Senior Management

IRWD was established in 1961 as a California Water District under the provisions of the state of California Water Code. As a special district, IRWD is able to focus on its four primary services - providing high-quality potable water, sewage collection and treatment, production and delivery of tertiary-treated recycled water, and urban runoff treatment. As an independent, not-for-profit public agency, IRWD is governed by a five-member publicly elected Board of Directors. Board members are elected at-large for four-year terms. The Board is responsible for the District's policies and decision-making. Day-to-day operations are supervised by the General Manager and implemented by staff.

Functional Org Chart

 IRWD General Manager

IRWD General Manager

Paul Cook

Paul A. Cook is the General Manager of Irvine Ranch Water District. As General Manager, Mr. Cook is responsible for all aspects of day-to-day District operations including a staff of approximately 400 employees and a combined annual Operating and Capital Budget of over $260 million.

During his tenure as General Manager, IRWD continues its long-standing commitment to water supply reliability, sustainability and innovation with capital projects that include the largest project in IRWD’s history, the Biosolids and Energy Recovery Facilities Project. IRWD has expanded the production and use of recycled water, and added to its water supply portfolio with new local wells and water treatment facilities. IRWD has increased its access to water supplies under emergency conditions through an innovative water banking program and diversified its energy portfolio by expanding its renewable energy sources and installing one of the largest battery storage systems in the country. Customer rates continue to be among the lowest in Orange County while satisfaction levels among IRWD’s over 400,000 customers remains very high.

Mr. Cook is a registered civil engineer with more than 22 years of experience in water and wastewater system projects in both the public and private sectors. Previous to his appointment as General Manager, Mr. Cook was the IRWD Assistant General Manager. Prior to joining IRWD, he served as the Manager of Engineering for Central and West Basin Municipal Water Districts in Los Angeles County where he was responsible for a $350 million, five-year capital improvements program. Mr. Cook began his career in public service as the District Engineer for Los Alisos Water District, spending five years in the private sector working in the construction industry.

Mr. Cook received his Bachelor of Science degree in civil engineering from University of Pacific in Stockton, CA. He went on to earn a Master of Science degree in civil engineering from California State University Long Beach and an MBA degree from the University of California at Irvine. In 2002 he was elected to the Board of the Orange County Water District where he served through 2005, including a term as Vice President. Cook serves on the Board of the WateReuse Association and is currently the Chair of the Board of Governors for Chapman University in the city of Orange, California.

Contact:  949-453-5300
Email Paul Cook

 IRWD Senior Staff


General Manager
Executive Director, Engineering & Water Quality
Executive Director, Finance and Administration
Executive Director, Operations
Executive Director, Water Policy
Director of Administrative Services
Director of Human Resources       
Director of Maintenance Operations
Director of Public Affairs
Director of Recycling Operations
Director of Treasury & Risk Management
Director of Water Operations
Director of Water Quality & Regulatory Compliance
Director of Water Resources


Paul A. Cook
Kevin Burton
Cheryl Clary
Wendy Chambers
Paul Weghorst
Tony Mossbarger
Jenny Roney
Rick Mykitta
Beth Beeman
Jose Zepeda
Robert Jacobson
Tom Roberts
James Colston
Fiona Sanchez