What EPA Does With the CCL
![Lab Scientist Scientist performing chemical analysis in a laboratory](/sites/production/files/styles/large/public/2014-05/watersupply_025.jpg)
Developing the Contaminant Candidate List (CCL) is the first step in evaluating drinking water contaminants. The Agency continues to further evaluate contaminants on the list by:
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Continuing to collect data and encourage further research on listed contaminants to better understand potential health effects and at what levels they occur in drinking water.
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Periodically making Regulatory Determinations for CCL contaminants with sufficient health and occurrence data.