Draft 2025 Urban Water Management Plan

2.5 Coordination and Outreach

IRWD prepared the 2025 UWMP in coordination with regional agencies, water district partners, cities served by IRWD, the county and relevant stakeholders as indicated. Coordination with Wholesale Agencies

Law

10631(h) An urban water supplier that relies upon a wholesale agency for a source of water shall provide the wholesale agency with water use projections from that agency for that source of water in five-year increments to 20 years or as far as data is available. The wholesale agency shall provide information to the urban water supplier for inclusion in the urban water supplier’s plan that identifies and quantifies, to the extent practicable, the existing and planned sources of water as required by subdivision (b), available from the wholesale agency to the urban water supplier over the same five-year increments, and during various water-year types in accordance with subdivision(f). An urban water supplier may rely upon water supply information provided by the wholesale agency in fulfilling the plan informational requirements of subdivisions (b) and (f). IRWD is the largest retail member agency of MWDOC in terms of service area and overall water use. MWDOC is a wholesale importer of water from Metropolitan. MWDOC serves all of Orange County except for the cities of Anaheim, Fullerton and Santa Ana. IRWD coordinated the development of the 2025 UWMP with MWDOC including sharing data, discussing regional UWMP updates, and verifying consistent and accurate exchange of information. DWR Table 2- 4 identifies MWDOC as IRWD’s wholesale water supplier. Table 2- 4. DWR Submittal Table Retail: Water Supplier Information Exchange

Submittal Table 2-4 Retail: Water Supplier Information Exchange Water Code Section 10631(h) The retail Supplier has informed the following wholesale supplier(s) of projected water use. Wholesale Water Supplier Name Municipal Water District of Orange County

IRWD provided MWDOC with its water use projections for imported water supply in five-year increments for the next 20 years. MWDOC incorporated IRWD’s water use projections in its information provided to Metropolitan, the regional wholesaler, of which MWDOC is a member agency. Also, in accordance with 10631(h), for this 2025 UWMP, IRWD relies on the supply information provided in the MWDOC and Metropolitan UWMPs that identifies and quantifies the existing and planned sources of water available to IRWD over the same five-year increments, and during various water-year types in accordance with 10631(f).

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IRWD – 2025 Urban Water Management Plan

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