Office of Delta Watermaster
The Office of the Delta Watermaster was created as part of the Delta Reform Act of 2009. The Watermaster is an independent officer of the State, appointed to a four-year term by the State Water Resources Control Board, reporting jointly to the Water Board and to the Delta Stewardship Council.
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Contacts
Tel: (916) 319-8264
E-mail: deltawatermaster@waterboards.ca.gov
Recent Delta Watermaster Notices & Announcements
- Advisory for Water Use Reporters in the Legal Delta
If you are reporting water use in the Legal Delta, please note that you will not be able to begin reporting in CalWATRS, until mid-November 2025.
The State Water Board is planning a series of public events to help users navigate CalWATRS. Upcoming events will be posted on the CalWATRS webpage as they are scheduled.
If you have questions or would like the CalWATRS team to attend an event in your area, please email deltawatermaster@waterboards.ca.gov.
For the latest updates, visit the CalWATRS webpage.
- 2025-09-08 MSS Report Response Letter
- Update for 2024 In-Delta Water Rights Reporting
Water Year 2024 reports and are now past due. If you report through the DeltaACP.com platform, please note the extended filing deadline was April 1, 2025. For questions regarding this update, contact the Office of the Delta Watermaster, deltawatermaster@waterboards.ca.gov.
