CWS Board thanks Diane Taniguchi-Dennis for her service and assures ratepayers, organizational partners, employees, and community of continuity of operations
Washington County, Oregon— The Clean Water Services Board of Directors announces the resignation of Chief Executive Officer Diane Taniguchi-Dennis and thanks her for her service. On Wednesday, May 7, Taniguchi-Dennis shared with the Board her decision to step down from the role she has served in since 2018.
Taniguchi-Dennis, an engineer, joined CWS in 2011 as the deputy general manager. After a national search, she was promoted to CEO in September 2018. She is an internationally recognized water leader with over 40 years of experience in the field. Her most recent industry leadership roles included serving as president of the National Association of Clean Water Agencies, chair of the Research Advisory Council for the Water Research Foundation, and as a member of the boards of Willamette Partnership and WateReuse. Her last day with CWS will be June 6, 2025. The Board of Directors will announce plans for interim leadership and a national recruitment in the coming weeks.
The Board expresses their gratitude to Taniguchi-Dennis for her long service to the region, ratepayers, and the Tualatin River. They wish her well and are committed to supporting the operational success of Clean Water Services and its employees without interruption.
Clean Water Services is a county service district organized under Oregon Revised Statute 451. CWS works with Washington County and 12 partner cities to provide sewer and stormwater services in the urban areas of the Tualatin River Watershed to more than 610,000 customers and businesses. The conveyance and treatment of wastewater by CWS produces billions of gallons of clean water that are returned to the sensitive Tualatin River. CWS employs more than 450 people, who are committed to successful, uninterrupted operations 24 hours a day, 7 days a week, 365 days a year that protect public health and the environment. The CWS Board of Directors is made up of elected officials who also serve as Washington County Commissioners.
