Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List

• On this page  
     
  • The Second CCL Regulatory Determinations Schedule
     
  • July 2008 Final Regulatory Determinations for Priority Contaminants on the second Contaminant Candidate List      
           
    • Federal Register Notice
           
    • Support Documents for Regulatory Determinations Notice
           
    • May 1, 2007 Preliminary Determinations Federal Register Notice
         
       
     
  • Final Regulatory determination and development history for perchlorate
       
   

The Safe Drinking Water Act (SDWA), as amended in 1996, directs the Environmental Protection Agency (EPA) to publish a list of contaminants (referred to as the Contaminant Candidate List, or CCL) to assist in priority-setting efforts. SDWA also directs the Agency to select five or more contaminants from the current CCL and determine whether to regulate these contaminants with a National Primary Drinking Water Regulation (NPDWR).

To regulate a contaminant SDWA requires that EPA determine whether:

1. The contaminant may have an adverse effect on the health of persons;
2. The contaminant is known to occur or there is a substantial likelihood the contaminant will occur in public water systems with a frequency and at levels of public health concern; and
3. In the sole judgment of the Administrator, regulation of the contaminant presents a meaningful opportunity for health risk reductions for persons served by public water systems.

EPA published the second CCL (CCL 2) in 2005. In May 2007, the Agency published a Federal Register (FR) notice announcing and requesting comment on its preliminary determinations for 11 of the 51 CCL 2 contaminants. As part of this May 2007 FR notice, EPA also described the available health effects and occurrence information for perchlorate and stated that additional information was needed to more fully characterize perchlorate exposure and determine whether there was a meaningful opportunity for health risk reduction from a perchlorate regulation. In July 2008, and after careful consideration of public comments, EPA published its final determination that no regulatory action is appropriate or necessary for the following eleven contaminants: boron: the dacthal mono- and di-acid degradates: 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE): 1,3-dichloropropene (Telone): 2,4-dinitrotoluene: 2,6-dinitrotoluene: s-ethyl propylthiocarbamate (EPTC): fonofos: terbacil: or 1,1,2,2-tetrachloroethane.

• More information about perchlorate and the final regulatory determination including the development history can be found here.
  

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The Second CCL Regulatory Determinations Schedule

Date	Regulatory Determination
September 2004	Stakeholder meeting to provide a program update and to seek input from stakeholders on contaminants being considered for regulatory determinations.
May 2007	Announcement of Preliminary Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List
May - June 2007	60 day public comment period
July 2008	Announcement of Final Regulatory Determinations for Priority Contaminants on the Second Drinking Water Contaminant Candidate List

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July 2008 Final Regulatory Determinations for Priority Contaminants on the second Contaminant Candidate List

Federal Register Notices

• July 30, 2008 Final Determinations Federal Register Notice
  Drinking Water: Regulatory Determinations Regarding Contaminants on the Second Drinking Water Contaminant Candidate List | Print Version (PDF) (11 pp, 223K)
  • Fact Sheet: Announcement of Final Regulatory Determinations for Priority Contaminants on the Drinking Water Contaminant Candidate List PDF (4 pp, 74K)
    EPA 815-F-08-005
• May 1, 2007 Preliminary Determinations Federal Register Notice
  Drinking Water: Regulatory Determinations Regarding Contaminants on the Second Drinking Water Contaminant Candidate List--Preliminary Determinations | Print Version (PDF) (2 pp, K)

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Support Documents for Regulatory Determinations Notice

• Regulatory Determinations Support Document for Selected Contaminants from the Second Drinking Water Contaminant Candidate List (CCL 2) PDF (497 pp, 9M)
  EPA 815-R-08-012

• The Analysis of Occurrence Data from the First Unregulated Contaminant Monitoring Regulation (UCMR 1) in Support of Regulatory Determinations for the Second Drinking Water Contaminant Candidate List PDF (278 pp, 24M)
  EPA 815-R-08-013
• The Analysis of Occurrence Data from the Unregulated Contaminant Monitoring (UCM) Program and National Inorganics and Radionuclides Survey (NIRS) in Support of Regulatory Determinations for the Second Drinking Water Contaminant Candidate List PDF (120 pp, 6M)
  EPA 815-R-08-014

Boron

• Chapter 3: Boron PDF (29 pp, 571K)
• Health Effects Support Document for Boron PDF (136 pp, 4M)
  EPA 822-R-08-002
• Health Advisory for Boron PDF (65 pp, 330K)
  EPA 822-R-08-013
  • Summary From the Health advisory for Boron PDF (3 pp, 30K)
    EPA 822-S-08-003

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Dacthal mono- and di-acid degradates

• Chapter 4: DCPA Mono- and Di-Acid Degradates PDF (39 pp, 1M)
• Health Effects Support Document for Dacthal Degradates: Tetrachloroterephthalic Acid (TPA) and Monomethyl Tetrachloroterephthalic Acid (MTP) PDF (89 pp, 3M)
  EPA 822-R-08-0005
• Health Advisory for Dacthal Degradates: Tetrachloroterephthalic Acid (TBA) and Monomethyl Tetrachloroterephthalic Acid (MTP) PDF (4 7pp, 221K)
  EPA 822-R-08-011
  • Summary From the Health Advisory for Dacthal Degradates: Tetrachloroterephthalic Acid (TBA) and Monomethyl Tetrachloroterephthalic Acid (MTP) PDF (3 pp, 30K)
    EPA 822-S-08-002

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DDE (1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene)

• Chapter 5: DDE PDF (31pp, 707K)
• Health Effects Support Document for 1,1-Dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE) PDF (128 pp, 1.21M)
  EPA 822-R-08-003

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Telone (1,3-dichloropropene)

• Chapter 6: 1,3-Dichloropropene PDF (41 pp, 1M)
• Health Effects Support Document for 1,3-Dichloropropene PDF (142 pp, 6M)
  EPA 822-R-08-008

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2,4-dinitrotoluene, 2,6-dinitrotoluene

• Chapter 7: 2,4- and 2,6-Dinitrotoluene PDF (41 pp, 735K)
• Health Advisory for 2,4 - and 2,6-Dinitrotoluene PDF (97 pp, 566K)
  EPA 822-R-08-010

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EPTC (s-ethyl propylthiocarbamate)

• Chapter 8: EPTC PDF (27 pp, 572K)
• Health Effects Support Document for S-Ethyl dipropylthiocarbamate (EPTC) PDF (56 pp, 1M)
  EPA 822-R-08-006

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Fonofos

• Chapter 9: Fonofos PDF (26 pp, 484K)
• Health Effects Support Document for Fonofos PDF (58 pp, 1M)
  EPA 822-R-08-009

Terbacil

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• Chapter 10: Terbacil PDF (28 pp, 550K)
• Health Effects Support Document for Terbacil PDF (62 pp, 2M)
  EPA 822-R-08-004

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1,1,2,2-tetrachloroethane

• Chapter 11: 1,1,2,2-Tetrachloroethane PDF (38 pp, 973K)
• Health Effects Support Document for 1,1,2,2-Tetrachloroethane PDF (144 pp, 3M)
  EPA 822-R-08-007
• Health Advisory for 1,1,2,2-Tetrachloroethane PDF (50 pp, 270K)
  EPA 822-R-08-012
  • Summary From the Health Advisory for 1,1,2,2-Tetrachloroethane PDF (50 pp, 24K)
    EPA 822-S-08-001

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