For City Council Meeting enter May 12, 2026
TO: Honorable Mayor and City Council
FROM: Tanya Williams, City Manager
AUTHOR: Nicole Hemmans, Senior Administrative Analyst
Title
Request City Council/Rialto Utility Authority Board to Set a Public Hearing for June 23, 2026, to Consider Adopting the 2025 Upper Santa Ana River Integrated Regional Urban Water Management Plan, Comprised of the Urban Water Management and the Water Shortage Contingency Plans.
Body
RECOMMENDATION
Staff recommends that the City Council/Rialto Utility Authority Board set a Public Hearing for June 23, 2026, to consider adopting the 2025 Upper Santa Ana River Integrated Regional Urban Water Management Plan, comprised of the Urban Water Management and the Water Shortage Contingency Plans.
BACKGROUND
California Water Code Section 10621(a) requires urban water suppliers to update their Urban Water Management Plan (UWMP) at least once every five (5) years, with the 2025 UWMP due to the California Department of Water Resources (DWR) by July 1, 2026.
City of Rialto participated in a regional UWMP effort led by San Bernardino Valley in coordination with multiple regional water agencies. This regional approach allows participating agencies to streamline costs, share data, and ensure consistency across water supply planning efforts.
Water Systems Consulting, Inc. (WSC) was selected through a regional Request for Proposals (RFP) process to prepare the 2025 UWMP.
Since that time, staff and the consultant team have worked collaboratively to complete the required updates, incorporating current water supply data, demand projections, regulatory requirements, and long-term planning assumptions.
ANALYSIS/DISCUSSION
The Final 2025 UWMP has now been completed and includes updated information related to:
? Water supply reliability under normal, single-dry, and multiple-dry year scenarios
? Water demand projections and population growth assumptions
? Water shortage contingency planning
? System reli...
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