CASCADE WATER ALLIANCE Request for Proposal White River-Lake Tapps Reservoir Project Operations and Maintenance Agreement Submittal Deadline: May 15, 2026, at 5 PM (PST) Cascade Water Alliance ("Cascade") is soliciting proposals for a multi-year contract for operations and maintenance services (the "Contract Services") for Cascade's White River-Lake Tapps Reservoir Project (the "Project"). Proposers must demonstrate experience and satisfactory performance with engagements of similar scope to the Contract Services, including with respect to the proposed Key Personnel. This Request for Proposal (this "RFP") is being issued to assure that Cascade obtains the services of a qualified firm in the most effective and efficient manner. Cascade intends to select one qualified firm (the "Company") based on this RFP process to operate and maintain the Project's infrastructure to meet regulatory and stakeholder requirements and provide preventive maintenance to ensure the Project remains in sound operating condition on a cost-effective and cooperative basis (the "Cascade Goals"). The Proposer ultimately selected pursuant to this RFP will be a full-service operations and maintenance contractor required to provide all Contract Services, including all required staffing. About Cascade: Cascade is a municipal corporation organized under the authority of the Joint Municipal Utilities Services Act, Chapter 39.106 of the Revised Code of Washington to provide wholesale water supply to meet the current and future water supply needs of its Members. Obtaining the RFP: The RFP, including submittal requirements, evaluation criteria, and background information, is available on Cascade's website at cascadewater.org. Optional Pre-Submission Meeting & Tour: An optional pre-submission meeting and tour of the White River Lake Tapps Project will be conducted on Wednesday March 25, 2025. RSVP for tour attendance, per instruction in the RFP, requested not later than 5 PM (PST) Tuesday March 10, 2026. Submittal Deadline: SOQs must be submitted to Cascade Water Alliance, per instructions in the RFP, no later than 5 PM (PST) on Friday, May 15, 2026. Questions: All questions or requests for clarification must be made only to Dave Roberts, White River Lake Tapps Program Director, by email at droberts@cascadewater.org. IPL0318414 Mar 2 2026