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
- 2025 Annual Water Use Reports – Deadline Update
The deadline to submit 2025 Annual Water Use Reports is Saturday, January 31, 2026.
If you are still completing your report or working with staff to access your information in the CalWATRS system, continue submitting your report even if it is after the deadline. A 30-day grace period is available, and reports may be submitted through March 2, 2026 without penalty.
- Advisory for Water Use Reporters in the Legal Delta
If you are reporting water use in the Legal Delta, please note that the OpenET portal and reporting on diversion and use is now available (effective December 1), so that you can begin reporting in the new CalWATRS system.
- On December 12, 2025, the State Water Board released a new Chapter 13 of the draft Staff Report for a limited recirculation.
