Hexavalent Chromium MCL (SWRCB-DDW-21-003)

Certified State Water Board Resolution 2024-0015, Adopting the Proposed Hexavalent Chromium Maximum Contaminant Level Regulations

Text of Proposed Regulations (as adopted)

Initial 45-Day Comment Period

Notice of Proposed Rulemaking, Public Hearing, and 45-day Notice Period to Consider Proposed Hexavalent Chromium MCL Regulation (English | Español)

• Revised Notice of Proposed Rulemaking | Español
• Second Revised Notice of Proposed Rulemaking
• Third Revised Notice of Proposed Rulemaking

6/16/23

7/21/23
8/01/23
8/04/23

Initial Statement of Reasons (ISOR) - ISOR Errata

• ISOR Attachment 1: Cost Tables
• ISOR Attachment 2: Standardized Regulatory Impact Assessment (SRIA) and Cost Estimating Methodology (updated)
• ISOR Attachment 3: Other Chemicals Above the PHG
• ISOR Attachment 4: DLR Surveys Summary
• ISOR Attachment 5: Cost Estimates for Individual Sources

Text of Originally Proposed Regulations

• U.S. EPA Method 218.6
• U.S. EPA Method 218.7

Office of Administrative Law (OAL) Notices:

• Notice Register Index, OAL Notice No. Z2023-0606-03
• California Regulatory Notice Register 2023, Volume No. 24-Z, pp. 783-804

Public Hearing held on August 2, 2023

Notice Email for Board Meeting

• Agenda Item, Item 5 (English | Español)
• Video Recording of Public Hearing (English | Español)
• Staff PowerPoint Presentation (English | Español)
• Transcript

First 15-Day Comment Period

Notice of Public Availability of Changes to Proposed Regulations (English | Spanish)

• Revised Text of Proposed Regulations
• Addendum to Initial Statement of Reasons (ISOR)

Second 15-Day Comment Period

Notice of Public Availability of Additional Documents Relied Upon (English | Español)

• OEHHA. (2023). Public Review Draft of a Proposed Health-Protective Concentration for the Noncancer Effects of Hexavalent Chromium in Drinking Water. California Environmental Protection Agency, Office of Environmental Health Hazard Assessment.
• SWRCB.(2024). Consolidation and Alternatives Analysis. State Water Resources Control Board.
  • Attachment 1
• Revised Notice of Public Availability of Additional Documents Relied Upon (English | Español) – to extend the comment period and to add Attachment 1 to SWRCB (2024)

1/31/24

2/14/24

Notice Email for Board Meeting

• Agenda, Item 6 (English | Spanish)
• Draft Resolution
• Attachment 1: CEQA Findings and Statement of Overriding Considerations
• Attachment 2: Proposed Regulation Text
• Draft Responsive Summary for Comments
• Video Recording
• Staff PowerPoint Presentation (English | Spanish)
• Transcript

• Attachment 1

External Scientific Peer Review

• Request for Peer Review
• Peer Reviewer Responses
• Reviewer 1
• Reviewer 2
• Reviewer 3
• State Water Board Responses to Reviewers

California Environmental Quality Act (CEQA)

• Notice of Preparation of a Draft Program Environmental Impact Report
• Draft Environmental Impact Report
• Appendix A
• Appendix B
• Appendix C
• Appendix D
• Appendix E
• Notice of Availability of Draft Environmental Impact Report
• Notice of Completion of Draft Environmental Impact Report
• Final Environmental Impact Report
  • Revised Appendix A
  • Revised Appendix C
  • New Appendix F - Comment Letters and Public Meeting Transcript
• Notice of Determination

An Excel List of Materials and Documents Relied Upon is available. However, not all documents are available online. To request a document, email DDWRegUnit@waterboards.ca.gov.

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• OEHHA. (2023). Public Review Draft of a Proposed Health-Protective Concentration for the Noncancer Effects of Hexavalent Chromium in Drinking Water. California Environmental Protection Agency, Office of Environmental Health Hazard Assessment.
• Parks, J. L.; Mantha, A.; Edwards, M.; Kommineni, S.; Shim,Y.; Porter, K.; & Imamura, G. (2017). Bench-Scale Evaluation of Alternative Cr(VI) Removal Options for Small Systems (Project #4561). Water Research Foundation.
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• Attachment 1
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