Draft CCL 6 Technical Support Documents

The EPA developed three technical support documents to describe the processes and data used to identify chemical and microbial contaminants for the CCL 6.

Read the EPA's technical support documents for the draft CCL 6 below:

• Technical Support Document for the Draft Sixth Contaminant Candidate List (CCL 6) - Chemical Contaminants (pdf) (4.29 MB, February 2026, EPA 815-R-26-004)
• Technical Support Document for the Draft Sixth Contaminant Candidate List (CCL 6) - Contaminant Information Sheets (pdf) (16.46 MB, February 2026, EPA 815-R-26-005)
• Technical Support Document for the Draft Sixth Contaminant Candidate List (CCL 6) - Microbial Contaminants (pdf) (4.5 MB, February 2026, EPA 815-R-26-006)