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The California State Lands Commission is now implementing an emergency ballast water management rule that amends Article 4.7 of Chapter 1, Division 3 of Title 2 of the California Code of Regulations. The emergency rule became effective on June 18, 2025.
This emergency rule requires vessels with ballast water sourced from waters with a measured salinity of less than 18 parts per thousand (ppt; i.e., 18 grams of salt per kilogram of water) to conduct ballast water exchange prior to discharging at California’s fresh and brackish water. This requirement is in addition to meeting existing California ballast water discharge performance standards (Performance Standards; Title 2, Cal. Code Regs. Section 2293).
The Commission's Marine Invasive Species Program provided information about the emergency rule during a webinar on July 25, 2025. More information about the emergency rule is available on the Commission’s website.
For questions, please contact MISP.public@slc.ca.gov
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About the Commission: The Commission, comprised of the Lieutenant Governor, State Controller, and Governor’s Director of Finance, manages over 4 million acres of tide and submerged lands and the beds of navigable waterways. The Commission administers the state’s coastal hazard and legacy well removal and remediation program, and regulates marine oil terminals to prevent oil spills and large oceangoing vessels to prevent nonindigenous species introductions. The Commission is a leader in the fight against climate change and transitioning away from fossil fuel to clean energy, managing a portfolio of renewable energy leases and working to bring offshore wind energy to California. |
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