The Environmental Protection Agency (EPA) has begun the process of developing the sixth Contaminant Candidate List (CCL6). In the February 17, 2023 Federal Register, EPA published a request for nomination to the CCL6.
“EPA requests that nominations include information showing the nominated contaminant is known or anticipated to occur in public
water systems and indicating the nominated contaminant may have an adverse health effect on humans.”
Nominations are due by April 18, 2023. The Federal Register notice includes information on how to submit nominations and supporting information.
“The CCL is a list of contaminants that are currently not subject to any proposed or promulgated national primary drinking water regulations, that are known or anticipated to occur in public water systems, and which may require regulation under the Safe Drinking Water Act (SDWA). EPA uses this list of unregulated contaminants to prioritize research and data collection efforts to help the agency determine whether to regulate a specific contaminant. The SDWA requires that EPA publish the CCL every five years….The SDWA also requires EPA to make regulatory determinations of whether or not to regulate no fewer than five contaminants from the CCL every five years.”
The fifth Contaminant Candidate list (CCL5) was published on November 14, 2022.