2025 Urban Water Management Plan Update

Sonoma Water is a wholesaler of potable water, serving nine primary municipal customers in Sonoma and Marin Counties.  In accordance with the Urban Water Management Planning Act (California Water Code §10608-10657) Sonoma Water is updating its Urban Water Management Plan (UWMP) and associated Water Shortage Contingency Plan (WSCP) for 2025 in coordination with community stakeholders and its retail water contractors.

Sonoma Water’s updated UWMP will discuss and describe the following:

• Existing water supplies and transmission system facilities
• Projected water demands in Sonoma Water’s service area over the next 25 years
• Projected water supplies available to Sonoma Water over the next 25 years, the reliability of that supply, and general schedules for water supply projects
• Climate change impacts to water supply
• Energy intensity
• Current and planned water conservation activities by Sonoma Water
• An updated and separately adopted Water Shortage Contingency Plan
• A comparison of water supply and water demand over the next 25 years under different hydrological assumptions (normal year, single dry year, multiple dry years)

Schedule for preparation and approval of the Plan:

• Coordinate with water retailers, city planners, and other external stakeholders: Through April 2026
• Complete Draft Urban Water Management Plan: April 2026
• Hold public hearing: May 12, 2026 at 10:10 a.m. (Link to meeting information (https://sonoma-county.legistar.com/Calendar.aspx))
• Board of Directors Adopt UWMP and WSCP: May 12, 2026 (Planned, Link to meeting information (https://sonoma-county.legistar.com/Calendar.aspx))
• Submit Final Plan to DWR: By July 1, 2026

Documents

• Final 2020 Urban Water Management Plan and Water Shortage Contingency Plan    (Errata Sheet)
• Final 2015 Urban Water Management Plan (PDF)
• Final 2010 Urban Water Management Plan (PDF)
• Final 2005 Urban Water Management Plan (PDF)

Resources:

• Department of Water Resources - Urban Water Management Plan
• Department of Water Resources - Guidebook to Assist Water Suppliers in the Preparation of an Urban Water Management Plan (Published February 6, 2026)

Contact Information

Comments or questions regarding the UWMP update may be addressed to:

Paul Piazza
UWMP Project Manager
Phone: 707-547-1900 or paul.piazza@scwa.ca.gov