MEMORANDUM

SUBJECT: 	“Drinking Water Contaminant Candidate List 3 - Draft” -
Executive Order 12866 Docking Requirements Compliance SAN 4745; RIN
2040-AD99

FROM: 	Thomas R. Carpenter, CCL 3 Manager

		Office of Ground Water and Drinking Water

TO: 		Docket OW-2007-1189

OVERVIEW

	The Safe Drinking Water Act (SDWA) requires EPA to publish a list of
currently unregulated contaminants that are known or anticipated to
occur in public water systems and which may require regulation.  EPA
must publish the Contaminant Candidate List (CCL) every five years.  EPA
last published a CCL (CCL 2) on February 24, 2005.  The purpose of this
action is to:

present EPA’s draft list of contaminants listed on the CCL 3; 

describe the process and basis for selecting the contaminants for the
CCL 3; and 

request comments upon the Draft CCL 3, the process, and the data used
to develop the Draft CCL 3.

	This draft CCL 3 includes 93 chemicals or chemical groups and 11
microbiological contaminants.  The list includes chemicals used in
commerce, pesticides, biological toxins, disinfection by-products, and
waterborne pathogens.  The Agency evaluated approximately 7,500
chemicals and microbes and selected 104 candidates for the Draft CCL3
that have the potential to present health risks through drinking water
exposure.  

OMB Transaction

	EPA initiated Office of Management and Budget review of the Federal
Register notice:  “Drinking Water Contaminant Candidate List 3” on
September 20, 2007.  OMB requested only minor editorial and clarifying
changes.  Therefore EPA did not make substantive changes.  OMB concluded
their review on December 19, 2007 with a designation of “consistent
with changes.”  

	

