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Section 8 | Water Shortage Contingency Plan
8.1 Overview of Water Shortage Contingency Plan
The CWC Section 10632 requires every urban water supplier prepare and adopt a Water Shortage Contingency Plan (WSCP) as part of its UWMP. The IRWD WSCP was first written and adopted in 1987 to provide guidance on implementing actions to reduce water demands in the event of a water shortage. Since then, IRWD’s WSCP has been revised several times. The most recent update was the 2020 WSCP, which built upon the 2018 WSCP and incorporated the lessons learned during the 2012-2016 California drought, as well as elements of the state’s Making Water Conservation a California Way of Life regulation. Changes in this 2025 WSCP update include addressing the finalized elements of the regulation and Water Shortage Contingency Rates that were adopted by IRWD in 2021. IRWD’s WSCP provides procedures for responding to various levels of supply shortages through a combination of supply augmentation and demand management measures. The use of local supplies, storage and other supply augmentation measures can mitigate shortages, and are used as necessary and appropriate during declared shortage levels. IRWD can also employ a range of demand management measures (DMM) that may vary depending on the level and duration of the shortage condition (also see UWMP Section 9). The WSCP defines a list of voluntary measures, non-rate response measures, and potential rate response measures for each level of shortage. While these measures are generally intended to be applied incrementally, the 2025 WSCP continues with the same level of flexibility included in the previous updates which enables the adoption of additional measures to ensure the appropriate level of demand reduction. IRWD maintains the flexibility to amend the WSCP periodically and independently of its UWMP. The following information is meant to serve as a summary only. For additional details and the full WSCP, see Appendix E.
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IRWD – 2025 Urban Water Management Plan
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