During a public stakeholder meeting on June 16, 2011, U.S. EPA revealed a preliminary "short list" of the 32 chemicals it is  considering for possible future regulation under the federal Safe Drinking Water Act.  The short list was derived from ongoing review of a larger set of 116 substances that U.S. EPA had identified for possible future regulation in its Contaminant Candidate List 3 ("CCL3"), published in the Federal Register on October 8, 2009.  U.S. EPA indicated that it intends to initiate regulatory determinations by mid-2012, with a final decision by the summer of 2013 as to whether U.S. EPA will regulate 5 or more of the substances as drinking water contaminants.  The substances from the original CCL3 that have moved through the review process onto USEPA's current short list (some of which may, if ultimately regualted, be regulated as groups) are:

  • 5 nitrosamines
  • chlorate
  • molybdenum
  • strontium
  • vanadium
  • 1,1,1,2-tetrachloroethane
  • 1,2,3-trichloropropane (TCP)
  • 1,3-dinitrobenzene
  • 1,4-dioxane
  • methyl tertiary butyl ether (MTBE)
  • nitrobenzene
  • perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS)
  • RDX
  • dimethoate
  • disulfoton
  • diuron
  • molinate
  • terbufos and terbufos sulfone
  • acetochlor and ESA and OA degradates
  • alochlor ESA and OA degradates
  • metachlor and ESA and OA degradates