  400 ppt
  • MAY 19, 2016EPA Issues a Lifetime Drinking Water Health Advisory
    • Long-term adverse health effects
    • PFOS + PFOA: 70 ppt

PFOA/PFOS Detection

  • JANUARY 2013EPA Monitoring Begins With Higher Limit
  • DECEMBER 2015EPA Monitoring Concludes
  • FEBRUARY 2016Bristol Monitoring Follow-Up
  • APRIL 2016Horsham Interconnect Monitoring
  • MAY 2016EPA Changes Health Advisory
  • JULY 2016Monitoring in Bucks and Montgomery Counties
timeline