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

Information and Documentation Pertaining to This Regulatory Proposal

Status of Proposal

This rulemaking is in progress.

• A hearing was held on August 2, 2023
• A video recording of the hearing is available
• Written comments are due August 18, 2023

Proposed MCL: 10 ppb (0.010 mg/L)

Proposed DLR: 0.1 ppb (0.0001 mg/L)

This MCL includes a compliance schedule based on water system size and requirements to submit compliance plans and operations plans under certain conditions. See the rulemaking documentation below for details.

Inquiries regarding the contents of these regulations may be directed to Bethany Robinson (Bethany.Robinson@waterboards.ca.gov) and Melissa Hall (Melissa.Hall@waterboards.ca.gov).

Rulemaking Documentation

45-Day Comment Period Documentation

• Notice of Proposed Rulemaking
  • English | Spanish
  • Revised Notice of Proposed Rulemaking | Spanish
  • Second Revised Notice of Proposed Rulemaking
  • Third Revised Notice of Proposed Rulemaking
• Text of Proposed Regulations
  • U.S. EPA Method 218.6
  • U.S. EPA Method 218.7
• Initial Statement of Reasons (ISOR) - ISOR Errata
  • ISOR Attachment 1: Cost Tables
  • ISOR Attachment 2: Standardized Regulatory Impact Assessment 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

Final Documentation

• TBD

Complete Rulemaking Documentation Files

CEQA Documentation

• 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

Peer Review Documents

• Peer Review Request
• Peer Review
  • Reviewer 1
  • Reviewer 2
  • Reviewer 3
• Peer Review Response

History of Rulemaking Proceedings

• Standardized Regulatory Impact Assessment (SRIA) Submitted to Department of Finance: 13 December 2022
  • SRIA
  • DF-131
• Notice of Proposed Rulemaking Published: 16 June 2023
• Close of the 45-Day Public Comment Period: 04 August 2023
• Date of Scheduled Public Hearings: 02 August 2023
• Date Filed with Office of Administrative Law: TBD
• Approved by Office of Administrative Law: TBD
• Filed with the Secretary of State: TBD
• Effective Date: TBD

Sections Affected

California Code of Regulations: Title 22 Sections: 64415, 64431, 64432, 64447.2, 64465, and 64481.