CASCADE WATER ALLIANCE Request for Expressions of Interest for White River Lake Tapps Contract Operations and Maintenance Submittal Deadline: September 26, 2025, at 5PM Cascade Water Alliance (Cascade) is issuing this Request for Expressions of Interest (RFEI) to firms (Respondents) potentially interested in providing contracted operations and maintenance (O&M) services for Cascade's White River - Lake Tapps Reservoir Project (WRLTR or Project). Cascade is requesting industry feedback, insight, and knowledge to better inform the future Request for Proposals (RFP) that Cascade intends to issue to solicit proposals for a potential multi-year O&M contract (Contract) with Cascade for the WRTLR. Although this RFEI is not a solicitation or the commencement of a procurement for the Contract, Cascade desires to share information, gain insight, and generate interest in the potential Contract. This RFEI creates no obligation on the part of Cascade, and no response to this RFEI (Response) will be binding on the Respondents. About Cascade: Cascade is a municipal corporation that provides wholesale water supply to meet the current and future water supply needs of its members. In addition to serving as a regional water purveyor using Member sources and wholesale water supply agreements, Cascade owns, operates, and maintains infrastructure and real property assets, including the WRLTR Project. Obtaining the RFEI: The RFEI, including submittal information and background information, is available on Cascade's website at cascadewater.org. Submittal Deadline: RFEIs must be submitted to Cascade, per instructions in the RFEI, no later than 5PM on Friday, September 26, 2025. Questions: Dave Roberts, Program Director, is Cascade's single point of contact regarding this RFEI. Please submit inquiries via email to droberts@cascadewater.org at least four business days before the Submittal Deadline. IPL0266962 Sep 2 2025