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CCL 1 List and Regulatory Determinations
On March 2, 1998, EPA announced the first Drinking Water Contaminant Candidate List (CCL 1). On July 18, 2003, the Agency announced its formal decision on whether to develop regulations for contaminants on the first CCL.
- On this page
Other resources
- Final CCL 1 Federal Register Notice - posted on March 2, 1998.
- Related Activities & Dates - This page includes key meetings, Federal Register Notices and dates related to the CCL.
- Regulatory Determinations for Priority Contaminants on the First Drinking Water Contaminant
CCL 1 List
Microbial Contaminant Candidates
| Microbial Contaminants |
|---|
| Acanthamoeba |
| Adenoviruses |
| Aeromonas hydrophila |
| Caliciviruses |
| Coxsackieviruses |
| Cyanobacteria (blue-green algae), other freshwater algae, and their toxins |
| Echoviruses |
| Helicobacter pylori |
| Microsporidia (Enterocytozoon & Septata) |
| Mycobacterium avium intracellulare (MAC) |
Chemical Contaminant Candidates
| Chemical Contaminant | Chemical Abstract Service Registration Number (CASRN)1 |
|---|---|
| 1,1,2,2-tetrachloroethane | 79-34-5 |
| 1,2,4-trimethylbenzene | 95-63-6 |
| 1,1-dichloroethane | 75-34-3 |
| 1,1-dichloropropene | 563-58-6 |
| 1,2-diphenylhydrazine | 122-66-7 |
| 1,3-dichloropropane | 142-28-9 |
| 1,3-dichloropropene | 542-75-6 |
| 2,4,6-trichlorophenol | 88-06-2 |
| 2,2-dichloropropane | 594-20-7 |
| 2,4-dichlorophenol | 120-83-2 |
| 2,4-dinitrophenol | 51-28-5 |
| 2,4-dinitrotoluene | 121-14-2 |
| 2,6-dinitrotoluene | 606-20-2 |
| 2-methyl-Phenol (o-cresol) | 95-48-7 |
| Acetochlor | 34256-82-1 |
| Alachlor ESA & other acetanilide pesticide degradation products | N/A |
| Aldrin | 309-00-2 |
| Aluminum | 7429-90-5 |
| Boron | 7440-42-8 |
| Bromobenzene | 108-86-1 |
| DCPA mono-acid degradate | 887-54-7 |
| DCPA di-acid degradate | 2136-79-0 |
| DDE | 72-55-9 |
| Diazinon | 333-41-5 |
| Dieldrin | 60-57-1 |
| Disulfoton | 298-04-4 |
| Diuron | 330-54-1 |
| EPTC (s-ethyl-dipropylthiocarbamate) | 759-94-4 |
| Fonofos | 944-22-9 |
| Hexachlorobutadiene | 87-68-3 |
| p-Isopropyltoluene (p-cymene) | 99-87-6 |
| Linuron | 330-55-2 |
| Manganese | 7439-96-5 |
| Methyl bromide | 74-83-9 |
| Methyl-t-butyl ether (MTBE) | 1634-04-4 |
| Metolachlor | 51218-45-2 |
| Metribuzin | 21087-64-9 |
| Molinate | 2212-67-1 |
| Naphthalene | 91-20-3 |
| Nitrobenzene | 98-95-3 |
| Organotins | N/A |
| Perchlorate | 14797-73-0 |
| Prometon | 1610-18-0 |
| RDX | 121-82-4 |
| Sodium | 7440-23-5 |
| Sulfate | 14808-79-8 |
| Terbacil | 5902-51-2 |
| Terbufos | 13071-79-9 |
| Triazines & degradation products of triazines | including, but not limited to Cyanazine 21725-46-2 and atrazine-desethyl 6190-65-4 |
| Vanadium | 7440-62-2 |
Notes
1Chemical Abstract Service Registration Number (CASRN#) - Chemical abstract service registry numbers are used in reference works, databases, and regulatory compliance documents by many organizations around the world to identify substances with a standardized name.