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National Contaminant Occurrence Database (NCOD)

Published by U.S. EPA Office of Water (OW) - Office of Ground Water and Drinking Water (OGWDW) | U.S. Environmental Protection Agency | Metadata Last Checked: July 31, 2025 | Last Modified: 2013-11-05
NCOD is a repository of drinking water quality data to be made available to EPA decision makers and the public.

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