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Section 2 | Plan Preparation
2.1 Basis for Preparing a Plan
Law 10617 “Urban water supplier” means a water supplier, either publicly or privately owned, providing water for municipal purposes either directly or indirectly to more than more than 3,000 customers or supplying more than 3,000 acre-feet of water annually. An urban water supplier includes a supplier or contractor for water, regardless of the basis of right, which distributes or sells for ultimate resale to customers. 10621(a) Each urban water supplier shall update its plan at least once every five years on or before July 1, in years ending in six and one, incorporating updated and new information from the five years preceding each update. In accordance with the California Water Code (CWC), IRWD is an urban water supplier with 3,000 or more service connections and is required by the Act to prepare an UWMP every five years. Several legislative amendments have been made to the CWC since the 2020 UWMP and this 2025 UWMP incorporates all of the new requirements accordingly.
2.2 Public Water Systems
IRWD is considered an urban retail water supplier for the purposes of submitting an UWMP. IRWD includes only one public water system regulated by the State Water Resources Control Board (SWRCB), Division of Drinking Water. DWR Table 2-1 provides information required by DWR regarding public water systems with respect to IRWD. Table 2- 1. DWR Submittal Table Retail: Public Water Systems
Submittal Table 2-1 Retail: Public Water Systems
Public Water System Number
Public Water System Name
Number of Municipal Connections 2025
Volume of Water Supplied 2025 (AF)
Add additional rows as needed CA3010092
Irvine Ranch Water District
132,347
84,438
Total 84,438 NOTES: Volume of water supplied is determined by the end of year water consumption for FY 2024-25 including potable, recycled, and untreated water for all account types. Only active connections are included. 132,347
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IRWD – 2025 Urban Water Management Plan
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