The Safe Drinking Water Act (SDWA), as amended in 1996, requires the Administrator of the Environmental Protection Agency to establish a list of contaminants to aid the agency in regulatory priority setting for the drinking water program. In addition, SDWA requires EPA to make regulatory determinations for no fewer than five contaminants by August 2001. The criteria used to determine whether or not to regulate a chemical on the CCL are as follows: The contaminant may have an adverse effect on the health of persons; the contaminant is known to occur or there is a substantial likelihood that the contaminant will occur in public water systems with a frequency and at levels of public health concern; and in the sole judgment of the administrator, regulation of such contaminant presents a meaningful opportunity for health risk reduction for persons served by public water systems. The Agency's findings for all three statutory criteria are used in order to make a determination to regulate a contaminant. The Agency may determine that there is no need for a regulation when a contaminant fails to meet one of the statutory criteria. A decision not to regulate is considered a final agency action and is subject to judicial review. This document provides the health effects basis for the preliminary regulatory determination for aldrin and dieldrin.

"EPA 822-R-02-027." "April 2002." Cover title. Includes bibliographical references (pages 10-1-10-30).