April 30, 2026
2025 Regional Urban
Water Management Plan
City of Rialto
Public Hearing Items
2 • 2025 Regional Urban Water Management Plan (2025 RUWMP) • Evaluates the City’s and the Region’s near-term and long-tern water service reliability under various hydrologic scenarios
• Demonstrates conservation efforts and outcomes
• Meets the City’s reporting requirements under the UWMP Act • Water Shortage Contingency Plan (WSCP)
• Describes the City’s planned actions to prevent or respond to actual water shortage conditions, if they occur
Background
3 • The California Water Code requires urban water suppliers to prepare and adopt Urban Water Management Plans (UWMPs) for submission to the California Department of Water Resources (DWR)
• UWMPs are required every five years and must satisfy the requirements of the UWMP Act.
• The UWMP Act requires urban water suppliers serving 3,000 or more connections or supplying more than 3,000 acre-feet (AF) of water each year, to complete a UWMP. • Water suppliers within a region may work together to develop a cooperative Regional UWMP (RUWMP), which the Region has done since 2010
2025 RUWMP
Plan Components
4 Part 1: Regional Context
Executive Summary
1 Introduction
2 Region Description
3 Regional Water Sources
and Management
4 Regional Water Use
5 Comparison of Regional
Supplies and Demands
Part 2: Individual Agency
UWMPs
1 San Bernardino Valley
Municipal Water District
2 City of Colton
3 City of Loma Linda
4 City of Redlands
5 City of Rialto
6 Riverside Highland Water
Company
7 San Bernardino Municipal
Water Department
8 South Mesa Water Company
9 West Valley Water District
Part 3: Regional
Supporting Information
Regional supporting
documentation referenced in
Part 1, including:
•Agreements
Part 4: Local Agency
Supporting Information
A San Bernardino Valley
Municipal Water District
B City of Colton
C City of Loma Linda
D City of Redlands
E City of Rialto
F Riverside Highland Water
Company
G San Bernardino Municipal
Water Department
H South Mesa Water
Company
I West Valley Water District
For Adoption by the
City:
• Part 1
• Part 2, Chapter 5
• Part 3
• Part 4, Appendix E
Includes Water
Shortage
Contingency
Plan (WSCP)
2025 RUWMP
2025 UWMP Chapter Conclusions
5 • The City has long-term water service reliability under Normal Year, Single Dry Year, and Five consecutive drought years
• The City has sufficient near-term supply reliability for a drought period lasting five consecutive years
• The City’s ongoing participation in collaborative regional water resources planning process is key to meeting the City’s future water supply needs
CITY OF RIALTO